diff options
Diffstat (limited to 'arch/x86/mm/extable.c')
| -rw-r--r-- | arch/x86/mm/extable.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c index 832b98f822be..fcd06f7526de 100644 --- a/arch/x86/mm/extable.c +++ b/arch/x86/mm/extable.c @@ -1,4 +1,4 @@ -#include <linux/module.h> +#include <linux/extable.h> #include <asm/uaccess.h> #include <asm/traps.h> #include <asm/kdebug.h> @@ -135,7 +135,12 @@ void __init early_fixup_exception(struct pt_regs *regs, int trapnr) if (early_recursion_flag > 2) goto halt_loop; - if (regs->cs != __KERNEL_CS) + /* + * Old CPUs leave the high bits of CS on the stack + * undefined. I'm not sure which CPUs do this, but at least + * the 486 DX works this way. + */ + if ((regs->cs & 0xFFFF) != __KERNEL_CS) goto fail; /* |
