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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-31 00:07:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-01 12:46:41 -0700
commit0ef89d25d3e390dfa7c46772907951744a4067dc (patch)
tree768d97175d6df35408733f6fe40cf414b4ac75bd /mm/hugetlb.c
parentc6de002617c199f80f9a2a713dffc263bdc69b81 (diff)
downloadlwn-0ef89d25d3e390dfa7c46772907951744a4067dc.tar.gz
lwn-0ef89d25d3e390dfa7c46772907951744a4067dc.zip
mm/hugetlb: don't crash when HPAGE_SHIFT is 0
Some platform decide whether they support huge pages at boot time. On these, such as powerpc, HPAGE_SHIFT is a variable, not a constant, and is set to 0 when there is no such support. The patches to introduce multiple huge pages support broke that causing the kernel to crash at boot time on machines such as POWER3 which lack support for multiple page sizes. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d237a02eb228..28a2980ee435 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1283,7 +1283,12 @@ module_exit(hugetlb_exit);
static int __init hugetlb_init(void)
{
- BUILD_BUG_ON(HPAGE_SHIFT == 0);
+ /* Some platform decide whether they support huge pages at boot
+ * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
+ * there is no such support
+ */
+ if (HPAGE_SHIFT == 0)
+ return 0;
if (!size_to_hstate(default_hstate_size)) {
default_hstate_size = HPAGE_SIZE;