linux-kernel - [PATCH 0/3] special_mapping

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Message-ID: <20150621210725.GA18220@redhat.com>
Date:	Sun, 21 Jun 2015 23:07:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Hugh Dickins <hughd@...gle.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] special_mapping_fault() is broken

On 06/20, Oleg Nesterov wrote:
>
> Let me first send the changes which look "obviously correct" to me.
> Perhaps I'll send more patches on top of this later.

But lets also fix another unmap/remap bug before the cleanups...
This series doesn't depend on the previous mremap fixes.

special_mapping_fault() is absolutely broken. It seems it was always
wrong, but this didn't matter until vdso/vvar started to use more than
one page.

I am not sure about 1/3. As the changelog says the name is not very
accurate, and I do not really like the vma->fault != NULL check. But
I hope this can work, and we can change this helper later if needed.

Please review.

Oleg.

 include/linux/mm.h |    5 +++++
 mm/memory.c        |   13 ++++++-------
 mm/mmap.c          |   14 +++-----------
 3 files changed, 14 insertions(+), 18 deletions(-)

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