Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH] fix race in mark_mounts_for_expiry() | Date | Wed, 18 May 2005 11:59:50 +0100 |
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Miklos Szeredi <miklos@szeredi.hu> wrote:
> > There's still the problem of cmpxchg meddling in the internals of an > atomic_t. Is that OK? Will that work on all archs?
Probably. It might be worth defining an atomic_cmpxchg() op to formalise it though:
int atomic_cmpxchg(atomic_t *p, int old, int new);
The main reason for this is that atomic_t is mostly a 32-bit value, I think, and cmpxchg() may sometimes enforce a 64-bit value.
It can be made to work on PPC, PPC64, x86, x86_64, frv. I imagine it'll work on MIPS, sparc and alpha too without too much trouble. Dunno about the rest.
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