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authorDenys Vlasenko <dvlasenk@redhat.com>2015-08-04 16:15:14 +0200
committerIngo Molnar <mingo@kernel.org>2015-08-05 09:38:08 +0200
commit1a1d48a4a8fde49aedc045d894efe67173d59fe0 (patch)
treeb1e4dc0bd4c7621c98610947d3baa417d73ae6ef /include/linux/bitops.h
parentc2f3ba745d1c2013811cac6308c4abf9527c478e (diff)
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linux/bitmap: Force inlining of bitmap weight functions
With this config: http://busybox.net/~vda/kernel_config_OPTIMIZE_INLINING_and_Os gcc-4.7.2 generates many copies of these tiny functions: bitmap_weight (55 copies): 55 push %rbp 48 89 e5 mov %rsp,%rbp e8 3f 3a 8b 00 callq __bitmap_weight 5d pop %rbp c3 retq hweight_long (23 copies): 55 push %rbp e8 b5 65 8e 00 callq __sw_hweight64 48 89 e5 mov %rsp,%rbp 5d pop %rbp c3 retq See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66122 This patch fixes this via s/inline/__always_inline/ While at it, replaced two "__inline__" with usual "inline" (the rest of the source file uses the latter). text data bss dec filename 86971357 17195880 36659200 140826437 vmlinux.before 86971120 17195912 36659200 140826232 vmlinux Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Rientjes <rientjes@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Graf <tgraf@suug.ch> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1438697716-28121-1-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/bitops.h')
-rw-r--r--include/linux/bitops.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 297f5bda4fdf..e63553386ae7 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -57,7 +57,7 @@ extern unsigned long __sw_hweight64(__u64 w);
(bit) < (size); \
(bit) = find_next_zero_bit((addr), (size), (bit) + 1))
-static __inline__ int get_bitmask_order(unsigned int count)
+static inline int get_bitmask_order(unsigned int count)
{
int order;
@@ -65,7 +65,7 @@ static __inline__ int get_bitmask_order(unsigned int count)
return order; /* We could be slightly more clever with -1 here... */
}
-static __inline__ int get_count_order(unsigned int count)
+static inline int get_count_order(unsigned int count)
{
int order;
@@ -75,7 +75,7 @@ static __inline__ int get_count_order(unsigned int count)
return order;
}
-static inline unsigned long hweight_long(unsigned long w)
+static __always_inline unsigned long hweight_long(unsigned long w)
{
return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
}