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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4255d8f083asm4640243f8f.43.2025.10.02.11.48.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Oct 2025 11:48:26 -0700 (PDT) Date: Thu, 2 Oct 2025 19:47:34 +0100 From: David Laight To: Linus Torvalds Cc: Geert Uytterhoeven , Peter Zijlstra , Thomas Gleixner , Nathan Chancellor , LKML , kernel test robot , Russell King , linux-arm-kernel@lists.infradead.org, Christophe Leroy , Darren Hart , Davidlohr Bueso , =?UTF-8?B?QW5kcsOp?= Almeida , x86@kernel.org, Alexander Viro , Christian Brauner , Jan Kara , linux-fsdevel@vger.kernel.org Subject: Re: [patch V2a 2/6] kbuild: Disable CC_HAS_ASM_GOTO_OUTPUT on clang < version 17 Message-ID: <20251002194734.7cb2be8e@pumpkin> In-Reply-To: References: <20250916163004.674341701@linutronix.de> <20250916163252.100835216@linutronix.de> <20250916184440.GA1245207@ax162> <87ikhi9lhg.ffs@tglx> <87frcm9kvv.ffs@tglx> <20250929100852.GD3245006@noisy.programming.kicks-ass.net> <20250929110400.GL3419281@noisy.programming.kicks-ass.net> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 29 Sep 2025 08:53:37 -0700 Linus Torvalds wrote: > On Mon, 29 Sept 2025 at 04:10, Geert Uytterhoeven wrote: > > > > > > > > Ah, d'0h indeed. > > > > > > void b(void **);void* c();int f(void){{asm goto(""::::l0);return 0;l0:return 1;}void *x __attribute__((cleanup(b))) = c();{asm goto(""::::l1);return 2;l1:return 1;}} Should that be 'void *c(void);' (with an extra void) to avoid failing because of the K&R function declaration? David > > > > > > Seems to still finger the issue on x86_64. That should build on !x86 > > > too, right? > > > > Thanks, builds fine on arm32, arm64, riscv, m68k, powerpc, mips, s390. > > Ok, I just applied that fix directly. It's clearly not a fatal bug > since it just falls back on the non-optimal code, but it's one of > those "silly and subtle code generation issues" so I'd rather have it > fixed asap in the upstream kernel. > > Geert, thanks for noticing. > > Linus >