linux-kernel - [PATCH] kexec: export PG

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Date:   Tue, 10 Apr 2018 16:13:45 +0200
From:   Petr Tesarik <ptesarik@...e.cz>
To:     Dave Young <dyoung@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Xunlei Pang <xlpang@...hat.com>, Baoquan He <bhe@...hat.com>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Marc-André Lureau" <marcandre.lureau@...hat.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] kexec: export PG_swapbacked to VMCOREINFO

Since commit 6326fec1122cde256bd2a8c63f2606e08e44ce1d 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.

Signed-off-by: Petr Tesarik <ptesarik@...e.com>
---
 kernel/crash_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index a93590cdd9e1..f7674d676889 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -454,6 +454,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 	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);
-- 
2.13.6