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 <[EMAIL PROTECTED]>
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -196,7 +196,7 @@ 11:
/* 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) */
_______________________________________________
Lguest mailing list
[email protected]
https://ozlabs.org/mailman/listinfo/lguest
