Re: [PATCH 0/24] make atomic_read() behave consistently across allarchitectures

From: Stefan Richter
Date: Wed Aug 15 2007 - 12:11:42 EST


Herbert Xu wrote:
> On Wed, Aug 15, 2007 at 08:05:38PM +0530, Satyam Sharma wrote:
>>> I don't know if this here is affected:

[...something like]
b = atomic_read(a);
for (i = 0; i < 4; i++) {
msleep_interruptible(63);
c = atomic_read(a);
if (c != b) {
b = c;
i = 0;
}
}

> Nope, we're calling schedule which is a rather heavy-weight
> barrier.

How does the compiler know that msleep() has got barrier()s?
--
Stefan Richter
-=====-=-=== =--- -====
http://arcgraph.de/sr/
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