[RFC][PATCH 2/2] kexec: Export PG_hwpoison flag into vmcoreinfo

[mitsuhiro.tanino.gm@xxxxxxxxxxx (Mitsuhiro Tanino)]

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 new "-p" option into "makedumpfile" to
exclude hwpoison page from vmcore dump.
In order to introduce this feature, PG_hwpoison flag have
to export into vmcoreinfo.

Signed-off-by: Mitsuhiro Tanino <mitsuhiro.tanino.gm at hitachi.com>
---
 kernel/kexec.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 0668d58..0d5d6bc 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1513,6 +1513,9 @@ static int __init crash_save_vmcoreinfo_init(void)
        VMCOREINFO_NUMBER(PG_lru);
        VMCOREINFO_NUMBER(PG_private);
        VMCOREINFO_NUMBER(PG_swapcache);
+#ifdef CONFIG_MEMORY_FAILURE
+       VMCOREINFO_NUMBER(PG_hwpoison);
+#endif

        arch_crash_save_vmcoreinfo();
        update_vmcoreinfo_note();
--
1.7.10.1