The patch titled
Subject: mm/page_alloc: restrict and formalize compound_page_dtors[]
has been added to the -mm tree. Its filename is
mm-page_alloc-restrict-and-formalize-compound_page_dtors.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-restrict-and-formalize-compound_page_dtors.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-restrict-and-formalize-compound_page_dtors.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: mm/page_alloc: restrict and formalize compound_page_dtors[]
Restrict elements in compound_page_dtors[] array per NR_COMPOUND_DTORS and
explicitly position them according to enum compound_dtor_id. This
improves protection against possible misalignment between
compound_page_dtors[] and enum compound_dtor_id later on.
Link: http://lkml.kernel.org/r/1589795958-19317-1-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 2 +-
mm/page_alloc.c | 10 +++++-----
2 files changed, 6 insertions(+), 6 deletions(-)
--- a/include/linux/mm.h~mm-page_alloc-restrict-and-formalize-compound_page_dtors
+++ a/include/linux/mm.h
@@ -859,7 +859,7 @@ enum compound_dtor_id {
#endif
NR_COMPOUND_DTORS,
};
-extern compound_page_dtor * const compound_page_dtors[];
+extern compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS];
static inline void set_compound_page_dtor(struct page *page,
enum compound_dtor_id compound_dtor)
--- a/mm/page_alloc.c~mm-page_alloc-restrict-and-formalize-compound_page_dtors
+++ a/mm/page_alloc.c
@@ -302,14 +302,14 @@ const char * const migratetype_names[MIG
#endif
};
-compound_page_dtor * const compound_page_dtors[] = {
- NULL,
- free_compound_page,
+compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = {
+ [NULL_COMPOUND_DTOR] = NULL,
+ [COMPOUND_PAGE_DTOR] = free_compound_page,
#ifdef CONFIG_HUGETLB_PAGE
- free_huge_page,
+ [HUGETLB_PAGE_DTOR] = free_huge_page,
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- free_transhuge_page,
+ [TRANSHUGE_PAGE_DTOR] = free_transhuge_page,
#endif
};
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-page_alloc-restrict-and-formalize-compound_page_dtors.patch
arm64-mm-drop-__have_arch_huge_ptep_get.patch
mm-hugetlb-define-a-generic-fallback-for-is_hugepage_only_range.patch
mm-hugetlb-define-a-generic-fallback-for-arch_clear_hugepage_flags.patch
powerpc-mm-drop-platform-defined-pmd_mknotpresent.patch
mm-thp-rename-pmd_mknotpresent-as-pmd_mknotvalid.patch
mm-thp-rename-pmd_mknotpresent-as-pmd_mkinvalid-v2.patch
x86-mm-define-mm_p4d_folded.patch
mm-debug-add-tests-validating-architecture-page-table-helpers.patch
mm-debug-add-tests-validating-architecture-page-table-helpers-v17.patch
mm-debug-add-tests-validating-architecture-page-table-helpers-v18.patch
