From nobody Wed Sep 17 21:00:01 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19B6DC4332F for ; Thu, 15 Dec 2022 16:37:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230136AbiLOQhC (ORCPT ); Thu, 15 Dec 2022 11:37:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230167AbiLOQhA (ORCPT ); Thu, 15 Dec 2022 11:37:00 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C4091EAFF for ; Thu, 15 Dec 2022 08:36:59 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id EAD3DB81C03 for ; Thu, 15 Dec 2022 16:36:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07826C433EF; Thu, 15 Dec 2022 16:36:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1671122216; bh=ZJ+UjuFlAHEeqnv1r+X8Y1fN3lyrw6ECR6xLRaAEqRs=; h=From:To:Cc:Subject:Date:From; b=s/ZJp7C9+lCHF8eafSYx+Wl0LjwFFtKVRaeM6VE62PEFslr7gD0rOlWNHK8Q9aO/u IJOYYYtArmR9K6dhMjAmuTjXMsFNnBg6W3wep8Co6lTtLQsYIKH3u2M6AbVbY7jja2 ZVQ9NHhLpZr+PjJGuKeDYs1dCR8BIWWjsHfX83awoSjiyEEmswpWr0EnvUAcS+omvL Nb3YMtjm36x6088xcboN9A1ic9ArjNsJMSPpirfuQlZeJ/gwe5CfmJl9tS1pu5EmB/ B7u2G1o0fLIXH1ssDwvxusBqB/+lI+ZZD4jDgJZVsnS2bfDHZW/5RkG/5AOPrG0eLM PNwp9/RZx9cTw== From: Arnd Bergmann To: Evan Quan , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , "Pan, Xinhui" Cc: Arnd Bergmann , David Airlie , Daniel Vetter , Nathan Chancellor , Nick Desaulniers , Tom Rix , Kenneth Feng , Hawking Zhang , Yang Wang , Chengming Gui , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] drm/amd/pm: avoid large variable on kernel stack Date: Thu, 15 Dec 2022 17:36:31 +0100 Message-Id: <20221215163649.386750-1-arnd@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Arnd Bergmann The activity_monitor_external[] array is too big to fit on the kernel stack, resulting in this warning with clang: drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_7_ppt.c:1438:12: err= or: stack frame size (1040) exceeds limit (1024) in 'smu_v13_0_7_get_power_= profile_mode' [-Werror,-Wframe-larger-than] Use dynamic allocation instead. It should also be possible to have single element here instead of the array, but this seems easier. Fixes: 334682ae8151 ("drm/amd/pm: enable workload type change on smu_v13_0_= 7") Signed-off-by: Arnd Bergmann --- .../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 21 ++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c b/drivers= /gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c index c270f94a1b86..7eba854e09ec 100644 --- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c +++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c @@ -1439,7 +1439,7 @@ static int smu_v13_0_7_get_power_limit(struct smu_con= text *smu, =20 static int smu_v13_0_7_get_power_profile_mode(struct smu_context *smu, cha= r *buf) { - DpmActivityMonitorCoeffIntExternal_t activity_monitor_external[PP_SMC_POW= ER_PROFILE_COUNT]; + DpmActivityMonitorCoeffIntExternal_t *activity_monitor_external; uint32_t i, j, size =3D 0; int16_t workload_type =3D 0; int result =3D 0; @@ -1447,6 +1447,12 @@ static int smu_v13_0_7_get_power_profile_mode(struct= smu_context *smu, char *buf if (!buf) return -EINVAL; =20 + activity_monitor_external =3D kcalloc(sizeof(activity_monitor_external), + PP_SMC_POWER_PROFILE_COUNT, + GFP_KERNEL); + if (!activity_monitor_external) + return -ENOMEM; + size +=3D sysfs_emit_at(buf, size, " "); for (i =3D 0; i <=3D PP_SMC_POWER_PROFILE_WINDOW3D; i++) size +=3D sysfs_emit_at(buf, size, "%-14s%s", amdgpu_pp_profile_name[i], @@ -1459,15 +1465,17 @@ static int smu_v13_0_7_get_power_profile_mode(struc= t smu_context *smu, char *buf workload_type =3D smu_cmn_to_asic_specific_index(smu, CMN2ASIC_MAPPING_WORKLOAD, i); - if (workload_type < 0) - return -EINVAL; + if (workload_type < 0) { + result =3D -EINVAL; + goto out; + } =20 result =3D smu_cmn_update_table(smu, SMU_TABLE_ACTIVITY_MONITOR_COEFF, workload_type, (void *)(&activity_monitor_external[i]), false); if (result) { dev_err(smu->adev->dev, "[%s] Failed to get activity monitor!", __func_= _); - return result; + goto out; } } =20 @@ -1495,7 +1503,10 @@ do { \ PRINT_DPM_MONITOR(Fclk_BoosterFreq); #undef PRINT_DPM_MONITOR =20 - return size; + result =3D size; +out: + kfree(activity_monitor_external); + return result; } =20 static int smu_v13_0_7_set_power_profile_mode(struct smu_context *smu, lon= g *input, uint32_t size) --=20 2.35.1