The patch titled
Subject: mm/shmem: fix build without THP
has been added to the -mm tree. Its filename is
mm-shmem-fix-build-without-thp.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-shmem-fix-build-without-thp.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-shmem-fix-build-without-thp.patch
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------------------------------------------------------
From: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: 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=3Dy:
use IS_ENABLED to help them to avoid the BUILD_BUG inside HPAGE_PMD_NR.
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.2004142339170.10035@eggly.anvils
Fixes: 71725ed10c40 ("mm: huge tmpfs: try to split_huge_page() when punchin=
g hole")
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Tested-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/shmem.c~mm-shmem-fix-build-without-thp
+++ a/mm/shmem.c
@@ -952,7 +952,7 @@ static void shmem_undo_range(struct inod
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);
_
Patches currently in -mm which might be from hughd@xxxxxxxxxx are
mm-shmem-fix-build-without-thp.patch
