Re: Why Semaphore Hardware-Dependent?

[David Howells <dhowells@redhat.com>]

Ralf Baechle <ralf@linux-mips.org> wrote:

> > Which arches do not support cmpxchg?
> 
> MIPS, Alpha - probably any pure RISC load/store architecture.

Some of these have LL/SC or equivalent instead, but ARM5 and before, FRV, M68K
before 68020 to name but a few.

And anything that implements CMPXCHG with spinlocks is a really bad candidate
for CMPXCHG-based rwsems.

David
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