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Tue, 21 Apr 2026 15:30:53 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AzKWF4Bi_gH- Date: Tue, 21 Apr 2026 21:30:17 +0200 From: "Arnd Bergmann" To: "Marco Elver" , "Miguel Ojeda" Cc: kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, "Miguel Ojeda" , "Dmitry Vyukov" , "Nathan Chancellor" , llvm@lists.linux.dev Message-Id: <63e461c3-2d8e-47c0-9901-34b53e53f22b@app.fastmail.com> In-Reply-To: References: <20260421190351.1976329-1-elver@google.com> Subject: Re: [PATCH 1/2] Compiler Attributes: Add __access macro Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Tue, Apr 21, 2026, at 21:20, Marco Elver wrote: > On Tue, 21 Apr 2026 at 21:15, Miguel Ojeda > wrote: >> >> On Tue, Apr 21, 2026 at 9:04=E2=80=AFPM Marco Elver wrote: >> > >> > Add support for the `__access__` attribute, which is supported sinc= e gcc >> > >=3D 11 but not currently supported by clang. >> >> > + * Optional: only supported since gcc >=3D 11 >> >> From a quick try in Compiler Explorer, it seems GCC recognizes it >> starting with GCC 10 rather than 11. It also seems to be in the docs. >> Is there a reason for the 11? > > Oh, will fix. In the original report by Arnd we somehow concluded it > was 11, but I guess I should double check such things. :-) gcc-10 knows the 'access' attribute, but not the 'none' variant: echo 'int f(void *p) __attribute__((access(none, 1)));' | /home/arnd/cro= ss/arm64/gcc-10.5.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc -xc - -o= /dev/null -c :1:1: error: attribute 'access' invalid mode 'none'; expected one= of 'read_only', 'read_write', or 'write_only' Arnd