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authorRusty Russell <rusty@rustcorp.com.au>2008-01-01 21:48:36 +1100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-01 11:30:35 -0800
commit476c6c11a9ee4610ff0e4941e3851729f7caf062 (patch)
tree19dc184b4a01f4c4984e347cf2b875a104478f66
parente697789d64f8748cb219d7f5c413c512953802cc (diff)
downloadlinux-stericsson-476c6c11a9ee4610ff0e4941e3851729f7caf062.tar.gz
fix lguest rmmod "bad pgd"
After 17d57a9206b4de6ad082ac9f2d2346985abbd2aa ("x86: fix x86-32 early fixmap initialization.") removing lg.ko caused a printk from vunmap: mm/memory.c:115: bad pgd 004b3027. On the second use after module load, the kernel crashes. This fixes the immediate problem (accessed and dirty bits not set as expected in pmd_none_or_clear_bad). I can't see why this would cause a crash, but I haven't been able to reproduce it once this is applied. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/x86/kernel/head_32.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index ac0637a6d71c..fbad51fce672 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -196,7 +196,7 @@ default_entry:
/* Do an early initialization of the fixmap area */
movl $(swapper_pg_dir - __PAGE_OFFSET), %edx
movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax
- addl $0x007, %eax /* 0x007 = PRESENT+RW+USER */
+ addl $0x67, %eax /* 0x67 == _PAGE_TABLE */
movl %eax, 4092(%edx)
xorl %ebx,%ebx /* This is the boot CPU (BSP) */