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author | Ingo Molnar <mingo@elte.hu> | 2008-09-23 23:26:42 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-09-23 23:26:42 +0200 |
commit | 07bbc16a8676b06950a21f35b59f69b2fe763bbd (patch) | |
tree | f87fbfea747e9d92591c8d0a54db7c487e3c3d78 /arch/x86/kernel/cpu/common.c | |
parent | 6a9e91846bf52cc70a0417de19fdfac224c435c4 (diff) | |
parent | f8e256c687eb53850685747757c8d75e58756e15 (diff) | |
download | op-kernel-dev-07bbc16a8676b06950a21f35b59f69b2fe763bbd.zip op-kernel-dev-07bbc16a8676b06950a21f35b59f69b2fe763bbd.tar.gz |
Merge branch 'timers/urgent' into x86/xen
Conflicts:
arch/x86/kernel/process_32.c
arch/x86/kernel/process_64.c
Manual merge:
arch/x86/kernel/smpboot.c
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/common.c')
-rw-r--r-- | arch/x86/kernel/cpu/common.c | 24 |
1 files changed, 4 insertions, 20 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 1c7d39f..9983bc3 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -344,31 +344,15 @@ static void __init early_cpu_detect(void) /* * The NOPL instruction is supposed to exist on all CPUs with - * family >= 6, unfortunately, that's not true in practice because + * 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. Hence, probe for it based on first - * principles. + * 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 + * unless we can find a reliable way to detect all the broken cases. */ static void __cpuinit detect_nopl(struct cpuinfo_x86 *c) { - const u32 nopl_signature = 0x888c53b1; /* Random number */ - u32 has_nopl = nopl_signature; - clear_cpu_cap(c, X86_FEATURE_NOPL); - if (c->x86 >= 6) { - asm volatile("\n" - "1: .byte 0x0f,0x1f,0xc0\n" /* nopl %eax */ - "2:\n" - " .section .fixup,\"ax\"\n" - "3: xor %0,%0\n" - " jmp 2b\n" - " .previous\n" - _ASM_EXTABLE(1b,3b) - : "+a" (has_nopl)); - - if (has_nopl == nopl_signature) - set_cpu_cap(c, X86_FEATURE_NOPL); - } } static void __cpuinit generic_identify(struct cpuinfo_x86 *c) |