On Thu, Sep 11, 2008 at 04:00:08PM -0700, Jay Lan wrote: > Currently a memory segment in memory map with attribute of EFI_MEMORY_UC > is denoted as "System RAM" in /proc/iomem, while memory of attribute > (EFI_MEMORY_WB|EFI_MEMORY_UC) is also labeled the same. > > The kexec utility then includes uncached memory as part of vmcore. The > kdump kernel MCA'ed when it tries to save the vmcore to a disk. A normal > "cached" access may cause MCAs. > > This patch would label memory with attribute of EFI_MEMORY_UC only as > "Uncached RAM" so that kexec would know not to include it in the vmcore. > I will submit a separate kexec-tools patch to the kexec list. > > Signed-off-by: Jay Lan <jlan at sgi.com> Hi Jay, I've taken a look on an RX2620, Tiger2 and Tiger4 and none of these machines have EFI memory regions that are covered by this new check. That is, any regions with the EFI_MEMORY_UC bit set in the attribute either also have other attibute bits set, or are of a type not covered by this. I strongly suspect that this is not a problem, but I wanted to bring it to your attention anyway. I can provide more detailed EFI information from any or all of these machines if you need it. With regards to the kexec-tools portion of this patch, it looks fine to me and I don't think there will be any problem in merging it if/when the kernel portion is accepted. -- Simon Horman VA Linux Systems Japan K.K., Sydney, Australia Satellite Office H: www.vergenet.net/~horms/ W: www.valinux.co.jp/en
