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authorIngo Molnar <mingo@elte.hu>2009-07-03 12:51:19 +0200
committerIngo Molnar <mingo@elte.hu>2009-07-03 13:26:43 +0200
commit3ac805d2afd3fa4a07cb5bcf352fd7fa83f28935 (patch)
tree29e4928248f19565f883156eb04e736510c88713 /arch
parent824975ef190e7dcb77718d1cc2cb53769b16d918 (diff)
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op-kernel-dev-3ac805d2afd3fa4a07cb5bcf352fd7fa83f28935.tar.gz
x86: atomic64: Reduce size of functions
cmpxchg8b is a huge instruction in terms of register footprint, we almost never want to inline it, not even within the same code module. GCC 4.3 still messes up for two functions, under-judging the true cost of this instruction - so annotate two key functions to reduce the bloat: arch/x86/lib/atomic64_32.o: text data bss dec hex filename 1763 0 0 1763 6e3 atomic64_32.o.before 435 0 0 435 1b3 atomic64_32.o.after Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> LKML-Reference: <alpine.LFD.2.01.0907021653030.3210@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/lib/atomic64_32.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/lib/atomic64_32.c b/arch/x86/lib/atomic64_32.c
index 6195962..a910238 100644
--- a/arch/x86/lib/atomic64_32.c
+++ b/arch/x86/lib/atomic64_32.c
@@ -4,7 +4,7 @@
#include <asm/cmpxchg.h>
#include <asm/atomic.h>
-static inline u64 cmpxchg8b(u64 *ptr, u64 old, u64 new)
+static noinline u64 cmpxchg8b(u64 *ptr, u64 old, u64 new)
{
u32 low = new;
u32 high = new >> 32;
@@ -74,7 +74,7 @@ u64 atomic64_read(atomic64_t *ptr)
*
* Atomically adds @delta to @ptr and returns @delta + *@ptr
*/
-u64 atomic64_add_return(u64 delta, atomic64_t *ptr)
+noinline u64 atomic64_add_return(u64 delta, atomic64_t *ptr)
{
/*
* Try first with a (probably incorrect) assumption about
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