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| author |   Hugh Dickins <hughd@google.com> | 2020-04-20 18:14:07 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-21 11:11:55 -0700 |
| commit | 0783ac95b4a09a18e702c8359053762649b34c94 (patch) | |
| tree | 22621a2d886c9d2639e5f89b06ed9116f7608cf5 /mm | |
| parent | mm/ksm: fix NULL pointer dereference when KSM zero page is enabled (diff) | |
| download | wireguard-linux-0783ac95b4a09a18e702c8359053762649b34c94.tar.xz wireguard-linux-0783ac95b4a09a18e702c8359053762649b34c94.zip | |
mm/shmem: fix build without THP
Some optimizers don't notice that shmem_punch_compound() is always true
(PageTransCompound() being false) without CONFIG_TRANSPARENT_HUGEPAGE==y.
Use IS_ENABLED to help them to avoid the BUILD_BUG inside HPAGE_PMD_NR.
Fixes: 71725ed10c40 ("mm: huge tmpfs: try to split_huge_page() when punching hole")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2004142339170.10035@eggly.anvils
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/shmem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index d722eb830317..1d3242026219 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -952,7 +952,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend, VM_BUG_ON_PAGE(PageWriteback(page), page); if (shmem_punch_compound(page, start, end)) truncate_inode_page(mapping, page); - else { + else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { /* Wipe the page and don't get stuck */ clear_highpage(page); flush_dcache_page(page); |