> Gee, thanks. I sat and wrote code side-by-side, and it looks like, even
> barriers
> won't fix anything, because they don't affect other CPUs.
?! The whole point of memory barriers is that they affect other CPUs.
Maybe you are thinking of compiler barriers?
> ->proc_fops is valid
On Fri, Feb 02, 2007 at 08:31:57AM +0100, Duncan Sands wrote:
> > I believe, barriers not needed, not now.
> > This scheme relies on the fact that remove_proc_entry() will be the only
> > place that will clear ->proc_fops and, once cleared, ->proc_fops will
> > never be resurrected. Clearing of ->
Hi Alexey,
> I believe, barriers not needed, not now.
>
> This scheme relies on the fact that remove_proc_entry() will be the only
> place that will clear ->proc_fops and, once cleared, ->proc_fops will
> never be resurrected. Clearing of ->proc_fops will eventually propagate
> to CPU doing first
Duncan Sands wrote:
> On Wednesday 31 January 2007 19:42:51 Alexey Dobriyan wrote:
> > On Wed, Jan 31, 2007 at 11:54:35AM +0100, Duncan Sands wrote:
> > > Can read_proc still be executing when remove_proc_entry returns?
> > >
> > > In my driver [*] I allocate some data and create a proc entry using
> I don't understand how this is supposed to work. Consider
>
> CPU1 CPU2
>
> atomic_inc(&dp->pde_users);
> if (dp->proc_fops)
> de->proc_fops = NULL;
> use_proc_fops <= BOOM
> if (
On Wednesday 31 January 2007 19:42:51 Alexey Dobriyan wrote:
> On Wed, Jan 31, 2007 at 11:54:35AM +0100, Duncan Sands wrote:
> > Can read_proc still be executing when remove_proc_entry returns?
> >
> > In my driver [*] I allocate some data and create a proc entry using
> > create_proc_entry. My re
On Wed, Jan 31, 2007 at 11:54:35AM +0100, Duncan Sands wrote:
> Can read_proc still be executing when remove_proc_entry returns?
>
> In my driver [*] I allocate some data and create a proc entry using
> create_proc_entry. My read method reads from my allocated data. When
> shutting down, I call r
Can read_proc still be executing when remove_proc_entry returns?
In my driver [*] I allocate some data and create a proc entry using
create_proc_entry. My read method reads from my allocated data. When
shutting down, I call remove_proc_entry and immediately free the data.
If some call to read_pr
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