From: Paul Cassella <cassella@cray.com>
Date: Wed, 6 Aug 2014 23:07:24 +0000 (-0700)
Subject: mm: describe mmap_sem rules for __lock_page_or_retry() and callers
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~137^2~113
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a95f3cf7b33d66fa64727cff8cd2f2a9d09f335;p=pandora-kernel.git

mm: describe mmap_sem rules for __lock_page_or_retry() and callers

Add a comment describing the circumstances in which
__lock_page_or_retry() will or will not release the mmap_sem when
returning 0.

Add comments to lock_page_or_retry()'s callers (filemap_fault(),
do_swap_page()) noting the impact on VM_FAULT_RETRY returns.

Add comments on up the call tree, particularly replacing the false "We
return with mmap_sem still held" comments.

Signed-off-by: Paul Cassella <cassella@cray.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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