From d4387bd3fa1d27e03bc87533c1650e24417c8016 Mon Sep 17 00:00:00 2001 From: "Huang, Ying" Date: Thu, 31 Jan 2008 22:05:45 +0100 Subject: [PATCH] x86: c_p_a clflush_cache_range fix Because in i386 early boot stage, boot_cpu_data may be not available, which makes clflush_cach_range() into infinite loop, which is called by change_page_attr(). This patch fixes this by setting boot_cpu_data.x86_clflush_size in early_cpu_detect(). Signed-off-by: Huang Ying Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/common.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index db28aa9e2f6..d608c9ebbfe 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -274,8 +274,10 @@ void __init cpu_detect(struct cpuinfo_x86 *c) if (c->x86 >= 0x6) c->x86_model += ((tfms >> 16) & 0xF) << 4; c->x86_mask = tfms & 15; - if (cap0 & (1<<19)) + if (cap0 & (1<<19)) { c->x86_cache_alignment = ((misc >> 8) & 0xff) * 8; + c->x86_clflush_size = ((misc >> 8) & 0xff) * 8; + } } } static void __cpuinit early_get_cap(struct cpuinfo_x86 *c) @@ -317,6 +319,7 @@ static void __init early_cpu_detect(void) struct cpuinfo_x86 *c = &boot_cpu_data; c->x86_cache_alignment = 32; + c->x86_clflush_size = 32; if (!have_cpuid_p()) return; -- 2.39.5