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mm/page_alloc: restrict and formalize compound_page_dtors[]

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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.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: http://lkml.kernel.org/r/1589795958-19317-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2020-06-03 15:59:17 -07:00 committed by Linus Torvalds
parent aa09259109
commit ae70eddd56
2 changed files with 6 additions and 6 deletions
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2
include/linux/mm.h
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@ -867,7 +867,7 @@ 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)

10
mm/page_alloc.c
View File

@ -302,14 +302,14 @@ const char * const migratetype_names[MIGRATE_TYPES] = {
#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
};