On Wed, Jun 16, 2004 at 10:04:46AM -0700, Jun Sun wrote:
> On Wed, Jun 16, 2004 at 02:11:49PM +0200, Vojtech Pavlik wrote:
> > On Tue, Jun 15, 2004 at 08:56:11PM -0700, Andrew Morton wrote:
> > > > I found this problem on a MIPS machine. The problem is
> > > > likely to happen on other register-rich RISC arches too.
> > > >
> > > > cmdcnt needs to be volatile since it is modified by
> > > > irq routine and read by normal process context.
> > >
> > > volatile is not the preferred way to fix this up. This points at either a
> > > locking error in the psmouse driver or a missing "memory" thingy in the
> > > mips port somewhere.
> > >
> > > Please describe the bug which led to this patch. Where was it getting
> > > stuck?
> > My current BK tree has this fixed using atomic bitfields, which do
> > compilation and memory barriers. I plan to sync it to Linus post 2.6.7.
> Can you post the patch here? I am sure many people are eagerly waiting
> for the right fix. Plus there will be extra pairs of eyes to exam the fix.
Sure. Here it is.
SuSE Labs, SuSE CR
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