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| author |   Andi Kleen <ak@suse.de> | 2006-09-26 10:52:32 +0200 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:32 +0200 |
| commit | 8578bdf835d6d6ece6718858d351456367b8a5cf (patch) | |
| tree | 5bf4aa72bda1f5c508d955a2d32b5d292f8bd5a7 /include/asm-x86_64/spinlock.h | |
| parent | [PATCH] i386: Remove lock section support in semaphore.h (diff) | |
| download | linux-dev-8578bdf835d6d6ece6718858d351456367b8a5cf.tar.xz linux-dev-8578bdf835d6d6ece6718858d351456367b8a5cf.zip | |
[PATCH] Don't use lock section for mutexes and semaphores
Lock sections cannot be handled by the dwarf2 unwinder.
Disadvantage is a taken branch in the hot path.
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-x86_64/spinlock.h')
| -rw-r--r-- | include/asm-x86_64/spinlock.h | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/include/asm-x86_64/spinlock.h b/include/asm-x86_64/spinlock.h index a8e3d89f591f..1d0733b38a4b 100644 --- a/include/asm-x86_64/spinlock.h +++ b/include/asm-x86_64/spinlock.h @@ -22,14 +22,13 @@ #define __raw_spin_lock_string \ "\n1:\t" \ LOCK_PREFIX " ; decl %0\n\t" \ - "js 2f\n" \ - LOCK_SECTION_START("") \ - "2:\t" \ + "jns 2f\n" \ + "3:\n" \ "rep;nop\n\t" \ "cmpl $0,%0\n\t" \ - "jle 2b\n\t" \ + "jle 3b\n\t" \ "jmp 1b\n" \ - LOCK_SECTION_END + "2:\t" \ #define __raw_spin_lock_string_up \ "\n\tdecl %0" |