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xen-devel
Re: [Xen-devel] [PATCH] atomic_read
On 11 Mar 2005, at 16:52, Hollis Blanchard wrote:
Ahh... I assumed asm-x86/atomic.h was simply out of date, but I see
now that you've modified it yourself. So _atomic_* should now be
considered part of the arch->common interface? Further, it should
actually *not* be an atomic access at all? Of course it will be faster
("better-quality") code if it's not assumed to be an atomic access...
in which case isn't the naming a little misleading?
I noticed this problem because linux/include/asm-ppc64/atomic.h
doesn't have _atomic_* functions. I guess this means I will need to
implement my own non-atomic _atomic_* functions?
We only define single-word get/set macros (_atomic_read/_atomic_set).
These are trivially atomic on any architecture we care about. In fact
we only use them to set up local variables prior to pushing out to a
shared atomic variable, so the atomicity doesn't really matter to us;
it's a bonus.
-- Keir
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