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Subject[PATCH] mm: Fix BUILD_BUG assertion in pmdp_clear_flush_young()
From: David Daney <>

It has been reported that when building for sh:

mm/pgtable-generic.c: In function 'pmdp_clear_flush_young':
mm/pgtable-generic.c:76: error: call to '__build_bug_failed' declared with attribute error: BUILD_BUG failed

Adding some ugle #ifdeffery will probably fix this issue.

Signed-off-by: David Daney <>

This is completely untested, but may be the best fix for this. Linus
and others have expressed a dislike for using BUG() to detect what
should be dead code paths at runtime, but it seems to be the state of
the art here.

mm/pgtable-generic.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index eb663fb..73784c8 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -70,7 +70,7 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
int young;

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