Messages in this thread Patch in this message | | | From | "Michael S. Zick" <> | Subject | [Bug Fix]: Do 32-bit table calculations in pre-processor | Date | Fri, 3 Jul 2009 13:14:30 -0500 |
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Here is one I have found useful in my VIA processor bug hunting:
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 3068388..2303d86 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -61,7 +61,7 @@
/* Enough space to fit pagetables for the low memory linear map */ MAPPING_BEYOND_END = \ - PAGE_TABLE_SIZE(((1<<32) - __PAGE_OFFSET) >> PAGE_SHIFT) << PAGE_SHIFT + PAGE_TABLE_SIZE((1<<20) - (__PAGE_OFFSET >> PAGE_SHIFT)) << PAGE_SHIFT
/* * Worst-case size of the kernel mapping we need to make: = = =
Before:
#5 [0000010000 - 0000011000] PGTABLE ==> [0000010000 - 0000011000] #6 [0000011000 - 0000015000] BOOTMAP ==> [0000011000 - 0000015000] After:
#5 [0000010000 - 000007d000] PGTABLE ==> [0000010000 - 000007d000] #6 [000007d000 - 0000081000] BOOTMAP ==> [000007d000 - 0000081000] Someone who knows mm check which is the reasonable value please.
Mike
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