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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-21 13:18:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-21 13:18:36 -0700 |
| commit | bf70030dc0b031f000c74721f2e9c88686b7da6d (patch) | |
| tree | e5cd09cb2d7b33647c8fa0b9288bbaf81c0e6d80 /arch/x86/kernel | |
| parent | d60a2793ba562c6ea9bbf62112da3e6342adcf83 (diff) | |
| parent | 366d4a43b1a7a861c356a0e407c4f03f454d42ea (diff) | |
| download | linux-stable-bf70030dc0b031f000c74721f2e9c88686b7da6d.tar.gz linux-stable-bf70030dc0b031f000c74721f2e9c88686b7da6d.tar.bz2 linux-stable-bf70030dc0b031f000c74721f2e9c88686b7da6d.zip | |
Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86, cpu: Fix X86_FEATURE_NOPL
x86, cpu: Re-run get_cpu_cap() after adjusting the CPUID level
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 15 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/cpu.h | 1 |
2 files changed, 11 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 15c671385f59..92af7b420ab2 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -704,16 +704,21 @@ void __init early_cpu_init(void) } /* - * The NOPL instruction is supposed to exist on all CPUs with - * family >= 6; unfortunately, that's not true in practice because - * of early VIA chips and (more importantly) broken virtualizers that - * are not easy to detect. In the latter case it doesn't even *fail* - * reliably, so probing for it doesn't even work. Disable it completely + * The NOPL instruction is supposed to exist on all CPUs of family >= 6; + * unfortunately, that's not true in practice because of early VIA + * chips and (more importantly) broken virtualizers that are not easy + * to detect. In the latter case it doesn't even *fail* reliably, so + * probing for it doesn't even work. Disable it completely on 32-bit * unless we can find a reliable way to detect all the broken cases. + * Enable it explicitly on 64-bit for non-constant inputs of cpu_has(). */ static void __cpuinit detect_nopl(struct cpuinfo_x86 *c) { +#ifdef CONFIG_X86_32 clear_cpu_cap(c, X86_FEATURE_NOPL); +#else + set_cpu_cap(c, X86_FEATURE_NOPL); +#endif } static void __cpuinit generic_identify(struct cpuinfo_x86 *c) diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h index f668bb1f7d43..e765633f210e 100644 --- a/arch/x86/kernel/cpu/cpu.h +++ b/arch/x86/kernel/cpu/cpu.h @@ -32,6 +32,7 @@ struct cpu_dev { extern const struct cpu_dev *const __x86_cpu_dev_start[], *const __x86_cpu_dev_end[]; +extern void get_cpu_cap(struct cpuinfo_x86 *c); extern void cpu_detect_cache_sizes(struct cpuinfo_x86 *c); extern void get_cpu_cap(struct cpuinfo_x86 *c); |