On 11/11/2014 10:43 AM, Ross Zwisler wrote: > Add support for the new pcommit instruction. This instruction was > announced in the document "Intel Architecture Instruction Set Extensions > Programming Reference" with reference number 319433-022. > > https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf > > Signed-off-by: Ross Zwisler <ross.zwisler at linux.intel.com> > Cc: H Peter Anvin <h.peter.anvin at intel.com> > Cc: Ingo Molnar <mingo at kernel.org> > Cc: Thomas Gleixner <tglx at linutronix.de> > Cc: David Airlie <airlied at linux.ie> > Cc: dri-devel at lists.freedesktop.org > Cc: x86 at kernel.org > --- > arch/x86/include/asm/cpufeature.h | 1 + > arch/x86/include/asm/special_insns.h | 6 ++++++ > 2 files changed, 7 insertions(+) > > diff --git a/arch/x86/include/asm/cpufeature.h > b/arch/x86/include/asm/cpufeature.h > index 0bb1335..b3e6b89 100644 > --- a/arch/x86/include/asm/cpufeature.h > +++ b/arch/x86/include/asm/cpufeature.h > @@ -225,6 +225,7 @@ > #define X86_FEATURE_RDSEED ( 9*32+18) /* The RDSEED instruction */ > #define X86_FEATURE_ADX ( 9*32+19) /* The ADCX and ADOX > instructions */ > #define X86_FEATURE_SMAP ( 9*32+20) /* Supervisor Mode Access Prevention > */ > +#define X86_FEATURE_PCOMMIT ( 9*32+22) /* PCOMMIT instruction */ > #define X86_FEATURE_CLFLUSHOPT ( 9*32+23) /* CLFLUSHOPT instruction */ > #define X86_FEATURE_AVX512PF ( 9*32+26) /* AVX-512 Prefetch */ > #define X86_FEATURE_AVX512ER ( 9*32+27) /* AVX-512 Exponential and > Reciprocal */ > diff --git a/arch/x86/include/asm/special_insns.h > b/arch/x86/include/asm/special_insns.h > index e820c08..1709a2e 100644 > --- a/arch/x86/include/asm/special_insns.h > +++ b/arch/x86/include/asm/special_insns.h > @@ -199,6 +199,12 @@ static inline void clflushopt(volatile void *__p) > "+m" (*(volatile char __force *)__p)); > } > > +static inline void pcommit(void) > +{ > + alternative(ASM_NOP4, ".byte 0x66, 0x0f, 0xae, 0xf8", > + X86_FEATURE_PCOMMIT); > +} > +
Should this patch add the feature bit and cpuinfo entry to go with it? --Andy
