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| author | Andy Lutomirski <luto@MIT.EDU> | 2011-05-23 15:31:28 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-05-24 14:51:29 +0200 |
| commit | 44259b1abfaa8bb819d25d41d71e8e33e25dd36a (patch) | |
| tree | 6255324c0bf2fef17ec3f7d92cdc88d9bbed44a3 /arch/x86/include/asm/tsc.h | |
| parent | x86-64: Vclock_gettime(CLOCK_MONOTONIC) can't ever see nsec < 0 (diff) | |
| download | linux-44259b1abfaa8bb819d25d41d71e8e33e25dd36a.tar.xz linux-44259b1abfaa8bb819d25d41d71e8e33e25dd36a.zip | |
x86-64: Move vread_tsc into a new file with sensible options
vread_tsc is short and hot, and it's userspace code so the usual
reasons to enable -pg and turn off sibling calls don't apply.
(OK, turning off sibling calls has no effect. But it might
someday...)
As an added benefit, tsc.c is profilable now.
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/%3C99c6d7f5efa3ccb65b4ac6eb443e1ab7bad47d7b.1306156808.git.luto%40mit.edu%3E
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/include/asm/tsc.h')
| -rw-r--r-- | arch/x86/include/asm/tsc.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h index 83e2efd181e2..9db5583b6d38 100644 --- a/arch/x86/include/asm/tsc.h +++ b/arch/x86/include/asm/tsc.h @@ -51,6 +51,10 @@ extern int unsynchronized_tsc(void); extern int check_tsc_unstable(void); extern unsigned long native_calibrate_tsc(void); +#ifdef CONFIG_X86_64 +extern cycles_t vread_tsc(void); +#endif + /* * Boot-time check whether the TSCs are synchronized across * all CPUs/cores: |