From: Petr Tesarik <ptesarik@xxxxxxx>
Subject: kexec: export PG_swapbacked to VMCOREINFO
Since commit 6326fec1122cd ("mm: Use owner_priv bit for PageSwapCache,
valid when PageSwapBacked"), PG_swapcache is an alias for PG_owner_priv_1,
which may be also used for other purposes. To know whether the bit indeed
has the PG_swapcache meaning, it is necessary to check PG_swapbacked,
hence this bit must be exported.
Link: http://lkml.kernel.org/r/20180410161345.142e142d@xxxxxxxxxxxxxxx
Signed-off-by: Petr Tesarik <ptesarik@xxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Xunlei Pang <xlpang@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: "Marc-Andr Lureau" <marcandre.lureau@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/crash_core.c | 1 +
1 file changed, 1 insertion(+)
diff -puN kernel/crash_core.c~kexec-export-pg_swapbacked-to-vmcoreinfo kernel/crash_core.c
--- a/kernel/crash_core.c~kexec-export-pg_swapbacked-to-vmcoreinfo
+++ a/kernel/crash_core.c
@@ -454,6 +454,7 @@ static int __init crash_save_vmcoreinfo_
VMCOREINFO_NUMBER(PG_lru);
VMCOREINFO_NUMBER(PG_private);
VMCOREINFO_NUMBER(PG_swapcache);
+ VMCOREINFO_NUMBER(PG_swapbacked);
VMCOREINFO_NUMBER(PG_slab);
#ifdef CONFIG_MEMORY_FAILURE
VMCOREINFO_NUMBER(PG_hwpoison);
_
--
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