kexec: export PG_hwpoison flag into vmcoreinfo

This patch exports a PG_hwpoison into vmcoreinfo when
CONFIG_MEMORY_FAILURE is defined.  "makedumpfile" needs to read
information of memory, such as 'mem_section', 'zone', 'pageflags' from
vmcore.

We introduce a function into "makedumpfile" to exclude hwpoison page from
vmcore dump.  In order to introduce this function, PG_hwpoison flag have
to export into vmcoreinfo.

Signed-off-by: Mitsuhiro Tanino <mitsuhiro.tanino.gm@hitachi.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Mitsuhiro Tanino <mitsuhiro.tanino.gm@hitachi.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/kexec.c b/kernel/kexec.c
index ea097ad7cc37..2348bd6ef2af 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1537,6 +1537,9 @@ static int __init crash_save_vmcoreinfo_init(void)
         VMCOREINFO_NUMBER(PG_private);
         VMCOREINFO_NUMBER(PG_swapcache);
         VMCOREINFO_NUMBER(PG_slab);
+#ifdef CONFIG_MEMORY_FAILURE
+        VMCOREINFO_NUMBER(PG_hwpoison);
+#endif
         VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
 
         arch_crash_save_vmcoreinfo();