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From: Luca Barbieri <luca@luca-barbieri.com>
To: hpa@zytor.com
Cc: mingo@elte.hu, a.p.zijlstra@chello.nl, akpm@linux-foundation.org,
       linux-kernel@vger.kernel.org, Luca Barbieri <luca@luca-barbieri.com>
Subject: [PATCH 0/4] x86-32: improve atomic64_t functions (v3, for tip/x86/asm)
Date: Wed, 24 Feb 2010 10:54:21 +0100
Message-Id: <1267005265-27958-1-git-send-email-luca@luca-barbieri.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1805
Lines: 44

Changes in v3:
- Dropped alternatives CALL patch because tip/x86/asm already had that
  functionality
- Patch atomic64_32.h instead of atomic_32.h

Changes in v2:
- 386/486 is supported with a custom assembly implementation, the generic
  implementation is no longer used/modified
- dropped SSE code
- changed CALL alternative code to use a custom alternative type:
  insn parser no longer used
- several implementation improvements
- several formatting/style improvements
- merged 386 support into main patch

This patchset improves the atomic64_t functions on x86-32.
It also includes a testsuite that has been used to test this functionality
and can test any atomic64_t implementation.

It offers the following improvements:
1. Better code due to hand-written assembly (e.g. use of the ZF flag)
2. All atomic64 functions implemented
3. Support for 386/486 due to the ability to alternatively use either
   the cmpxchg8b assembly implementation or the 386 cli/popf assembly one

The first patch adds functionality to the alternatives system to support
the new atomic64_t code.
A patch that improves cmpxchg64() using that functionality is also included.

To test this code, enable CONFIG_ATOMIC64_SELFTEST, compile for 386 and
boot normally and with "clearcpuid=8".

You should receive a message stating that the atomic64 test passed,
along with the selected configuration.

386/486 SMP is not supported, following existing practice, but the code
is structured to allow to very easily add such support.

Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
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