Subject: Re: how to avoid re-ordering?
To: YAMAMOTO Takashi <email@example.com>
From: Luke Mewburn <firstname.lastname@example.org>
Date: 12/17/2001 12:16:30
On Mon, Dec 17, 2001 at 05:19:59AM +0900, YAMAMOTO Takashi wrote:
> From: Jason R Thorpe <email@example.com>
> > > From: YAMAMOTO Takashi <firstname.lastname@example.org>
> > > > I noticed that spl*/splx are inlined and re-orderd
> > > > with "-O3 -march=pentium", and it produce bad codes as a result.
> > > > I actually experienced panics due to this.
> > >
> > > I'll commit attached patch some days later if no objection.
> > > thanks.
> > Should't we just declare "cpl" as __volatile?
> cpl is already volatile, isn't it?
> am I missing something important?
(Note: I am not a gcc guru.)
What if ncpl or ocpl (local variables to the appropriate functions)
are marked volatile as well, because as far as I can tell, it's the
reordering of access to those variables which is what's causing the
problem, not the access to the volatile cpl.