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author | Andy Lutomirski <luto@kernel.org> | 2015-06-25 16:44:08 (GMT) |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-07-06 13:23:29 (GMT) |
commit | 03b9730b769fc4d87e40f6104f4c5b2e43889f19 (patch) | |
tree | a3f46bac8fc6ee76933f5f17c2d9f30059957529 /arch/x86/kernel/trace_clock.c | |
parent | 4ea1636b04dbd66536fa387bae2eea463efc705b (diff) | |
download | linux-03b9730b769fc4d87e40f6104f4c5b2e43889f19.tar.xz |
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>
Diffstat (limited to 'arch/x86/kernel/trace_clock.c')
-rw-r--r-- | arch/x86/kernel/trace_clock.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/x86/kernel/trace_clock.c b/arch/x86/kernel/trace_clock.c index 67efb8c..80bb24d 100644 --- a/arch/x86/kernel/trace_clock.c +++ b/arch/x86/kernel/trace_clock.c @@ -12,10 +12,5 @@ */ u64 notrace trace_clock_x86_tsc(void) { - u64 ret; - - rdtsc_barrier(); - ret = rdtsc(); - - return ret; + return rdtsc_ordered(); } |