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Wed, 9 Feb 2022 08:37:25 +0000 From: Qing Wang To: Rob Clark , Sean Paul , David Airlie , Daniel Vetter , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Wang Qing Subject: [PATCH] gpu: drm: msm: use div64_u64() instead of do_div() Date: Wed, 9 Feb 2022 00:37:17 -0800 Message-Id: <1644395837-3845-1-git-send-email-wangqing@vivo.com> X-Mailer: git-send-email 2.7.4 X-ClientProxiedBy: SGAP274CA0006.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b6::18) To SL2PR06MB3082.apcprd06.prod.outlook.com (2603:1096:100:37::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 27d35d51-edd8-41be-a475-08d9eba765ea X-MS-TrafficTypeDiagnostic: PS2PR06MB3559:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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When the divisor is u64, do_div() truncates it to 32 bits, this means it can test non-zero and be truncated to zero for division. fix do_div.cocci warning: do_div() does a 64-by-32 division, please consider using div64_u64 instead. Signed-off-by: Wang Qing --- drivers/gpu/drm/msm/msm_gpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c index 2c1049c..aa4617b --- a/drivers/gpu/drm/msm/msm_gpu.c +++ b/drivers/gpu/drm/msm/msm_gpu.c @@ -648,7 +648,7 @@ static void retire_submit(struct msm_gpu *gpu, struct msm_ringbuffer *ring, /* Calculate the clock frequency from the number of CP cycles */ if (elapsed) { clock = (stats->cpcycles_end - stats->cpcycles_start) * 1000; - do_div(clock, elapsed); + div64_u64(clock, elapsed); } trace_msm_gpu_submit_retired(submit, elapsed, clock,