revert "s390/mm: change HPAGE_SHIFT type to int"
authorDominik Dingel <dingel@linux.vnet.ibm.com>
Fri, 17 Jul 2015 23:23:31 +0000 (16:23 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 17 Jul 2015 23:39:52 +0000 (16:39 -0700)
commitad4f99e888192e53d463cab75075e88e65ad7d50
treecd8a3ebd7444c87116e383a3399ea62b24d601c0
parent04ea1e91f85615318ea91ce8ab50cb6a01ee4005
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>
arch/s390/include/asm/page.h
arch/s390/mm/pgtable.c