[PATCH RFC 3/6] kexec: export PG_offline to VMCOREINFO
David Hildenbrand
david at redhat.com
Wed Nov 14 21:17:01 UTC 2018
Let's export PG_offline via PAGE_OFFLINE_MAPCOUNT_VALUE, so
makedumpfile can directly skip pages that are logically offline and the
content therefore stale.
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Dave Young <dyoung at redhat.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov at linux.intel.com>
Cc: Baoquan He <bhe at redhat.com>
Cc: Omar Sandoval <osandov at fb.com>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Matthew Wilcox <willy at infradead.org>
Cc: Michal Hocko <mhocko at suse.com>
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Signed-off-by: David Hildenbrand <david at redhat.com>
---
kernel/crash_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 933cb3e45b98..093c9f917ed0 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -464,6 +464,8 @@ static int __init crash_save_vmcoreinfo_init(void)
VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
#ifdef CONFIG_HUGETLB_PAGE
VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
+#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
+ VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
#endif
arch_crash_save_vmcoreinfo();
--
2.17.2
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