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Date: Fri, 13 Oct 2023 16:23:33 +0300 Message-ID: <20231013132333.10582-1-marius.cristea@microchip.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_PASS,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Fri, 13 Oct 2023 06:24:25 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779646821768995553 X-GMAIL-MSGID: 1779646821768995553 From: Marius Cristea The patch 33ec3e5fc1ea: "iio: adc: adding support for MCP3564 ADC" leads to the following Smatch static checker warning: smatch warnings: drivers/iio/adc/mcp3564.c:1105 mcp3564_fill_scale_tbls() warn: unsigned '__x' is never less than zero. vim +/__x +1105 drivers/iio/adc/mcp3564.c 1094 1095 static void mcp3564_fill_scale_tbls(struct mcp3564_state *adc) 1096 { ..... 1103 for (i = 0; i < MCP3564_MAX_PGA; i++) { 1104 ref = adc->vref_mv; > 1105 tmp1 = shift_right((u64)ref * NANO, pow); 1106 div_u64_rem(tmp1, NANO, &tmp0); 1107 ..... 1113 } Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202309280738.NWjVfVt4-lkp@intel.com/ Fixes: 33ec3e5fc1ea (iio: adc: adding support for MCP3564 ADC) Signed-off-by: Marius Cristea --- drivers/iio/adc/mcp3564.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: 5e99f692d4e32e3250ab18d511894ca797407aec diff --git a/drivers/iio/adc/mcp3564.c b/drivers/iio/adc/mcp3564.c index 9ede1a5d5d7b..e3f1de5fcc5a 100644 --- a/drivers/iio/adc/mcp3564.c +++ b/drivers/iio/adc/mcp3564.c @@ -1102,7 +1102,7 @@ static void mcp3564_fill_scale_tbls(struct mcp3564_state *adc) for (i = 0; i < MCP3564_MAX_PGA; i++) { ref = adc->vref_mv; - tmp1 = shift_right((u64)ref * NANO, pow); + tmp1 = ((u64)ref * NANO) >> pow; div_u64_rem(tmp1, NANO, &tmp0); tmp1 = tmp1 * mcp3564_hwgain_frac[(2 * i) + 1];