On Sun, Dec 27, 2015 at 2:09 AM, Borislav Petkov <bp@xxxxxxxxx> wrote: > On Sat, Dec 26, 2015 at 10:57:26PM -0800, Tony Luck wrote: >> ... will get the right value. Maybe this would still work out >> if the fixup is a 31-bit value plus a flag, but the external >> tool thinks it is a 32-bit value? I'd have to ponder that. > > I still fail to see why do we need to make it so complicated and can't > do something like: > > > fixup_exception: > ... > > #ifdef CONFIG_MCE_KERNEL_RECOVERY > if (regs->ip >= (unsigned long)__mcsafe_copy && > regs->ip <= (unsigned long)__mcsafe_copy_end) > run_special_handler(); > #endif > > and that special handler does all the stuff we want. And we pass > X86_TRAP* etc through fixup_exception along with whatever else we > need from the trap handler... > > Hmmm? You certainly can, but it doesn't scale well to multiple users of similar mechanisms. It also prevents you from using the same mechanism in anything that could be inlined, which is IMO kind of unfortunate. --Andy -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>