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authorFrederic Weisbecker <fweisbec@gmail.com>2009-01-25 12:50:13 -0800
committerIngo Molnar <mingo@elte.hu>2009-01-26 14:06:36 +0100
commit2d4d57db692ea790e185656516e6ebe8791f1788 (patch)
treef7ad21dbcb4d5de2f0eb63024c1b5f1bf5321d76 /arch/x86/include/asm/paravirt.h
parent7106a5ab89c50c6b5aadea0850b40323804a922d (diff)
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x86: micro-optimize __raw_read_trylock()
The current version of __raw_read_trylock starts with decrementing the lock and read its new value as a separate operation after that. That makes 3 dereferences (read, write (after sub), read) whereas a single atomic_dec_return does only two pointers dereferences (read, write). Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/paravirt.h')
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