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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2016-10-07 17:01:10 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-02-23 03:54:10 +0000 |
| commit | 4428f3bdd8fe8597be1c3580da8d051a0e43b906 (patch) | |
| tree | 8c5ca61aa7f8d21f7cc6e48c1b31d1684531d187 /include | |
| parent | 23ac701d18c482dcc353299d1b3aeaa1f44bdce6 (diff) | |
| download | linux-stable-4428f3bdd8fe8597be1c3580da8d051a0e43b906.tar.gz linux-stable-4428f3bdd8fe8597be1c3580da8d051a0e43b906.tar.bz2 linux-stable-4428f3bdd8fe8597be1c3580da8d051a0e43b906.zip | |
mm/hugetlb: check for reserved hugepages during memory offline
commit 082d5b6b60e9f25e1511557fcfcb21eedd267446 upstream.
In dissolve_free_huge_pages(), free hugepages will be dissolved without
making sure that there are enough of them left to satisfy hugepage
reservations.
Fix this by adding a return value to dissolve_free_huge_pages() and
checking h->free_huge_pages vs. h->resv_huge_pages. Note that this may
lead to the situation where dissolve_free_huge_page() returns an error
and all free hugepages that were dissolved before that error are lost,
while the memory block still cannot be set offline.
Fixes: c8721bbb ("mm: memory-hotplug: enable memory hotplug to handle hugepage")
Link: http://lkml.kernel.org/r/20160926172811.94033-3-gerald.schaefer@de.ibm.com
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Rui Teng <rui.teng@linux.vnet.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/hugetlb.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 62e94d2517bd..6bc75164e68f 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -396,8 +396,8 @@ static inline pgoff_t basepage_index(struct page *page) return __basepage_index(page); } -extern void dissolve_free_huge_pages(unsigned long start_pfn, - unsigned long end_pfn); +extern int dissolve_free_huge_pages(unsigned long start_pfn, + unsigned long end_pfn); static inline int hugepage_migration_supported(struct hstate *h) { #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION @@ -452,7 +452,7 @@ static inline pgoff_t basepage_index(struct page *page) { return page->index; } -#define dissolve_free_huge_pages(s, e) do {} while (0) +#define dissolve_free_huge_pages(s, e) 0 #define hugepage_migration_supported(h) 0 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, |