linux-kernel - [PATCH] drm/msm: Use div64_ul instead of do

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Date:   Tue, 26 Apr 2022 21:21:26 +0800
From:   Wan Jiabing <wanjiabing@...o.com>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     Wan Jiabing <wanjiabing@...o.com>
Subject: [PATCH] drm/msm: Use div64_ul instead of do_div

Fix following coccicheck warning:
drivers/gpu/drm/msm/msm_gpu_devfreq.c:72:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_ul instead.

Use div64_ul instead of do_div to avoid a possible truncation.

Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
---
 drivers/gpu/drm/msm/msm_gpu_devfreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index d2539ca78c29..c2ea978c8921 100644
--- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
+++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
@@ -69,7 +69,7 @@ static void get_raw_dev_status(struct msm_gpu *gpu,
 	df->time = time;
 
 	busy_time *= USEC_PER_SEC;
-	do_div(busy_time, sample_rate);
+	busy_time = div64_ul(busy_time, sample_rate);
 	if (WARN_ON(busy_time > ~0LU))
 		busy_time = ~0LU;
 
-- 
2.35.3