diff mbox series

[v3,2/4] perf/bpf: Remove unneeded uses_default_overflow_handler.

Message ID 20231211045543.31741-3-khuey@kylehuey.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Combine perf and bpf for fast eval of hw breakpoint conditions | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch
bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

Kyle Huey Dec. 11, 2023, 4:55 a.m. UTC 
Now that struct perf_event's orig_overflow_handler is gone, there's no need
for the functions and macros to support looking past overflow_handler to
orig_overflow_handler.

This patch is solely a refactoring and results in no behavior change.

Signed-off-by: Kyle Huey <khuey@kylehuey.com>
---
 arch/arm/kernel/hw_breakpoint.c   |  8 ++++----
 arch/arm64/kernel/hw_breakpoint.c |  4 ++--
 include/linux/perf_event.h        | 16 ++--------------
 3 files changed, 8 insertions(+), 20 deletions(-)

Comments

Will Deacon Dec. 12, 2023, 9:22 a.m. UTC | #1 
On Sun, Dec 10, 2023 at 08:55:41PM -0800, Kyle Huey wrote:
> Now that struct perf_event's orig_overflow_handler is gone, there's no need
> for the functions and macros to support looking past overflow_handler to
> orig_overflow_handler.
> 
> This patch is solely a refactoring and results in no behavior change.
> 
> Signed-off-by: Kyle Huey <khuey@kylehuey.com>
> ---
>  arch/arm/kernel/hw_breakpoint.c   |  8 ++++----
>  arch/arm64/kernel/hw_breakpoint.c |  4 ++--
>  include/linux/perf_event.h        | 16 ++--------------
>  3 files changed, 8 insertions(+), 20 deletions(-)

Acked-by: Will Deacon <will@kernel.org>

Will
Song Liu Jan. 2, 2024, 10:56 p.m. UTC | #2 
On Tue, Dec 12, 2023 at 1:22 AM Will Deacon <will@kernel.org> wrote:
>
> On Sun, Dec 10, 2023 at 08:55:41PM -0800, Kyle Huey wrote:
> > Now that struct perf_event's orig_overflow_handler is gone, there's no need
> > for the functions and macros to support looking past overflow_handler to
> > orig_overflow_handler.
> >
> > This patch is solely a refactoring and results in no behavior change.
> >
> > Signed-off-by: Kyle Huey <khuey@kylehuey.com>
> > ---
> >  arch/arm/kernel/hw_breakpoint.c   |  8 ++++----
> >  arch/arm64/kernel/hw_breakpoint.c |  4 ++--
> >  include/linux/perf_event.h        | 16 ++--------------
> >  3 files changed, 8 insertions(+), 20 deletions(-)
>
> Acked-by: Will Deacon <will@kernel.org>

Acked-by: Song Liu <song@kernel.org>
diff mbox series

Patch

diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index dc0fb7a81371..054e9199f30d 100644
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -626,7 +626,7 @@  int hw_breakpoint_arch_parse(struct perf_event *bp,
 	hw->address &= ~alignment_mask;
 	hw->ctrl.len <<= offset;
 
-	if (uses_default_overflow_handler(bp)) {
+	if (is_default_overflow_handler(bp)) {
 		/*
 		 * Mismatch breakpoints are required for single-stepping
 		 * breakpoints.
@@ -798,7 +798,7 @@  static void watchpoint_handler(unsigned long addr, unsigned int fsr,
 		 * Otherwise, insert a temporary mismatch breakpoint so that
 		 * we can single-step over the watchpoint trigger.
 		 */
-		if (!uses_default_overflow_handler(wp))
+		if (!is_default_overflow_handler(wp))
 			continue;
 step:
 		enable_single_step(wp, instruction_pointer(regs));
@@ -811,7 +811,7 @@  static void watchpoint_handler(unsigned long addr, unsigned int fsr,
 		info->trigger = addr;
 		pr_debug("watchpoint fired: address = 0x%x\n", info->trigger);
 		perf_bp_event(wp, regs);
-		if (uses_default_overflow_handler(wp))
+		if (is_default_overflow_handler(wp))
 			enable_single_step(wp, instruction_pointer(regs));
 	}
 
@@ -886,7 +886,7 @@  static void breakpoint_handler(unsigned long unknown, struct pt_regs *regs)
 			info->trigger = addr;
 			pr_debug("breakpoint fired: address = 0x%x\n", addr);
 			perf_bp_event(bp, regs);
-			if (uses_default_overflow_handler(bp))
+			if (is_default_overflow_handler(bp))
 				enable_single_step(bp, addr);
 			goto unlock;
 		}
diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
index 35225632d70a..db2a1861bb97 100644
--- a/arch/arm64/kernel/hw_breakpoint.c
+++ b/arch/arm64/kernel/hw_breakpoint.c
@@ -654,7 +654,7 @@  static int breakpoint_handler(unsigned long unused, unsigned long esr,
 		perf_bp_event(bp, regs);
 
 		/* Do we need to handle the stepping? */
-		if (uses_default_overflow_handler(bp))
+		if (is_default_overflow_handler(bp))
 			step = 1;
 unlock:
 		rcu_read_unlock();
@@ -733,7 +733,7 @@  static u64 get_distance_from_watchpoint(unsigned long addr, u64 val,
 static int watchpoint_report(struct perf_event *wp, unsigned long addr,
 			     struct pt_regs *regs)
 {
-	int step = uses_default_overflow_handler(wp);
+	int step = is_default_overflow_handler(wp);
 	struct arch_hw_breakpoint *info = counter_arch_bp(wp);
 
 	info->trigger = addr;
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 312b9f31442c..7fef6299151b 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1321,8 +1321,9 @@  extern int perf_event_output(struct perf_event *event,
 			     struct pt_regs *regs);
 
 static inline bool
-__is_default_overflow_handler(perf_overflow_handler_t overflow_handler)
+is_default_overflow_handler(struct perf_event *event)
 {
+	perf_overflow_handler_t overflow_handler = event->overflow_handler;
 	if (likely(overflow_handler == perf_event_output_forward))
 		return true;
 	if (unlikely(overflow_handler == perf_event_output_backward))
@@ -1330,19 +1331,6 @@  __is_default_overflow_handler(perf_overflow_handler_t overflow_handler)
 	return false;
 }
 
-#define is_default_overflow_handler(event) \
-	__is_default_overflow_handler((event)->overflow_handler)
-
-#ifdef CONFIG_BPF_SYSCALL
-static inline bool uses_default_overflow_handler(struct perf_event *event)
-{
-	return is_default_overflow_handler(event);
-}
-#else
-#define uses_default_overflow_handler(event) \
-	is_default_overflow_handler(event)
-#endif
-
 extern void
 perf_event_header__init_id(struct perf_event_header *header,
 			   struct perf_sample_data *data,