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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>
This commit is contained in:
Benjamin Herrenschmidt 2008-07-31 00:07:30 -07:00 committed by Linus Torvalds
parent c6de002617
commit 0ef89d25d3
1 changed files with 6 additions and 1 deletions
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7
mm/hugetlb.c
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@ -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;