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Thu, 13 Mar 2025 12:25:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741868713; bh=VMUOnEKoimQN6pwJj0HJ250fPvnAR+FrAocdRJsHq8I=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=HDz7LQrxn+5uMzYuKmUsr/MzQI/7LjUYAH6U0Rv69RHDL6kJTg7T/TlyBDu9nRw3f +yscSRgZu10unC9voBYFntcNfukiIMd+J2bcz0am9R1N+EDQUjRDdCzHDa7E6jAT9G elRWWLQjvLtJ+557HYrrxSzTWHiUmMyB6V6XwrGmcTe4DZAObyymSQ9P/m4v3yKCOP xCAlBAwGAQVNMI3WMjv8hvbMIBFI0Nh29MW5H2CicZPp09a6Qz/dohbQ8rK8OUI9pq 70yUl1cBUcyKqDoTT3szQWbiaOW9pyrWRuXo8DTYexs+TSxJGXCTYPsEmUMP7nS12s c+V7rKX2dyaMg== Date: Thu, 13 Mar 2025 12:25:04 +0000 From: Will Deacon To: Alessandro Carminati Cc: linux-kselftest@vger.kernel.org, David Airlie , Arnd Bergmann , =?iso-8859-1?Q?Ma=EDra?= Canal , Dan Carpenter , Kees Cook , Daniel Diaz , David Gow , Arthur Grillo , Brendan Higgins , Naresh Kamboju , Maarten Lankhorst , Andrew Morton , Maxime Ripard , Ville =?iso-8859-1?Q?Syrj=E4l=E4?= , Daniel Vetter , Thomas Zimmermann , Guenter Roeck , Alessandro Carminati , Jani Nikula , dri-devel@lists.freedesktop.org, kunit-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, loongarch@lists.linux.dev, x86@kernel.org, Linux Kernel Functional Testing , Catalin Marinas Subject: Re: [PATCH v4 07/14] arm64: Add support for suppressing warning backtraces Message-ID: <20250313122503.GA7438@willie-the-truck> References: <20250313114329.284104-1-acarmina@redhat.com> <20250313114329.284104-8-acarmina@redhat.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250313114329.284104-8-acarmina@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) On Thu, Mar 13, 2025 at 11:43:22AM +0000, Alessandro Carminati wrote: > diff --git a/arch/arm64/include/asm/bug.h b/arch/arm64/include/asm/bug.h > index 28be048db3f6..044c5e24a17d 100644 > --- a/arch/arm64/include/asm/bug.h > +++ b/arch/arm64/include/asm/bug.h > @@ -11,8 +11,14 @@ > > #include > > +#ifdef HAVE_BUG_FUNCTION > +# define __BUG_FUNC __func__ > +#else > +# define __BUG_FUNC NULL > +#endif > + > #define __BUG_FLAGS(flags) \ > - asm volatile (__stringify(ASM_BUG_FLAGS(flags))); > + asm volatile (__stringify(ASM_BUG_FLAGS(flags, %c0)) : : "i" (__BUG_FUNC)); Why is 'i' the right asm constraint to use here? It seems a bit odd to use that for a pointer. Will