From: Darren Hart <dvhltc@us.ibm.com>
Date: Thu, 12 Mar 2009 07:56:13 +0000 (-0700)
Subject: futex: clean up fault logic
X-Git-Tag: v2.6.30-rc1~629^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e4dc5b7a36a49eff97050894cf1b3a9a02523717;p=pandora-kernel.git

futex: clean up fault logic

Impact: cleanup

Older versions of the futex code held the mmap_sem which had to
be dropped in order to call get_user(), so a two-pronged fault
handling mechanism was employed to handle faults of the atomic
operations.  The mmap_sem is no longer held, so get_user()
should be adequate.  This patch greatly simplifies the logic and
improves legibility.

Build and boot tested on a 4 way Intel x86_64 workstation.
Passes basic pthread_mutex and PI tests out of
ltp/testcases/realtime.

Signed-off-by: Darren Hart <dvhltc@us.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <20090312075612.9856.48612.stgit@Aeon>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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