linux-kernel - [PATCH 0/4] s390/mm: Fixup hugepage sw-emulated code removal

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Date:	Fri,  3 Jul 2015 14:46:05 +0200
From:	Dominik Dingel <dingel@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, Dominik Dingel <dingel@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	linux-s390@...r.kernel.org, linux-mm@...ck.org,
	Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: [PATCH 0/4] s390/mm: Fixup hugepage sw-emulated code removal

Heiko noticed that the current check for hugepage support on s390 is a little bit to
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().

Thanks
    Dominik

Dominik Dingel (4):
  Revert "s390/mm: change HPAGE_SHIFT type to int"
  Revert "s390/mm: make hugepages_supported a boot time decision"
  mm: hugetlb: allow hugepages_supported to be architecture specific
  s390/hugetlb: add hugepages_supported define

 arch/s390/include/asm/hugetlb.h |  1 +
 arch/s390/include/asm/page.h    |  8 ++++----
 arch/s390/kernel/setup.c        |  2 --
 arch/s390/mm/pgtable.c          |  2 --
 include/linux/hugetlb.h         | 17 ++++++++---------
 5 files changed, 13 insertions(+), 17 deletions(-)

-- 
2.3.8

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