linux/trace_clock.c at d594aa0277e541bb997aef0bc0a55172d8138340 - linux - ClassFun

korg/linux

mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-19 10:14:23 +08:00

Andy Lutomirski 03b9730b76 x86/asm/tsc: Add rdtsc_ordered() and use it in trivial call sites

rdtsc_barrier(); rdtsc() is an unnecessary mouthful and requires
more thought than should be necessary. Add an rdtsc_ordered()
helper and replace the trivial call sites with it.

This should not change generated code. The duplication of the
fence asm is temporary.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm ML <kvm@vger.kernel.org>
Link: http://lkml.kernel.org/r/dddbf98a2af53312e9aa73a5a2b1622fe5d6f52b.1434501121.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2015-07-06 15:23:29 +02:00

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 /*
  * X86 trace clocks
  */
 #include <asm/trace_clock.h>
 #include <asm/barrier.h>
 #include <asm/msr.h>
 /*
  * trace_clock_x86_tsc(): A clock that is just the cycle counter.
  *
  * Unlike the other clocks, this is not in nanoseconds.
  */
 u64 notrace trace_clock_x86_tsc(void)
 {
 	return rdtsc_ordered();
 }