| Message ID | 180fd042261dcd4243fad90660b114b8f0a78dcd.1697460614.git.geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | sunrpc: Fix W=1 compiler warnings | expand |
On 16 Oct 2023, at 9:09, Geert Uytterhoeven wrote: > When building NFS with W=1 and CONFIG_WERROR=y, but > CONFIG_SUNRPC_DEBUG=n: > > fs/nfs/nfs4proc.c: In function ‘nfs4_proc_create_session’: > fs/nfs/nfs4proc.c:9276:19: error: variable ‘ptr’ set but not used [-Werror=unused-but-set-variable] > 9276 | unsigned *ptr; > | ^~~ > CC fs/nfs/callback.o > fs/nfs/callback.c: In function ‘nfs41_callback_svc’: > fs/nfs/callback.c:98:13: error: variable ‘error’ set but not used [-Werror=unused-but-set-variable] > 98 | int error; > | ^~~~~ > CC fs/nfs/flexfilelayout/flexfilelayout.o > fs/nfs/flexfilelayout/flexfilelayout.c: In function ‘ff_layout_io_track_ds_error’: > fs/nfs/flexfilelayout/flexfilelayout.c:1230:13: error: variable ‘err’ set but not used [-Werror=unused-but-set-variable] > 1230 | int err; > | ^~~ > CC fs/nfs/flexfilelayout/flexfilelayoutdev.o > fs/nfs/flexfilelayout/flexfilelayoutdev.c: In function ‘nfs4_ff_alloc_deviceid_node’: > fs/nfs/flexfilelayout/flexfilelayoutdev.c:55:16: error: variable ‘ret’ set but not used [-Werror=unused-but-set-variable] > 55 | int i, ret = -ENOMEM; > | ^~~ > > All these are due to variables that are set unconditionally, but are > used only when debugging is enabled. > > Fix this by changing the dfprintk*() dummy macros from empty loops to > calls to the no_printk() helper. This informs the compiler that the > passed debug parameters are actually used, and enables format specifier > checking as a bonus. > > This requires removing the protection by CONFIG_SUNRPC_DEBUG of the > declaration of nlmdbg_cookie2a() in fs/lockd/svclock.c, as its reference > is now visible to the compiler, but optimized away. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > Acked-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Benjamin Coddington <bcodding@redhat.com> Ben
On Mon, Oct 16, 2023 at 3:09 PM Geert Uytterhoeven <geert+renesas@glider.be> wrote: > When building NFS with W=1 and CONFIG_WERROR=y, but > CONFIG_SUNRPC_DEBUG=n: > > fs/nfs/nfs4proc.c: In function ‘nfs4_proc_create_session’: > fs/nfs/nfs4proc.c:9276:19: error: variable ‘ptr’ set but not used [-Werror=unused-but-set-variable] > 9276 | unsigned *ptr; > | ^~~ > CC fs/nfs/callback.o > fs/nfs/callback.c: In function ‘nfs41_callback_svc’: > fs/nfs/callback.c:98:13: error: variable ‘error’ set but not used [-Werror=unused-but-set-variable] > 98 | int error; > | ^~~~~ > CC fs/nfs/flexfilelayout/flexfilelayout.o > fs/nfs/flexfilelayout/flexfilelayout.c: In function ‘ff_layout_io_track_ds_error’: > fs/nfs/flexfilelayout/flexfilelayout.c:1230:13: error: variable ‘err’ set but not used [-Werror=unused-but-set-variable] > 1230 | int err; > | ^~~ > CC fs/nfs/flexfilelayout/flexfilelayoutdev.o > fs/nfs/flexfilelayout/flexfilelayoutdev.c: In function ‘nfs4_ff_alloc_deviceid_node’: > fs/nfs/flexfilelayout/flexfilelayoutdev.c:55:16: error: variable ‘ret’ set but not used [-Werror=unused-but-set-variable] > 55 | int i, ret = -ENOMEM; > | ^~~ > > All these are due to variables that are set unconditionally, but are > used only when debugging is enabled. > > Fix this by changing the dfprintk*() dummy macros from empty loops to > calls to the no_printk() helper. This informs the compiler that the > passed debug parameters are actually used, and enables format specifier > checking as a bonus. > > This requires removing the protection by CONFIG_SUNRPC_DEBUG of the > declaration of nlmdbg_cookie2a() in fs/lockd/svclock.c, as its reference > is now visible to the compiler, but optimized away. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > Acked-by: Jeff Layton <jlayton@kernel.org> > --- a/include/linux/sunrpc/debug.h > +++ b/include/linux/sunrpc/debug.h > @@ -67,9 +67,9 @@ do { \ > # define RPC_IFDEBUG(x) x > #else > # define ifdebug(fac) if (0) > -# define dfprintk(fac, fmt, ...) do {} while (0) > -# define dfprintk_cont(fac, fmt, ...) do {} while (0) > -# define dfprintk_rcu(fac, fmt, ...) do {} while (0) > +# define dfprintk(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) > +# define dfprintk_cont(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) > +# define dfprintk_rcu(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) > # define RPC_IFDEBUG(x) > #endif I discovered a new build issue related to the use of RPC_IFDEBUG() in fs/nfsd/nfsfh.c. So there will be a v4... Gr{oetje,eeting}s, Geert
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index 43aeba9de55cbbc5..b80e0e143c5db16a 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -55,7 +55,6 @@ static const struct rpc_call_ops nlmsvc_grant_ops; static LIST_HEAD(nlm_blocked); static DEFINE_SPINLOCK(nlm_blocked_lock); -#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) { /* @@ -82,7 +81,6 @@ static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) return buf; } -#endif /* * Insert a blocked lock into the global list diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h index f6aeed07fe04e3d5..76539c6673f2fb15 100644 --- a/include/linux/sunrpc/debug.h +++ b/include/linux/sunrpc/debug.h @@ -67,9 +67,9 @@ do { \ # define RPC_IFDEBUG(x) x #else # define ifdebug(fac) if (0) -# define dfprintk(fac, fmt, ...) do {} while (0) -# define dfprintk_cont(fac, fmt, ...) do {} while (0) -# define dfprintk_rcu(fac, fmt, ...) do {} while (0) +# define dfprintk(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) +# define dfprintk_cont(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) +# define dfprintk_rcu(fac, fmt, ...) no_printk(fmt, ##__VA_ARGS__) # define RPC_IFDEBUG(x) #endif
When building NFS with W=1 and CONFIG_WERROR=y, but CONFIG_SUNRPC_DEBUG=n: fs/nfs/nfs4proc.c: In function ‘nfs4_proc_create_session’: fs/nfs/nfs4proc.c:9276:19: error: variable ‘ptr’ set but not used [-Werror=unused-but-set-variable] 9276 | unsigned *ptr; | ^~~ CC fs/nfs/callback.o fs/nfs/callback.c: In function ‘nfs41_callback_svc’: fs/nfs/callback.c:98:13: error: variable ‘error’ set but not used [-Werror=unused-but-set-variable] 98 | int error; | ^~~~~ CC fs/nfs/flexfilelayout/flexfilelayout.o fs/nfs/flexfilelayout/flexfilelayout.c: In function ‘ff_layout_io_track_ds_error’: fs/nfs/flexfilelayout/flexfilelayout.c:1230:13: error: variable ‘err’ set but not used [-Werror=unused-but-set-variable] 1230 | int err; | ^~~ CC fs/nfs/flexfilelayout/flexfilelayoutdev.o fs/nfs/flexfilelayout/flexfilelayoutdev.c: In function ‘nfs4_ff_alloc_deviceid_node’: fs/nfs/flexfilelayout/flexfilelayoutdev.c:55:16: error: variable ‘ret’ set but not used [-Werror=unused-but-set-variable] 55 | int i, ret = -ENOMEM; | ^~~ All these are due to variables that are set unconditionally, but are used only when debugging is enabled. Fix this by changing the dfprintk*() dummy macros from empty loops to calls to the no_printk() helper. This informs the compiler that the passed debug parameters are actually used, and enables format specifier checking as a bonus. This requires removing the protection by CONFIG_SUNRPC_DEBUG of the declaration of nlmdbg_cookie2a() in fs/lockd/svclock.c, as its reference is now visible to the compiler, but optimized away. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Jeff Layton <jlayton@kernel.org> --- v3: - Add Acked-by, v2: - s/uncontionally/unconditionally/, - Drop CONFIG_SUNRPC_DEBUG check in fs/lockd/svclock.c to fix build failure. --- fs/lockd/svclock.c | 2 -- include/linux/sunrpc/debug.h | 6 +++--- 2 files changed, 3 insertions(+), 5 deletions(-)