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x86/asm/tsc: Add rdtscll() merge helper

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Some in-flight code makes use of the old rdtscll() (now removed), provide a wrapper
for a kernel cycle to smooth the transition to rdtsc().

( We use the safest variant, rdtsc_ordered(), which has barriers - this adds another
  incentive to remove the wrapper in the future. )

Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Huang Rui <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: kvm ML <[email protected]>
Link: http://lkml.kernel.org/r/dddbf98a2af53312e9aa73a5a2b1622fe5d6f52b.1434501121.git.luto@kernel.org
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ingo Molnar 2015-08-21 08:33:53 +02:00
commit 99770737ca
1 changed files with 3 additions and 0 deletions
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3
arch/x86/include/asm/msr.h
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@ -152,6 +152,9 @@ static __always_inline unsigned long long rdtsc_ordered(void)
return rdtsc();
}
/* Deprecated, keep it for a cycle for easier merging: */
#define rdtscll(now) do { (now) = rdtsc_ordered(); } while (0)
static inline unsigned long long native_read_pmc(int counter)
{
DECLARE_ARGS(val, low, high);