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x86: mtrr_cleanup try gran_size to less than 1M, v3

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J.A. Magallón reported:

 >> Also, on a 64 bit box with 4Gb, it gives this:
 >>
 >> cicely:~# cat /proc/mtrr
 >> reg00: base=0x00000000 (   0MB), size=4096MB: write-back, count=1
 >> reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
 >> reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1
 >> reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1
 >> reg04: base=0x80000000 (2048MB), size=2048MB: uncachable, count=1

boundary handling has a problem ... fix it.

Reported-by: J.A. Magallón <jamagallon@ono.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-10-02 15:46:20 -07:00 committed by Ingo Molnar
parent 136c82c6f7
commit 834836ee6a
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/cpu/mtrr/main.c
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@ -1044,7 +1044,7 @@ range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek,
hole_sizek = range0_sizek - state->range_sizek - second_sizek;
/* hole size should be less than half of range0 size */
if (hole_sizek > (range0_sizek >> 1) &&
if (hole_sizek >= (range0_sizek >> 1) &&
range0_sizek >= chunk_sizek) {
range0_sizek -= chunk_sizek;
second_sizek = 0;