Messages in this thread | | | From | Luca Barbieri <> | Subject | [PATCH 0/5] x86-32: improve atomic64_t functions (v2) | Date | Fri, 19 Feb 2010 18:26:39 +0100 |
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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 patches add 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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