Ww5W8JS8DYJZUgKnvcjKVr/hz5h6Ltl31/z21boDYgiH jTy3vPBWCKclM8hcQOuxdzUTMgIy4OUqK0lDhFbOLgybzHBINqtpN0XNQix9OZ7SOxxZ63sH/exO9 v1KTtU2w==; Received: from 2001-1c00-8d85-5700-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:5700:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vSwOz-0000000Bm12-3ria; Tue, 09 Dec 2025 12:01:10 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 5B81130045C; Tue, 09 Dec 2025 13:56:27 +0100 (CET) Date: Tue, 9 Dec 2025 13:56:27 +0100 From: Peter Zijlstra To: Heiko Carstens Cc: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Mark Rutland , Arnd Bergmann , Jens Remus , Stefan Schulze Frielinghaus , Juergen Christ , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: Re: [PATCH 0/9] s390: Exception based WARN() / WARN_ONCE() Message-ID: <20251209125627.GG3707837@noisy.programming.kicks-ass.net> References: <20251209121701.1856271-1-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251209121701.1856271-1-hca@linux.ibm.com> X-DKIM: signer='infradead.org' status='pass' reason='' DKIMCheck: Server passes DKIM test, 0 Spam score X-Spam-Score: 0.4 (/) X-Spam-Report: Spam detection software, running on the system "witcher.mxrouting.net", has performed the tests listed below against this email. Information: https://mxroutedocs.com/directadmin/spamfilters/ --- Content analysis details: (0.4 points) --- pts rule name description ---- ---------------------- ----------------------------------------- 0.0 RCVD_IN_DNSWL_BLOCKED RBL: ADMINISTRATOR NOTICE: The query to DNSWL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#DnsBlocklists-dnsbl-block for more information. [104.64.211.4 listed in list.dnswl.org] 1.5 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level mail domains are different 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -1.0 MAILING_LIST_MULTI Multiple indicators imply a widely-seen list manager SpamTally: Final spam score: 4 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. 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