Re: [PATCH] x86/mm, mm/hwpoison: Fix the unmap kernel 1:1 pages check condition

Greg KH
2022-02-09T13:11:59Z

On Mon, Feb 07, 2022 at 10:20:28PM -0500, luofei wrote:
> [ Upstream commit fd0e786d9d09024f67bd71ec094b110237dc3840 ]
>
> This commit solves the problem of unmap kernel 1:1 pages
> unconditionally, it appears in Linus's tree 4.16 and later
> versions, and is backported to 4.14.x and 4.15.x stable branches.
>
> But the backported patch has its logic reversed when calling
> memory_failure() to determine whether it needs to unmap the
> kernel page. Only when memory_failure() returns successfully,
> the kernel page can be unmapped.
>
> Signed-off-by: luofei <luofei@unicloud.com>
> Cc: stable@vger.kernel.org #v4.14.x
> Cc: stable@vger.kernel.org #v4.15.x
> ---
> arch/x86/kernel/cpu/mcheck/mce.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

Thanks, now queued up.

greg k-h