From: Oleg Nesterov <oleg@redhat.com>
Date: Fri, 15 Jun 2012 15:43:36 +0000 (+0200)
Subject: uprobes: Change build_map_info() to try kmalloc(GFP_NOWAIT) first
X-Git-Tag: v3.6-rc1~167^2~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7a5bfb66b07f22d2429db776da7bb8b57bfb5cff;p=pandora-kernel.git

uprobes: Change build_map_info() to try kmalloc(GFP_NOWAIT) first

build_map_info() doesn't allocate the memory under i_mmap_mutex
to avoid the deadlock with page reclaim. But it can try
GFP_NOWAIT first, it should work in the likely case and thus we
almost never need the pre-alloc-and-retry path.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Link: http://lkml.kernel.org/r/20120615154336.GA9588@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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