Messages in this thread Patch in this message | | | Date | Mon, 09 Feb 2009 18:40:13 -0800 | From | Yinghai Lu <> | Subject | Re: warning in arch/x86/kernel/cpu/mtrr/generic.c:400 with 2.6.29-rc3 on IBM x3400 |
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Ingo Molnar wrote: > * Morten P.D. Stevens <mstevens@win-professional.com> wrote: > >> Hi, >> >> Update: >> >> the same issue with a linux 2.6.28.4 kernel. >> >> [ 0.000000] ------------[ cut here ]------------ >> [ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/generic.c:404 generic_get_mtrr+0xdf/0x119() >> [ 0.000000] mtrr: your BIOS has set up an incorrect mask, fixing it up. > > buggy BIOS most likely. Had the kernel not fixed up the MTRRs you'd have > a very slow and unhappy system now.
please try: diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c index 0c0a455..7a359ce 100644 --- a/arch/x86/kernel/cpu/mtrr/generic.c +++ b/arch/x86/kernel/cpu/mtrr/generic.c @@ -397,7 +397,8 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base, tmp |= ~((1<<(hi - 1)) - 1); if (tmp != mask_lo) { - WARN_ONCE(1, KERN_INFO "mtrr: your BIOS has set up an incorrect mask, fixing it up.\n"); + printk(KERN_INFO "mtrr: BIOS set mask_lo: %x should be %x, fixing it up\n", mask_lo, tmp); + WARN_ONCE(1, KERN_INFO "mtrr: your BIOS has set up an incorrect mask.\n"); mask_lo = tmp; } }
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