On 12/16/13 at 04:35pm, Matt Fleming wrote: > On Mon, 16 Dec, at 05:30:35PM, Dave Young wrote: > > kdump kernel will use memmap=exactmap kernel cmdline, but __va does not > > work in case memmap=exactmap, so let's always use ioremap_cache. > > > > Signed-off-by: Dave Young <dyoung@xxxxxxxxxx> > > --- > > arch/x86/kernel/kdebugfs.c | 35 +++++++++++------------------------ > > 1 file changed, 11 insertions(+), 24 deletions(-) > > Dave, I've no idea why this change is necessary from the commit log. Is > it required for kexec to function on EFI? Why does __va() not work in > the memmap=exactmap case? > During previous kdump tests I saw panics while reading the setup_data in debugfs. I thought it is caused by some unmapped addresses. At that time I also reproduced it by booting the non-kexec kernel with memmap=exact. Since you are asking about this I'm testing it again but I seems can not reproduce this problem any more, it's weird. I should dug more about it and save the panic messages. So let's drop this patch for now, I will keep an eye on this and address it later if I can find the problem again. -- Thanks Dave -- 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
