diff options
| author | Andreas Mohr <andi@rhlx01.fht-esslingen.de> | 2006-12-07 02:14:00 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:00 +0100 |
| commit | 9b483417527f2e47985856867c5716df013227c7 (patch) | |
| tree | 35c6e2b73ebbb9c4a97ad5d9a6f7520fab1796ef /arch/i386/kernel/cpu/mtrr/main.c | |
| parent | dc3d1742543fffc79dc4d680ab64d2059e97d809 (diff) | |
[PATCH] i386: fix buggy MTRR address checks
Fix checks that failed to realize that values are 4-kB-unit-sized (note the
format strings in this same diff context which *do* realize the unit size,
via appended "000"!). Also fix an incorrect below-1MB area check (as
gathered from Jan Beulich's unapplied patch at
http://www.ussg.iu.edu/hypermail/linux/kernel/0411.1/1378.html ) Update
mtrr_add_page() docu to make 4-kB-sized calculation more obvious.
Given several further items mentioned in Jan's patch mail, all in all MTRR
code seems surprisingly buggy, for a surprisingly long period of time (many
years). Further work/investigation would be useful.
TBD Note that my patch is pretty much UNTESTED, since I can only verify that it
TBD successfully boots my machine, but I cannot test against actual buggy
TBD hardware which would require these (formerly broken) checks. Long -mm
TBD simmering would make sense, especially since these now-working checks might
TBD turn out to have adverse effects on unaffected hardware.
Signed-off-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'arch/i386/kernel/cpu/mtrr/main.c')
| -rw-r--r-- | arch/i386/kernel/cpu/mtrr/main.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/i386/kernel/cpu/mtrr/main.c b/arch/i386/kernel/cpu/mtrr/main.c index fff90bda473..2b8b0b361cc 100644 --- a/arch/i386/kernel/cpu/mtrr/main.c +++ b/arch/i386/kernel/cpu/mtrr/main.c @@ -263,8 +263,8 @@ static void set_mtrr(unsigned int reg, unsigned long base, /** * mtrr_add_page - Add a memory type region - * @base: Physical base address of region in pages (4 KB) - * @size: Physical size of region in pages (4 KB) + * @base: Physical base address of region in pages (in units of 4 kB!) + * @size: Physical size of region in pages (4 kB) * @type: Type of MTRR desired * @increment: If this is true do usage counting on the region * |