Re: [PATCH] fix race in mark_mounts_for_expiry()
From: David Howells
Date: Wed May 18 2005 - 06:02:12 EST
Miklos Szeredi <miklos@xxxxxxxxxx> 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.
David
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