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Date: Sat, 19 Jan 2008 05:32:18 +0100 (CET) From: Andi Kleen <ak@...e.de> To: davej@...emonkey.org.uk, mingo@...e.hu, tglx@...utronix.de, jesse.barnes@...el.com, andreas.herrmann3@....com, linux-kernel@...r.kernel.org Subject: [PATCH] [1/2] Fix some inaccurate comments in MTRR checking code - is_cpu(INTEL) actually refers only to the MTRR architecture and all AMD CPUs since K7 use the Intel MTRR architecture so the fixup code runs on AMD too. Remove a comment claiming otherwise. [Perhaps is_cpu should be renamed, the name is clearly confusing] - Clarify another incorrect comment. Cc: davej@...emonkey.org.uk Signed-off-by: Andi Kleen <ak@...e.de> --- arch/x86/kernel/cpu/mtrr/main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux/arch/x86/kernel/cpu/mtrr/main.c =================================================================== --- linux.orig/arch/x86/kernel/cpu/mtrr/main.c +++ linux/arch/x86/kernel/cpu/mtrr/main.c @@ -640,6 +640,8 @@ early_param("disable_mtrr_trim", disable * Some buggy BIOSes don't setup the MTRRs properly for systems with certain * memory configurations. This routine checks to make sure the MTRRs having * a write back type cover all of the memory the kernel is intending to use. + * [AK: actually it doesn't check that. It just checks that the highest + * MTRR is matching the end of memory. That is not quite the same.] * If not, it'll trim any memory off the end by adjusting end_pfn, removing * it from the kernel's allocation pools, warning the user with an obnoxious * message. @@ -649,7 +651,6 @@ void __init mtrr_trim_uncached_memory(vo unsigned long i, base, size, highest_addr = 0, def, dummy; mtrr_type type; - /* Make sure we only trim uncachable memory on Intel machines */ rdmsr(MTRRdefType_MSR, def, dummy); def &= 0xff; if (!is_cpu(INTEL) || disable_mtrr_trim || def != MTRR_TYPE_UNCACHABLE) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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