From:   Arnd Bergmann <arnd@kernel.org>
To:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Sebastian Reichel <sre@kernel.org>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH] power: supply: qcom_battmgr: remove bogus do_div()
Date:   Tue, 14 Feb 2023 14:20:42 +0100
Message-Id: <20230214132052.1556699-1-arnd@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Arnd Bergmann <arnd@arndb.de>

The argument to do_div() is a 32-bit integer, and it was read from a
32-bit register so there is no point in doing a 64-bit division on it.

On 32-bit arm, do_div() causes a compile-time warning here:

include/asm-generic/div64.h:238:22: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Werror=incompatible-pointer-types]
  238 |   __rem = __div64_32(&(n), __base); \
      |                      ^~~~
      |                      |
      |                      unsigned int *
drivers/power/supply/qcom_battmgr.c:1130:4: note: in expansion of macro 'do_div'
 1130 |    do_div(battmgr->status.percent, 100);

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/power/supply/qcom_battmgr.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
index ec31f887184f..de77df97b3a4 100644
--- a/drivers/power/supply/qcom_battmgr.c
+++ b/drivers/power/supply/qcom_battmgr.c
@@ -1126,8 +1126,7 @@ static void qcom_battmgr_sm8350_callback(struct qcom_battmgr *battmgr,
 			battmgr->info.charge_type = le32_to_cpu(resp->intval.value);
 			break;
 		case BATT_CAPACITY:
-			battmgr->status.percent = le32_to_cpu(resp->intval.value);
-			do_div(battmgr->status.percent, 100);
+			battmgr->status.percent = le32_to_cpu(resp->intval.value) / 100;
 			break;
 		case BATT_VOLT_OCV:
 			battmgr->status.voltage_ocv = le32_to_cpu(resp->intval.value);
-- 
2.39.1