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authorAndy Lutomirski <luto@MIT.EDU>2011-05-23 09:31:28 -0400
committerThomas Gleixner <tglx@linutronix.de>2011-05-24 14:51:29 +0200
commit44259b1abfaa8bb819d25d41d71e8e33e25dd36a (patch)
tree6255324c0bf2fef17ec3f7d92cdc88d9bbed44a3 /arch/x86/include/asm/tsc.h
parent0f51f2852ccf0fe38a02d340d0ba625e8e32a863 (diff)
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.h4
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: