diff options
| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2015-07-17 16:23:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-07-17 16:39:52 -0700 |
| commit | ad4f99e888192e53d463cab75075e88e65ad7d50 (patch) | |
| tree | cd8a3ebd7444c87116e383a3399ea62b24d601c0 | |
| parent | 04ea1e91f85615318ea91ce8ab50cb6a01ee4005 (diff) | |
| download | lwn-ad4f99e888192e53d463cab75075e88e65ad7d50.tar.gz lwn-ad4f99e888192e53d463cab75075e88e65ad7d50.zip | |
revert "s390/mm: change HPAGE_SHIFT type to int"
Heiko noticed that the current check for hugepage support on s390 is a
little bit too harsh as systems which do not support will crash.
The reason is that pageblock_order can now get negative when we set
HPAGE_SHIFT to 0. To avoid all this and to avoid opening another can of
worms with enabling HUGETLB_PAGE_SIZE_VARIABLE I think it would be best
to simply allow architectures to define their own hugepages_supported().
This patch (of 4): revert commit cf54e2fce51c ("s390/mm: change
HPAGE_SHIFT type to int") in preparation.
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/s390/include/asm/page.h | 2 | ||||
| -rw-r--r-- | arch/s390/mm/pgtable.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index dd345238d9a7..0844b780c6a4 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -20,7 +20,7 @@ #include <asm/setup.h> #ifndef __ASSEMBLY__ -extern int HPAGE_SHIFT; +extern unsigned int HPAGE_SHIFT; #define HPAGE_SIZE (1UL << HPAGE_SHIFT) #define HPAGE_MASK (~(HPAGE_SIZE - 1)) #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 33082d0d101b..16154720bdb6 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -31,7 +31,7 @@ #define ALLOC_ORDER 2 #define FRAG_MASK 0x03 -int HPAGE_SHIFT; +unsigned int HPAGE_SHIFT; unsigned long *crst_table_alloc(struct mm_struct *mm) { |