On Sun, Nov 04, 2012 at 05:35:06PM +0000, Matt Fleming wrote: > From: Matt Fleming <matt.fleming@xxxxxxxxx> > > We've started getting reports of users seeing Machine Check Exceptions > when booting their Samsung laptops in UEFI mode, > > https://bugzilla.kernel.org/show_bug.cgi?id=47121 > > This module seems to be the culprit as it's grovelling around in the > 0xf0000 region which has no mapping in either the e820 or EFI memory > maps on the affected machines. So, does this mean that if we try to ioremap a memory location in the kernel, like this driver is, it will not fail, but, when accessing the memory, bad things happen? That's not good, shouldn't the call to ioremap_nocache() have failed originally? That sounds like a core EFI/platform bug here, and one that you might run into other places. Shouldn't fixing that be the real fix? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
