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Mon, 09 Sep 2019 20:42:51 -0700 (PDT) Date: Mon, 9 Sep 2019 20:42:49 -0700 From: Nathan Chancellor To: Arnd Bergmann Subject: Re: [PATCH] arm64: fix unreachable code issue with cmpxchg Message-ID: <20190910034249.GA1673@archlinux-threadripper> References: <20190909202153.144970-1-arnd@arndb.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190909202153.144970-1-arnd@arndb.de> User-Agent: Mutt/1.12.1 (2019-06-15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190909_204258_560153_569DE456 X-CRM114-Status: GOOD ( 13.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Catalin Marinas , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Andrew Murray , Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 09, 2019 at 10:21:35PM +0200, Arnd Bergmann wrote: > On arm64 build with clang, sometimes the __cmpxchg_mb is not inlined > when CONFIG_OPTIMIZE_INLINING is set. > Clang then fails a compile-time assertion, because it cannot tell at > compile time what the size of the argument is: > > mm/memcontrol.o: In function `__cmpxchg_mb': > memcontrol.c:(.text+0x1a4c): undefined reference to `__compiletime_assert_175' > memcontrol.c:(.text+0x1a4c): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `__compiletime_assert_175' > > Mark all of the cmpxchg() style functions as __always_inline to > ensure that the compiler can see the result. > > Signed-off-by: Arnd Bergmann Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel