Re: [PATCH v1] mm/gup: remove (VM_)BUG_ONs

[John Hubbard]

On 7/24/25 3:56 AM, Lorenzo Stoakes wrote:
> On Thu, Jul 24, 2025 at 12:54:26PM +0200, Vlastimil Babka wrote:
> > On 6/9/25 11:57, Vlastimil Babka wrote:
> > > On 6/7/25 8:00 PM, John Hubbard wrote:
> > > > On 6/7/25 6:53 AM, Lorenzo Stoakes wrote:
> > > > The worst part is that if you go to reproduce a problem, you don't
> > > > see the next warning in the logs!! This is devastating, especially if
> > > > the site makes it hard to ask for a system reboot. (If you have
> > > > ~20,000 nodes in the cluster, a reboot is not a small affair.)
> > >
> > > Assuming you know how to reproduce the problem... I wonder if it would
> > > help if there was a way (sysctl?) to re-arm all the _ONCE warnings. It
> > > shouldn't be that hard hopefully?
> >
> > Oh hey it already exists, since 2017
> >
> > echo 1 > /sys/kernel/debug/clear_warn_once
>
> Ohhh! Nice!

WOW, how did I go all this time without knowing about that? It's just
what I always wanted! :)

thanks,
--
John Hubbard