From: Kautuk Consul <consul.kautuk@gmail.com>
Date: Thu, 31 May 2012 23:26:03 +0000 (-0700)
Subject: um/kernel/trap.c: port OOM changes to handle_page_fault()
X-Git-Tag: v3.5-rc1~21^2~76
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1cefe28f95da307287a05a6a0c10213f01055e2a;p=pandora-kernel.git

um/kernel/trap.c: port OOM changes to handle_page_fault()

Commit d065bd810b6d ("mm: retry page fault when blocking on disk
transfer") and commit 37b23e0525d3 ("x86,mm: make pagefault killable")
introduced changes into the x86 pagefault handler for making the page
fault handler retryable as well as killable.

These changes reduce the mmap_sem hold time, which is crucial during OOM
killer invocation.

Port these changes to um.

Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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