UPSTREAM: pstore/zone: Use GFP_ATOMIC to allocate zone buffer

There is a case found when triggering a panic_on_oom, pstore fails to dump
kmsg. Because psz_kmsg_write_record can't get the new buffer.

Handle this by using GFP_ATOMIC to allocate a buffer at lower watermark.

Bug: 254441685
Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Fixes: 335426c6 ("pstore/zone: Provide way to skip "broken" zone for MTD devices")
Cc: WeiXiong Liao <gmpy.liaowx@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/CAJRQjofRCF7wjrYmw3D7zd5QZnwHQq+F8U-mJDJ6NZ4bddYdLA@mail.gmail.com


(cherry picked from commit 99b3b837)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I1cec8ce5cdd4b6b752d0ab8d9ad09c07b13fc7dd