From: Sameer Pujar <spujar@nvidia.com>
To: <broonie@kernel.org>, <lgirdwood@gmail.com>, <perex@perex.cz>,
<tiwai@suse.com>, <geert@linux-m68k.org>, <rdunlap@infradead.org>
Cc: <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
<alsa-devel@alsa-project.org>, <linux-tegra@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, Sameer Pujar <spujar@nvidia.com>
Subject: [PATCH] ASoC: tegra: Fix build error due to 64-by-32 division
Date: Thu, 23 Jul 2020 13:43:31 +0530 [thread overview]
Message-ID: <1595492011-2411-1-git-send-email-spujar@nvidia.com> (raw)
Build errors are seen on 32-bit platforms because of a plain 64-by-32
division. For example, following build erros were reported.
"ERROR: modpost: "__udivdi3" [sound/soc/tegra/snd-soc-tegra210-dmic.ko]
undefined!"
"ERROR: modpost: "__divdi3" [sound/soc/tegra/snd-soc-tegra210-dmic.ko]
undefined!"
This can be fixed by using div_u64() helper from 'math64.h' header.
Fixes: 8c8ff982e9e2 ("ASoC: tegra: Add Tegra210 based DMIC driver")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
---
sound/soc/tegra/tegra210_dmic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/sound/soc/tegra/tegra210_dmic.c b/sound/soc/tegra/tegra210_dmic.c
index ff6fd65..d682414 100644
--- a/sound/soc/tegra/tegra210_dmic.c
+++ b/sound/soc/tegra/tegra210_dmic.c
@@ -6,6 +6,7 @@
#include <linux/clk.h>
#include <linux/device.h>
+#include <linux/math64.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
@@ -129,7 +130,7 @@ static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
* Boost Gain Volume control has 100x factor.
*/
if (dmic->boost_gain)
- gain_q23 = (gain_q23 * dmic->boost_gain) / 100;
+ gain_q23 = div_u64(gain_q23 * dmic->boost_gain, 100);
regmap_write(dmic->regmap, TEGRA210_DMIC_LP_FILTER_GAIN,
(unsigned int)gain_q23);
--
2.7.4
next reply other threads:[~2020-07-23 8:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-23 8:13 Sameer Pujar [this message]
2020-07-23 20:20 ` [PATCH] ASoC: tegra: Fix build error due to 64-by-32 division Mark Brown
2020-07-23 20:33 ` Randy Dunlap
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