summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorHugh Dickins <hughd@google.com>2020-04-20 18:14:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-21 11:11:55 -0700
commit0783ac95b4a09a18e702c8359053762649b34c94 (patch)
tree22621a2d886c9d2639e5f89b06ed9116f7608cf5
parent56df70a63ed5d989c1d36deee94cae14342be6e9 (diff)
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>
-rw-r--r--mm/shmem.c2
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);