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Commit 057237bb authored by Borislav Petkov's avatar Borislav Petkov Committed by H. Peter Anvin
Browse files

x86, cpu: Preset default tlb_flushall_shift on AMD 



Run the mprotect.c microbenchmark on all our families >= K8 and preset
the flushall shift variable accordingly.

Signed-off-by: default avatarBorislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1344272439-29080-5-git-send-email-bp@amd64.org


Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent b46882e4

arch/x86/kernel/cpu/amd.c

+13 −0
Original line number Diff line number Diff line
@@ -737,6 +737,17 @@ static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 *c, 
}

#endif



static void __cpuinit cpu_set_tlb_flushall_shift(struct cpuinfo_x86 *c)

{

	if (!cpu_has_invlpg)

		return;



	tlb_flushall_shift = 5;



	if (c->x86 <= 0x11)

		tlb_flushall_shift = 4;

}



static void __cpuinit cpu_detect_tlb_amd(struct cpuinfo_x86 *c)

{

	u32 ebx, eax, ecx, edx;
@@ -788,6 +799,8 @@ static void __cpuinit cpu_detect_tlb_amd(struct cpuinfo_x86 *c) 
		tlb_lli_2m[ENTRIES] = eax & mask;



	tlb_lli_4m[ENTRIES] = tlb_lli_2m[ENTRIES] >> 1;



	cpu_set_tlb_flushall_shift(c);

}



static const struct cpu_dev __cpuinitconst amd_cpu_dev = {