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perf_counter, x86: remove X86_FEATURE_ARCH_PERFMON flag for AMD cpus

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X86_FEATURE_ARCH_PERFMON is an Intel hardware feature that does not
work on AMD CPUs. The flag is now only used in Intel specific code
(especially initialization).

[ Impact: refactor code ]

Signed-off-by: Robert Richter <robert.richter@amd.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1241002046-8832-2-git-send-email-robert.richter@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Robert Richter 2009-04-29 12:46:58 +02:00 committed by Ingo Molnar
parent e7fd5d4b3d
commit da1a776be1
2 changed files with 3 additions and 7 deletions
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4
arch/x86/kernel/cpu/amd.c
View File

@ -420,10 +420,6 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
if (c->x86 >= 6)
set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
/* Enable Performance counter for K7 and later */
if (c->x86 > 6 && c->x86 <= 0x11)
set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
if (!c->x86_model_id[0]) {
switch (c->x86) {
case 0xf:

6
arch/x86/kernel/cpu/perf_counter.c
View File

@ -949,6 +949,9 @@ static struct pmc_x86_ops *pmc_intel_init(void)
unsigned int unused;
unsigned int ebx;
if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
return NULL;
/*
* Check whether the Architectural PerfMon supports
* Branch Misses Retired Event or not.
@ -987,9 +990,6 @@ static struct pmc_x86_ops *pmc_amd_init(void)
void __init init_hw_perf_counters(void)
{
if (!cpu_has(&boot_cpu_data, X86_FEATURE_ARCH_PERFMON))
return;
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_INTEL:
pmc_ops = pmc_intel_init();