Messages in this thread | | | From | Luca Barbieri <> | Subject | [PATCH 0/10] x86-32: improve atomic64_t functions | Date | Wed, 17 Feb 2010 12:42:32 +0100 |
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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, efficiently 3. Support for 386/486 due to the ability to alternatively use either the cmpxchg8b based implementation or the generic implementation 4. Use of SSE, if available, for atomic64_read and atomic64_set
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, with "clearcpuid=25" and with "clearcpuid=8 clearcpuid=25".
You should receive a message stating that the atomic64 test passed, along with the selected configuration.
Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
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