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[91.180.125.239]) by smtp.gmail.com with ESMTPSA id jo14-20020a170906f6ce00b006feb5cae5f0sm2338997ejb.132.2022.05.22.04.57.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 May 2022 04:57:01 -0700 (PDT) Date: Sun, 22 May 2022 13:57:00 +0200 From: Luc Van Oostenryck To: Geert Uytterhoeven Cc: Guenter Roeck , kernel test robot , Andrew Morton , linux-staging@lists.linux.dev, "open list:TI ETHERNET SWITCH DRIVER (CPSW)" , linux-nvme@lists.infradead.org, linux-hwmon@vger.kernel.org, Linux Fbdev development list , KVM list , DRI Development , amd-gfx list , Linux Memory Management List , linux-sparse@vger.kernel.org, linux-m68k Subject: Re: [linux-next:master] BUILD REGRESSION 736ee37e2e8eed7fe48d0a37ee5a709514d478b3 Message-ID: <20220522115700.vg4hsytav74sy3x6@mail> References: <6285958d.+Z2aDZ4O1Y9eiazd%lkp@intel.com> <0530d502-1291-23f3-64ac-97bd38a26bd4@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 75C98C00C1 X-Stat-Signature: g756ewn7gtnqnij5qk43ij77h6hxmofi Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=qG3Kocds; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf28.hostedemail.com: domain of luc.vanoostenryck@gmail.com designates 209.85.218.50 as permitted sender) smtp.mailfrom=luc.vanoostenryck@gmail.com X-Rspam-User: X-HE-Tag: 1653220597-584451 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, May 20, 2022 at 02:46:20PM +0200, Geert Uytterhoeven wrote: > > The "(void)" makes sure there is no return value. > > Which matters if the result of a function returning void is propagated > > to another function returning void. > > Which, FTR, sparse also doesn't like: > > error: return expression in void function You should get this message only if the expression is itself not void. For example: $ cat test.c extern void fun(void); static void ko(int *ptr) { return *ptr; } static void ok1(int *ptr) { return (void) *ptr; } static void ok2(int *ptr) { return fun(); } $ sparse test.c test.c:5:16: error: return expression in void function IOW, sparse warn only for the ko() but not for ok1() or ok2(). If you have a case whee it s not the case, please send me the pre-processed file and I'll be glad to investigate. Best regards, -- Luc