[PATCH] Use string instructions for Core2 copy/clear
It is faster than using a unrolled loop for the use cases the kernel
cares about (cached, sizes typically < 4K)
Signed-off-by: Andi Kleen <ak@suse.de>
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index e328e3e..085f2e0 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -843,6 +843,8 @@
if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
(c->x86 == 0x6 && c->x86_model >= 0x0e))
set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
+ if (c->x86 == 6)
+ set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
c->x86_max_cores = intel_num_cpu_cores(c);