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authorAtsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>2014-07-30 19:08:39 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-07-30 20:16:13 -0400
commit8f1d26d0e59b9676587c54578f976709b625d6e9 (patch)
tree958c513631bd5419175d7a156268e0425b07cdcc /include/linux/hugetlb.h
parent75325189c9e4df5f67eec5ec5b0d90759084887b (diff)
kexec: export free_huge_page to VMCOREINFO
PG_head_mask was added into VMCOREINFO to filter huge pages in b3acc56bfe1 ("kexec: save PG_head_mask in VMCOREINFO"), but makedumpfile still need another symbol to filter *hugetlbfs* pages. If a user hope to filter user pages, makedumpfile tries to exclude them by checking the condition whether the page is anonymous, but hugetlbfs pages aren't anonymous while they also be user pages. We know it's possible to detect them in the same way as PageHuge(), so we need the start address of free_huge_page(): int PageHuge(struct page *page) { if (!PageCompound(page)) return 0; page = compound_head(page); return get_compound_page_dtor(page) == free_huge_page; } For that reason, this patch changes free_huge_page() into public to export it to VMCOREINFO. Signed-off-by: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp> Acked-by: Baoquan He <bhe@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/hugetlb.h')
-rw-r--r--include/linux/hugetlb.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 255cd5cc0754..a23c096b3080 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -80,6 +80,7 @@ int dequeue_hwpoisoned_huge_page(struct page *page);
80bool isolate_huge_page(struct page *page, struct list_head *list); 80bool isolate_huge_page(struct page *page, struct list_head *list);
81void putback_active_hugepage(struct page *page); 81void putback_active_hugepage(struct page *page);
82bool is_hugepage_active(struct page *page); 82bool is_hugepage_active(struct page *page);
83void free_huge_page(struct page *page);
83 84
84#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE 85#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
85pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud); 86pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);