From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Hildenbrand Subject: [PATCH RFC 3/6] kexec: export PG_offline to VMCOREINFO Date: Wed, 14 Nov 2018 22:17:01 +0100 Message-ID: <20181114211704.6381-4-david@redhat.com> References: <20181114211704.6381-1-david@redhat.com> Return-path: In-Reply-To: <20181114211704.6381-1-david@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, devel@linuxdriverproject.org, linux-fsdevel@vger.kernel.org, linux-pm@vger.kernel.org, xen-devel@lists.xenproject.org, David Hildenbrand , Andrew Morton , Dave Young , "Kirill A. Shutemov" , Baoquan He , Omar Sandoval , Arnd Bergmann , Matthew Wilcox , Michal Hocko , "Michael S. Tsirkin" List-Id: linux-pm@vger.kernel.org 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 Cc: Dave Young Cc: "Kirill A. Shutemov" Cc: Baoquan He Cc: Omar Sandoval Cc: Arnd Bergmann Cc: Matthew Wilcox Cc: Michal Hocko Cc: "Michael S. Tsirkin" Signed-off-by: David Hildenbrand --- 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