On Thu, Dec 22, 2005 at 12:41:47PM +0100, Ingo Molnar wrote:
> this is the -V4 of the mutex subsystem patch-queue. It consists of the
> following patches:
>
> add-atomic-xchg.patch
> add-atomic-call-func-i386.patch
> add-atomic-call-func-x86_64.patch
> add-atomic-call-wrappers-rest.patch
> mutex-core.patch
> mutex-switch-arm-to-xchg.patch
> mutex-debug.patch
> mutex-debug-more.patch
> xfs-mutex-namespace-collision-fix.patch
>
> the patches are against Linus' latest GIT tree, and they should work
> fine on every Linux architecture.
>
> Changes since -V3:
>
> - imlemented an atomic_xchg() based mutex implementation. It integrated
> pretty nicely into the generic code, and most of the code is still
> shared.
>
> - added __ARCH_WANT_XCHG_BASED_ATOMICS: if an architecture defines
> this then the generic mutex code will switch to the atomic_xchg()
> implementation.
>
> This should be conceptually equivalent to the variant Nicolas Pitre
> posted - Nicolas, could you check out this one? It's much easier to
> provide this in the generic implementation, and the code ends up
> looking cleaner.
>
> - eliminated ARCH_IMPLEMENTS_MUTEX_FASTPATH: there's no need for
> architectures to override the generic code anymore, with the
> introduction of __ARCH_WANT_XCHG_BASED_ATOMICS.
>
> - ARM: enable __ARCH_WANT_XCHG_BASED_ATOMICS.
I must admit I really really hat __ARCH_ stuff if we can avoid it.
An <asm/mutex.h> that usually includes two asm-generic variants is probably
a much better choice.
Actually just havign asm/mutex.h implement the faspath per-arch and get
rid of all the oddball atomic.h additions would be even better. While
this means we need per-arch code it also means the code is a lot easier
understandable, and we don't add odd public APIs.
-
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