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Tue, 07 Sep 2021 10:48:54 -0700 (PDT) Sender: Guenter Roeck Subject: Re: [PATCH] Enable '-Werror' by default for all kernel builds To: Linus Torvalds , Arnd Bergmann Cc: Nathan Chancellor , Linux Kernel Mailing List , llvm@lists.linux.dev, Nick Desaulniers References: <20210906142615.GA1917503@roeck-us.net> From: Guenter Roeck Message-ID: <1b7cac01-adab-e2d4-769b-b14ed8903ad9@roeck-us.net> Date: Tue, 7 Sep 2021 10:48:52 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/7/21 10:10 AM, Linus Torvalds wrote: > On Tue, Sep 7, 2021 at 2:11 AM Arnd Bergmann wrote: >> >>> x86_64-alpine.log:drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:452:13: error: stack frame size (1800) exceeds limit (1280) in function 'dcn_bw_calc_rq_dlg_ttu' [-Werror,-Wframe-larger-than] >>> x86_64-alpine.log:drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn21/display_rq_dlg_calc_21.c:1657:6: error: stack frame size (1336) exceeds limit (1280) in function 'dml21_rq_dlg_get_dlg_reg' [-Werror,-Wframe-larger-than] >>> x86_64-alpine.log:drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_rq_dlg_calc_30.c:1831:6: error: stack frame size (1352) exceeds limit (1280) in function 'dml30_rq_dlg_get_dlg_reg' [-Werror,-Wframe-larger-than] >>> x86_64-alpine.log:drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_rq_dlg_calc_31.c:1676:6: error: stack frame size (1336) exceeds limit (1280) in function 'dml31_rq_dlg_get_dlg_reg' [-Werror,-Wframe-larger-than] >>> x86_64-alpine.log:drivers/vhost/scsi.c:1831:12: error: stack frame size (1320) exceeds limit (1280) in function 'vhost_scsi_release' [-Werror,-Wframe-larger-than] >>> FWIW, the above is because of static void vhost_scsi_flush(struct vhost_scsi *vs) { struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; where VHOST_SCSI_MAX_VQ=128. Presumably some versions of clang inline this function. gcc has the same problem here - its stack frame size is also > 1024 for vhost_scsi_flush(). Guenter