Re: WARNING: fs/proc/generic.c:173 __xlate_proc_name

[Alexey Dobriyan]

On Sun, Feb 25, 2024 at 11:47:30AM +0100, Stefan Wahren wrote:
> Hi Alexey,
> 
> Am 25.02.24 um 11:37 schrieb Alexey Dobriyan:
> > > WARNING: CPU: 0 PID: 429 at fs/proc/generic.c:173
> > > __xlate_proc_name+0x78/0x98 name 'R1/S1'
> > proc_mkdir() didn't find 'R1' directory.
> > 
> > In other words, you can't have slashes in irq names.
> we already came to the point in the discussion before (link in my last
> mail). The problem is no libgpiod user (userspace) is aware of this.

Changing '/' to '-' or '.' should be OK. Whatever you do, don't change
to '!' because it will make these paths annoying to use in bash.

> So the next question is where it should be fixed?

libgpiod silently weren't getting directory inside /proc/irq/${irq}
and nobody noticed until now.

I think returning error may be too harsh but replacing characters is not.

> Sorry, i took my original message because posting the last message to
> linux-fsdevel without context would be pointless.