Re: [PATCH 0/9] s390: Exception based WARN() / WARN_ONCE()

[Peter Zijlstra]

On Tue, Dec 09, 2025 at 01:16:52PM +0100, Heiko Carstens wrote:
> Use the generic infrastructure introduced by Peter Zijlstra [1] to implement
> an exception based WARN() and WARN_ONCE() similar to x86.
> 
> Due to some compiler oddities on s390 this requires to raise the minimum gcc
> version to 9. Maybe there are ways to avoid this, but I failed to find a
> working solution. Details are in the patch descriptions.
> 
> Just posting this now to also get some compile bot testing, since I'm afraid
> there might be some compiler version / config option around where even this
> new approach breaks.
> 
> Peter, since you were wondering: your generic infrastructure pieces work very
> nice. Looking at the x86 and s390 implementation: it might be possible to make
> things even more generic since both __WARN_printf(), and WARN_ONCE() are
> identical; it looks like only __WARN_print_arg() needs to be provided.

Nice! and yeah, perhaps we can unify that later.