diff mbox series

[-rcu/kcsan,16/23] locking/atomics, kcsan: Add instrumentation for barriers

Message ID 20211005105905.1994700-17-elver@google.com (mailing list archive)
State New
Headers show
Series kcsan: Support detecting a subset of missing memory barriers | expand

Commit Message

Marco Elver Oct. 5, 2021, 10:58 a.m. UTC 
Adds the required KCSAN instrumentation for barriers of atomics.

Signed-off-by: Marco Elver <elver@google.com>
---
 include/linux/atomic/atomic-instrumented.h | 135 ++++++++++++++++++++-
 scripts/atomic/gen-atomic-instrumented.sh  |  41 +++++--
 2 files changed, 166 insertions(+), 10 deletions(-)

Comments

Peter Zijlstra Oct. 5, 2021, 12:02 p.m. UTC | #1 
On Tue, Oct 05, 2021 at 12:58:58PM +0200, Marco Elver wrote:
> @@ -59,6 +60,7 @@ atomic_add(int i, atomic_t *v)
>  static __always_inline int
>  atomic_add_return(int i, atomic_t *v)
>  {
> +	kcsan_mb();
>  	instrument_atomic_read_write(v, sizeof(*v));
>  	return arch_atomic_add_return(i, v);
>  }

This and others,.. is this actually correct? Should that not be
something like:

	kscan_mb();
	instrument_atomic_read_write(...);
	ret = arch_atomic_add_return(i, v);
	kcsan_mb();
	return ret;

?
Marco Elver Oct. 5, 2021, 12:16 p.m. UTC | #2 
On Tue, 5 Oct 2021 at 14:03, Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Tue, Oct 05, 2021 at 12:58:58PM +0200, Marco Elver wrote:
> > @@ -59,6 +60,7 @@ atomic_add(int i, atomic_t *v)
> >  static __always_inline int
> >  atomic_add_return(int i, atomic_t *v)
> >  {
> > +     kcsan_mb();
> >       instrument_atomic_read_write(v, sizeof(*v));
> >       return arch_atomic_add_return(i, v);
> >  }
>
> This and others,.. is this actually correct? Should that not be
> something like:
>
>         kscan_mb();
>         instrument_atomic_read_write(...);
>         ret = arch_atomic_add_return(i, v);
>         kcsan_mb();
>         return ret;
>
> ?

In theory, yes, but right now it's redundant.

Because right now KCSAN only models "buffering", and no "prefetching".
So there's no way that a later instruction would be reordered before
this point. And atomic accesses are never considered for reordering,
so it's also impossible that it would  be reordered later.

Each kcsan_mb() is a call, so right now it makes sense to just have 1
call to be a bit more efficient.
diff mbox series

Patch

diff --git a/include/linux/atomic/atomic-instrumented.h b/include/linux/atomic/atomic-instrumented.h
index a0f654370da3..5d69b143c28e 100644
--- a/include/linux/atomic/atomic-instrumented.h
+++ b/include/linux/atomic/atomic-instrumented.h
@@ -45,6 +45,7 @@  atomic_set(atomic_t *v, int i)
 static __always_inline void
 atomic_set_release(atomic_t *v, int i)
 {
+	kcsan_release();
 	instrument_atomic_write(v, sizeof(*v));
 	arch_atomic_set_release(v, i);
 }
@@ -59,6 +60,7 @@  atomic_add(int i, atomic_t *v)
 static __always_inline int
 atomic_add_return(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_add_return(i, v);
 }
@@ -73,6 +75,7 @@  atomic_add_return_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_add_return_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_add_return_release(i, v);
 }
@@ -87,6 +90,7 @@  atomic_add_return_relaxed(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_add(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_add(i, v);
 }
@@ -101,6 +105,7 @@  atomic_fetch_add_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_add_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_add_release(i, v);
 }
@@ -122,6 +127,7 @@  atomic_sub(int i, atomic_t *v)
 static __always_inline int
 atomic_sub_return(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_sub_return(i, v);
 }
@@ -136,6 +142,7 @@  atomic_sub_return_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_sub_return_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_sub_return_release(i, v);
 }
@@ -150,6 +157,7 @@  atomic_sub_return_relaxed(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_sub(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_sub(i, v);
 }
@@ -164,6 +172,7 @@  atomic_fetch_sub_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_sub_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_sub_release(i, v);
 }
@@ -185,6 +194,7 @@  atomic_inc(atomic_t *v)
 static __always_inline int
 atomic_inc_return(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_inc_return(v);
 }
@@ -199,6 +209,7 @@  atomic_inc_return_acquire(atomic_t *v)
 static __always_inline int
 atomic_inc_return_release(atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_inc_return_release(v);
 }
@@ -213,6 +224,7 @@  atomic_inc_return_relaxed(atomic_t *v)
 static __always_inline int
 atomic_fetch_inc(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_inc(v);
 }
@@ -227,6 +239,7 @@  atomic_fetch_inc_acquire(atomic_t *v)
 static __always_inline int
 atomic_fetch_inc_release(atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_inc_release(v);
 }
@@ -248,6 +261,7 @@  atomic_dec(atomic_t *v)
 static __always_inline int
 atomic_dec_return(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_dec_return(v);
 }
@@ -262,6 +276,7 @@  atomic_dec_return_acquire(atomic_t *v)
 static __always_inline int
 atomic_dec_return_release(atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_dec_return_release(v);
 }
@@ -276,6 +291,7 @@  atomic_dec_return_relaxed(atomic_t *v)
 static __always_inline int
 atomic_fetch_dec(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_dec(v);
 }
@@ -290,6 +306,7 @@  atomic_fetch_dec_acquire(atomic_t *v)
 static __always_inline int
 atomic_fetch_dec_release(atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_dec_release(v);
 }
@@ -311,6 +328,7 @@  atomic_and(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_and(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_and(i, v);
 }
@@ -325,6 +343,7 @@  atomic_fetch_and_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_and_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_and_release(i, v);
 }
@@ -346,6 +365,7 @@  atomic_andnot(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_andnot(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_andnot(i, v);
 }
@@ -360,6 +380,7 @@  atomic_fetch_andnot_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_andnot_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_andnot_release(i, v);
 }
@@ -381,6 +402,7 @@  atomic_or(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_or(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_or(i, v);
 }
@@ -395,6 +417,7 @@  atomic_fetch_or_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_or_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_or_release(i, v);
 }
@@ -416,6 +439,7 @@  atomic_xor(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_xor(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_xor(i, v);
 }
@@ -430,6 +454,7 @@  atomic_fetch_xor_acquire(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_xor_release(int i, atomic_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_xor_release(i, v);
 }
@@ -444,6 +469,7 @@  atomic_fetch_xor_relaxed(int i, atomic_t *v)
 static __always_inline int
 atomic_xchg(atomic_t *v, int i)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_xchg(v, i);
 }
@@ -458,6 +484,7 @@  atomic_xchg_acquire(atomic_t *v, int i)
 static __always_inline int
 atomic_xchg_release(atomic_t *v, int i)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_xchg_release(v, i);
 }
@@ -472,6 +499,7 @@  atomic_xchg_relaxed(atomic_t *v, int i)
 static __always_inline int
 atomic_cmpxchg(atomic_t *v, int old, int new)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_cmpxchg(v, old, new);
 }
@@ -486,6 +514,7 @@  atomic_cmpxchg_acquire(atomic_t *v, int old, int new)
 static __always_inline int
 atomic_cmpxchg_release(atomic_t *v, int old, int new)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_cmpxchg_release(v, old, new);
 }
@@ -500,6 +529,7 @@  atomic_cmpxchg_relaxed(atomic_t *v, int old, int new)
 static __always_inline bool
 atomic_try_cmpxchg(atomic_t *v, int *old, int new)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	instrument_atomic_read_write(old, sizeof(*old));
 	return arch_atomic_try_cmpxchg(v, old, new);
@@ -516,6 +546,7 @@  atomic_try_cmpxchg_acquire(atomic_t *v, int *old, int new)
 static __always_inline bool
 atomic_try_cmpxchg_release(atomic_t *v, int *old, int new)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	instrument_atomic_read_write(old, sizeof(*old));
 	return arch_atomic_try_cmpxchg_release(v, old, new);
@@ -532,6 +563,7 @@  atomic_try_cmpxchg_relaxed(atomic_t *v, int *old, int new)
 static __always_inline bool
 atomic_sub_and_test(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_sub_and_test(i, v);
 }
@@ -539,6 +571,7 @@  atomic_sub_and_test(int i, atomic_t *v)
 static __always_inline bool
 atomic_dec_and_test(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_dec_and_test(v);
 }
@@ -546,6 +579,7 @@  atomic_dec_and_test(atomic_t *v)
 static __always_inline bool
 atomic_inc_and_test(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_inc_and_test(v);
 }
@@ -553,6 +587,7 @@  atomic_inc_and_test(atomic_t *v)
 static __always_inline bool
 atomic_add_negative(int i, atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_add_negative(i, v);
 }
@@ -560,6 +595,7 @@  atomic_add_negative(int i, atomic_t *v)
 static __always_inline int
 atomic_fetch_add_unless(atomic_t *v, int a, int u)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_fetch_add_unless(v, a, u);
 }
@@ -567,6 +603,7 @@  atomic_fetch_add_unless(atomic_t *v, int a, int u)
 static __always_inline bool
 atomic_add_unless(atomic_t *v, int a, int u)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_add_unless(v, a, u);
 }
@@ -574,6 +611,7 @@  atomic_add_unless(atomic_t *v, int a, int u)
 static __always_inline bool
 atomic_inc_not_zero(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_inc_not_zero(v);
 }
@@ -581,6 +619,7 @@  atomic_inc_not_zero(atomic_t *v)
 static __always_inline bool
 atomic_inc_unless_negative(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_inc_unless_negative(v);
 }
@@ -588,6 +627,7 @@  atomic_inc_unless_negative(atomic_t *v)
 static __always_inline bool
 atomic_dec_unless_positive(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_dec_unless_positive(v);
 }
@@ -595,6 +635,7 @@  atomic_dec_unless_positive(atomic_t *v)
 static __always_inline int
 atomic_dec_if_positive(atomic_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_dec_if_positive(v);
 }
@@ -623,6 +664,7 @@  atomic64_set(atomic64_t *v, s64 i)
 static __always_inline void
 atomic64_set_release(atomic64_t *v, s64 i)
 {
+	kcsan_release();
 	instrument_atomic_write(v, sizeof(*v));
 	arch_atomic64_set_release(v, i);
 }
@@ -637,6 +679,7 @@  atomic64_add(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_add_return(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_add_return(i, v);
 }
@@ -651,6 +694,7 @@  atomic64_add_return_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_add_return_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_add_return_release(i, v);
 }
@@ -665,6 +709,7 @@  atomic64_add_return_relaxed(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_add(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_add(i, v);
 }
@@ -679,6 +724,7 @@  atomic64_fetch_add_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_add_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_add_release(i, v);
 }
@@ -700,6 +746,7 @@  atomic64_sub(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_sub_return(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_sub_return(i, v);
 }
@@ -714,6 +761,7 @@  atomic64_sub_return_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_sub_return_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_sub_return_release(i, v);
 }
@@ -728,6 +776,7 @@  atomic64_sub_return_relaxed(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_sub(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_sub(i, v);
 }
@@ -742,6 +791,7 @@  atomic64_fetch_sub_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_sub_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_sub_release(i, v);
 }
@@ -763,6 +813,7 @@  atomic64_inc(atomic64_t *v)
 static __always_inline s64
 atomic64_inc_return(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_inc_return(v);
 }
@@ -777,6 +828,7 @@  atomic64_inc_return_acquire(atomic64_t *v)
 static __always_inline s64
 atomic64_inc_return_release(atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_inc_return_release(v);
 }
@@ -791,6 +843,7 @@  atomic64_inc_return_relaxed(atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_inc(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_inc(v);
 }
@@ -805,6 +858,7 @@  atomic64_fetch_inc_acquire(atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_inc_release(atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_inc_release(v);
 }
@@ -826,6 +880,7 @@  atomic64_dec(atomic64_t *v)
 static __always_inline s64
 atomic64_dec_return(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_dec_return(v);
 }
@@ -840,6 +895,7 @@  atomic64_dec_return_acquire(atomic64_t *v)
 static __always_inline s64
 atomic64_dec_return_release(atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_dec_return_release(v);
 }
@@ -854,6 +910,7 @@  atomic64_dec_return_relaxed(atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_dec(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_dec(v);
 }
@@ -868,6 +925,7 @@  atomic64_fetch_dec_acquire(atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_dec_release(atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_dec_release(v);
 }
@@ -889,6 +947,7 @@  atomic64_and(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_and(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_and(i, v);
 }
@@ -903,6 +962,7 @@  atomic64_fetch_and_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_and_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_and_release(i, v);
 }
@@ -924,6 +984,7 @@  atomic64_andnot(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_andnot(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_andnot(i, v);
 }
@@ -938,6 +999,7 @@  atomic64_fetch_andnot_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_andnot_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_andnot_release(i, v);
 }
@@ -959,6 +1021,7 @@  atomic64_or(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_or(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_or(i, v);
 }
@@ -973,6 +1036,7 @@  atomic64_fetch_or_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_or_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_or_release(i, v);
 }
@@ -994,6 +1058,7 @@  atomic64_xor(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_xor(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_xor(i, v);
 }
@@ -1008,6 +1073,7 @@  atomic64_fetch_xor_acquire(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_xor_release(s64 i, atomic64_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_xor_release(i, v);
 }
@@ -1022,6 +1088,7 @@  atomic64_fetch_xor_relaxed(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_xchg(atomic64_t *v, s64 i)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_xchg(v, i);
 }
@@ -1036,6 +1103,7 @@  atomic64_xchg_acquire(atomic64_t *v, s64 i)
 static __always_inline s64
 atomic64_xchg_release(atomic64_t *v, s64 i)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_xchg_release(v, i);
 }
@@ -1050,6 +1118,7 @@  atomic64_xchg_relaxed(atomic64_t *v, s64 i)
 static __always_inline s64
 atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_cmpxchg(v, old, new);
 }
@@ -1064,6 +1133,7 @@  atomic64_cmpxchg_acquire(atomic64_t *v, s64 old, s64 new)
 static __always_inline s64
 atomic64_cmpxchg_release(atomic64_t *v, s64 old, s64 new)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_cmpxchg_release(v, old, new);
 }
@@ -1078,6 +1148,7 @@  atomic64_cmpxchg_relaxed(atomic64_t *v, s64 old, s64 new)
 static __always_inline bool
 atomic64_try_cmpxchg(atomic64_t *v, s64 *old, s64 new)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	instrument_atomic_read_write(old, sizeof(*old));
 	return arch_atomic64_try_cmpxchg(v, old, new);
@@ -1094,6 +1165,7 @@  atomic64_try_cmpxchg_acquire(atomic64_t *v, s64 *old, s64 new)
 static __always_inline bool
 atomic64_try_cmpxchg_release(atomic64_t *v, s64 *old, s64 new)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	instrument_atomic_read_write(old, sizeof(*old));
 	return arch_atomic64_try_cmpxchg_release(v, old, new);
@@ -1110,6 +1182,7 @@  atomic64_try_cmpxchg_relaxed(atomic64_t *v, s64 *old, s64 new)
 static __always_inline bool
 atomic64_sub_and_test(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_sub_and_test(i, v);
 }
@@ -1117,6 +1190,7 @@  atomic64_sub_and_test(s64 i, atomic64_t *v)
 static __always_inline bool
 atomic64_dec_and_test(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_dec_and_test(v);
 }
@@ -1124,6 +1198,7 @@  atomic64_dec_and_test(atomic64_t *v)
 static __always_inline bool
 atomic64_inc_and_test(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_inc_and_test(v);
 }
@@ -1131,6 +1206,7 @@  atomic64_inc_and_test(atomic64_t *v)
 static __always_inline bool
 atomic64_add_negative(s64 i, atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_add_negative(i, v);
 }
@@ -1138,6 +1214,7 @@  atomic64_add_negative(s64 i, atomic64_t *v)
 static __always_inline s64
 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_fetch_add_unless(v, a, u);
 }
@@ -1145,6 +1222,7 @@  atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
 static __always_inline bool
 atomic64_add_unless(atomic64_t *v, s64 a, s64 u)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_add_unless(v, a, u);
 }
@@ -1152,6 +1230,7 @@  atomic64_add_unless(atomic64_t *v, s64 a, s64 u)
 static __always_inline bool
 atomic64_inc_not_zero(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_inc_not_zero(v);
 }
@@ -1159,6 +1238,7 @@  atomic64_inc_not_zero(atomic64_t *v)
 static __always_inline bool
 atomic64_inc_unless_negative(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_inc_unless_negative(v);
 }
@@ -1166,6 +1246,7 @@  atomic64_inc_unless_negative(atomic64_t *v)
 static __always_inline bool
 atomic64_dec_unless_positive(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_dec_unless_positive(v);
 }
@@ -1173,6 +1254,7 @@  atomic64_dec_unless_positive(atomic64_t *v)
 static __always_inline s64
 atomic64_dec_if_positive(atomic64_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic64_dec_if_positive(v);
 }
@@ -1201,6 +1283,7 @@  atomic_long_set(atomic_long_t *v, long i)
 static __always_inline void
 atomic_long_set_release(atomic_long_t *v, long i)
 {
+	kcsan_release();
 	instrument_atomic_write(v, sizeof(*v));
 	arch_atomic_long_set_release(v, i);
 }
@@ -1215,6 +1298,7 @@  atomic_long_add(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_add_return(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_add_return(i, v);
 }
@@ -1229,6 +1313,7 @@  atomic_long_add_return_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_add_return_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_add_return_release(i, v);
 }
@@ -1243,6 +1328,7 @@  atomic_long_add_return_relaxed(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_add(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_add(i, v);
 }
@@ -1257,6 +1343,7 @@  atomic_long_fetch_add_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_add_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_add_release(i, v);
 }
@@ -1278,6 +1365,7 @@  atomic_long_sub(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_sub_return(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_sub_return(i, v);
 }
@@ -1292,6 +1380,7 @@  atomic_long_sub_return_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_sub_return_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_sub_return_release(i, v);
 }
@@ -1306,6 +1395,7 @@  atomic_long_sub_return_relaxed(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_sub(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_sub(i, v);
 }
@@ -1320,6 +1410,7 @@  atomic_long_fetch_sub_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_sub_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_sub_release(i, v);
 }
@@ -1341,6 +1432,7 @@  atomic_long_inc(atomic_long_t *v)
 static __always_inline long
 atomic_long_inc_return(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_inc_return(v);
 }
@@ -1355,6 +1447,7 @@  atomic_long_inc_return_acquire(atomic_long_t *v)
 static __always_inline long
 atomic_long_inc_return_release(atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_inc_return_release(v);
 }
@@ -1369,6 +1462,7 @@  atomic_long_inc_return_relaxed(atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_inc(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_inc(v);
 }
@@ -1383,6 +1477,7 @@  atomic_long_fetch_inc_acquire(atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_inc_release(atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_inc_release(v);
 }
@@ -1404,6 +1499,7 @@  atomic_long_dec(atomic_long_t *v)
 static __always_inline long
 atomic_long_dec_return(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_dec_return(v);
 }
@@ -1418,6 +1514,7 @@  atomic_long_dec_return_acquire(atomic_long_t *v)
 static __always_inline long
 atomic_long_dec_return_release(atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_dec_return_release(v);
 }
@@ -1432,6 +1529,7 @@  atomic_long_dec_return_relaxed(atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_dec(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_dec(v);
 }
@@ -1446,6 +1544,7 @@  atomic_long_fetch_dec_acquire(atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_dec_release(atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_dec_release(v);
 }
@@ -1467,6 +1566,7 @@  atomic_long_and(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_and(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_and(i, v);
 }
@@ -1481,6 +1581,7 @@  atomic_long_fetch_and_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_and_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_and_release(i, v);
 }
@@ -1502,6 +1603,7 @@  atomic_long_andnot(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_andnot(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_andnot(i, v);
 }
@@ -1516,6 +1618,7 @@  atomic_long_fetch_andnot_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_andnot_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_andnot_release(i, v);
 }
@@ -1537,6 +1640,7 @@  atomic_long_or(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_or(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_or(i, v);
 }
@@ -1551,6 +1655,7 @@  atomic_long_fetch_or_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_or_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_or_release(i, v);
 }
@@ -1572,6 +1677,7 @@  atomic_long_xor(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_xor(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_xor(i, v);
 }
@@ -1586,6 +1692,7 @@  atomic_long_fetch_xor_acquire(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_xor_release(long i, atomic_long_t *v)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_xor_release(i, v);
 }
@@ -1600,6 +1707,7 @@  atomic_long_fetch_xor_relaxed(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_xchg(atomic_long_t *v, long i)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_xchg(v, i);
 }
@@ -1614,6 +1722,7 @@  atomic_long_xchg_acquire(atomic_long_t *v, long i)
 static __always_inline long
 atomic_long_xchg_release(atomic_long_t *v, long i)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_xchg_release(v, i);
 }
@@ -1628,6 +1737,7 @@  atomic_long_xchg_relaxed(atomic_long_t *v, long i)
 static __always_inline long
 atomic_long_cmpxchg(atomic_long_t *v, long old, long new)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_cmpxchg(v, old, new);
 }
@@ -1642,6 +1752,7 @@  atomic_long_cmpxchg_acquire(atomic_long_t *v, long old, long new)
 static __always_inline long
 atomic_long_cmpxchg_release(atomic_long_t *v, long old, long new)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_cmpxchg_release(v, old, new);
 }
@@ -1656,6 +1767,7 @@  atomic_long_cmpxchg_relaxed(atomic_long_t *v, long old, long new)
 static __always_inline bool
 atomic_long_try_cmpxchg(atomic_long_t *v, long *old, long new)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	instrument_atomic_read_write(old, sizeof(*old));
 	return arch_atomic_long_try_cmpxchg(v, old, new);
@@ -1672,6 +1784,7 @@  atomic_long_try_cmpxchg_acquire(atomic_long_t *v, long *old, long new)
 static __always_inline bool
 atomic_long_try_cmpxchg_release(atomic_long_t *v, long *old, long new)
 {
+	kcsan_release();
 	instrument_atomic_read_write(v, sizeof(*v));
 	instrument_atomic_read_write(old, sizeof(*old));
 	return arch_atomic_long_try_cmpxchg_release(v, old, new);
@@ -1688,6 +1801,7 @@  atomic_long_try_cmpxchg_relaxed(atomic_long_t *v, long *old, long new)
 static __always_inline bool
 atomic_long_sub_and_test(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_sub_and_test(i, v);
 }
@@ -1695,6 +1809,7 @@  atomic_long_sub_and_test(long i, atomic_long_t *v)
 static __always_inline bool
 atomic_long_dec_and_test(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_dec_and_test(v);
 }
@@ -1702,6 +1817,7 @@  atomic_long_dec_and_test(atomic_long_t *v)
 static __always_inline bool
 atomic_long_inc_and_test(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_inc_and_test(v);
 }
@@ -1709,6 +1825,7 @@  atomic_long_inc_and_test(atomic_long_t *v)
 static __always_inline bool
 atomic_long_add_negative(long i, atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_add_negative(i, v);
 }
@@ -1716,6 +1833,7 @@  atomic_long_add_negative(long i, atomic_long_t *v)
 static __always_inline long
 atomic_long_fetch_add_unless(atomic_long_t *v, long a, long u)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_fetch_add_unless(v, a, u);
 }
@@ -1723,6 +1841,7 @@  atomic_long_fetch_add_unless(atomic_long_t *v, long a, long u)
 static __always_inline bool
 atomic_long_add_unless(atomic_long_t *v, long a, long u)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_add_unless(v, a, u);
 }
@@ -1730,6 +1849,7 @@  atomic_long_add_unless(atomic_long_t *v, long a, long u)
 static __always_inline bool
 atomic_long_inc_not_zero(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_inc_not_zero(v);
 }
@@ -1737,6 +1857,7 @@  atomic_long_inc_not_zero(atomic_long_t *v)
 static __always_inline bool
 atomic_long_inc_unless_negative(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_inc_unless_negative(v);
 }
@@ -1744,6 +1865,7 @@  atomic_long_inc_unless_negative(atomic_long_t *v)
 static __always_inline bool
 atomic_long_dec_unless_positive(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_dec_unless_positive(v);
 }
@@ -1751,6 +1873,7 @@  atomic_long_dec_unless_positive(atomic_long_t *v)
 static __always_inline long
 atomic_long_dec_if_positive(atomic_long_t *v)
 {
+	kcsan_mb();
 	instrument_atomic_read_write(v, sizeof(*v));
 	return arch_atomic_long_dec_if_positive(v);
 }
@@ -1758,6 +1881,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define xchg(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_mb(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	arch_xchg(__ai_ptr, __VA_ARGS__); \
 })
@@ -1772,6 +1896,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define xchg_release(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_release(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	arch_xchg_release(__ai_ptr, __VA_ARGS__); \
 })
@@ -1786,6 +1911,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define cmpxchg(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_mb(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	arch_cmpxchg(__ai_ptr, __VA_ARGS__); \
 })
@@ -1800,6 +1926,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define cmpxchg_release(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_release(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	arch_cmpxchg_release(__ai_ptr, __VA_ARGS__); \
 })
@@ -1814,6 +1941,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define cmpxchg64(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_mb(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	arch_cmpxchg64(__ai_ptr, __VA_ARGS__); \
 })
@@ -1828,6 +1956,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define cmpxchg64_release(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_release(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	arch_cmpxchg64_release(__ai_ptr, __VA_ARGS__); \
 })
@@ -1843,6 +1972,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
 	typeof(oldp) __ai_oldp = (oldp); \
+	kcsan_mb(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
 	arch_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
@@ -1861,6 +1991,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
 	typeof(oldp) __ai_oldp = (oldp); \
+	kcsan_release(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	instrument_atomic_write(__ai_oldp, sizeof(*__ai_oldp)); \
 	arch_try_cmpxchg_release(__ai_ptr, __ai_oldp, __VA_ARGS__); \
@@ -1892,6 +2023,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define sync_cmpxchg(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_mb(); \
 	instrument_atomic_write(__ai_ptr, sizeof(*__ai_ptr)); \
 	arch_sync_cmpxchg(__ai_ptr, __VA_ARGS__); \
 })
@@ -1899,6 +2031,7 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 #define cmpxchg_double(ptr, ...) \
 ({ \
 	typeof(ptr) __ai_ptr = (ptr); \
+	kcsan_mb(); \
 	instrument_atomic_write(__ai_ptr, 2 * sizeof(*__ai_ptr)); \
 	arch_cmpxchg_double(__ai_ptr, __VA_ARGS__); \
 })
@@ -1912,4 +2045,4 @@  atomic_long_dec_if_positive(atomic_long_t *v)
 })
 
 #endif /* _LINUX_ATOMIC_INSTRUMENTED_H */
-// 2a9553f0a9d5619f19151092df5cabbbf16ce835
+// 87c974b93032afd42143613434d1a7788fa598f9
diff --git a/scripts/atomic/gen-atomic-instrumented.sh b/scripts/atomic/gen-atomic-instrumented.sh
index 035ceb4ee85c..68f902731d01 100755
--- a/scripts/atomic/gen-atomic-instrumented.sh
+++ b/scripts/atomic/gen-atomic-instrumented.sh
@@ -34,6 +34,14 @@  gen_param_check()
 gen_params_checks()
 {
 	local meta="$1"; shift
+	local order="$1"; shift
+
+	if [ "${order}" = "_release" ]; then
+		printf "\tkcsan_release();\n"
+	elif [ -z "${order}" ] && ! meta_in "$meta" "slv"; then
+		# RMW with return value is fully ordered
+		printf "\tkcsan_mb();\n"
+	fi
 
 	while [ "$#" -gt 0 ]; do
 		gen_param_check "$meta" "$1"
@@ -56,7 +64,7 @@  gen_proto_order_variant()
 
 	local ret="$(gen_ret_type "${meta}" "${int}")"
 	local params="$(gen_params "${int}" "${atomic}" "$@")"
-	local checks="$(gen_params_checks "${meta}" "$@")"
+	local checks="$(gen_params_checks "${meta}" "${order}" "$@")"
 	local args="$(gen_args "$@")"
 	local retstmt="$(gen_ret_stmt "${meta}")"
 
@@ -75,29 +83,44 @@  EOF
 gen_xchg()
 {
 	local xchg="$1"; shift
+	local order="$1"; shift
 	local mult="$1"; shift
 
+	kcsan_barrier=""
+	if [ "${xchg%_local}" = "${xchg}" ]; then
+		case "$order" in
+		_release)	kcsan_barrier="kcsan_release()" ;;
+		"")			kcsan_barrier="kcsan_mb()" ;;
+		esac
+	fi
+
 	if [ "${xchg%${xchg#try_cmpxchg}}" = "try_cmpxchg" ] ; then
 
 cat <<EOF
-#define ${xchg}(ptr, oldp, ...) \\
+#define ${xchg}${order}(ptr, oldp, ...) \\
 ({ \\
 	typeof(ptr) __ai_ptr = (ptr); \\
 	typeof(oldp) __ai_oldp = (oldp); \\
+EOF
+[ -n "$kcsan_barrier" ] && printf "\t${kcsan_barrier}; \\\\\n"
+cat <<EOF
 	instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
 	instrument_atomic_write(__ai_oldp, ${mult}sizeof(*__ai_oldp)); \\
-	arch_${xchg}(__ai_ptr, __ai_oldp, __VA_ARGS__); \\
+	arch_${xchg}${order}(__ai_ptr, __ai_oldp, __VA_ARGS__); \\
 })
 EOF
 
 	else
 
 cat <<EOF
-#define ${xchg}(ptr, ...) \\
+#define ${xchg}${order}(ptr, ...) \\
 ({ \\
 	typeof(ptr) __ai_ptr = (ptr); \\
+EOF
+[ -n "$kcsan_barrier" ] && printf "\t${kcsan_barrier}; \\\\\n"
+cat <<EOF
 	instrument_atomic_write(__ai_ptr, ${mult}sizeof(*__ai_ptr)); \\
-	arch_${xchg}(__ai_ptr, __VA_ARGS__); \\
+	arch_${xchg}${order}(__ai_ptr, __VA_ARGS__); \\
 })
 EOF
 
@@ -145,21 +168,21 @@  done
 
 for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg"; do
 	for order in "" "_acquire" "_release" "_relaxed"; do
-		gen_xchg "${xchg}${order}" ""
+		gen_xchg "${xchg}" "${order}" ""
 		printf "\n"
 	done
 done
 
 for xchg in "cmpxchg_local" "cmpxchg64_local" "sync_cmpxchg"; do
-	gen_xchg "${xchg}" ""
+	gen_xchg "${xchg}" "" ""
 	printf "\n"
 done
 
-gen_xchg "cmpxchg_double" "2 * "
+gen_xchg "cmpxchg_double" "" "2 * "
 
 printf "\n\n"
 
-gen_xchg "cmpxchg_double_local" "2 * "
+gen_xchg "cmpxchg_double_local" "" "2 * "
 
 cat <<EOF