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authorAndy Lutomirski <luto@MIT.EDU>2011-05-23 09:31:27 -0400
committerThomas Gleixner <tglx@linutronix.de>2011-05-24 08:51:28 -0400
commit0f51f2852ccf0fe38a02d340d0ba625e8e32a863 (patch)
tree075e1f7c85c4deec2e0ab7509dcafa859842abd9 /arch/x86/kernel/Makefile
parent3729db5ca2b2000c660e5a5d0eb68b1053212cab (diff)
x86-64: Vclock_gettime(CLOCK_MONOTONIC) can't ever see nsec < 0
vclock_gettime's do_monotonic helper can't ever generate a negative nsec value, so it doesn't need to check whether it's negative. In the CLOCK_MONOTONIC_COARSE case, ns can't ever exceed 2e9-1, so we can avoid the loop entirely. This saves a single easily-predicted branch. Signed-off-by: Andy Lutomirski <luto@mit.edu> Cc: Andi Kleen <andi@firstfloor.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Borislav Petkov <bp@amd64.org> Link: http://lkml.kernel.org/r/%3Cd6d528d32c7a21618057cfc9005942a0fe5cb54a.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/Makefile')
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