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a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1691616343; l=1671; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=1jpubBEYs5G/kONM8KXG1tjVjaf45XD96u1TgLGh88c=; b=HD13U7Lf7gLBUJgdxnwIDWUS5iUmJBBrEtQkf3kdA3nIJwjjfZ/thVFMV1IjFQZf6I2y84s5B 9rseL9CjIuVBaaF60aQ2gvWP/yFSYM2Erz2oCmo8XTvy/PYDz3u5bej X-Mailer: b4 0.12.3 Message-ID: <20230809-cbl-1903-v1-1-df9d66a3ba3e@google.com> Subject: [PATCH 1/2] i2c: i2c-bcm-iproc: fix -Wvoid-pointer-to-enum-cast warning From: Justin Stitt To: Andi Shyti , Ray Jui , Scott Branden , Broadcom internal kernel review list Cc: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor , Justin Stitt X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773791834941010545 X-GMAIL-MSGID: 1773791834941010545 When building with W=1 we see the following warning: | drivers/i2c/busses/i2c-bcm-iproc.c:1039:3: error: cast to smaller \ | integer type 'enum bcm_iproc_i2c_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] | 1039 | (enum bcm_iproc_i2c_type)of_device_get_match_data(&pdev->dev); | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This is due to the fact that the `bcm_iproc_i2c_type` enum members are int-width and a cast from pointer-width down to int will cause truncation and possible data loss. Although in this case `bcm_iproc_i2c_type` has only a few enumerated fields and thus there is likely no data loss occurring. Nonetheless, this patch is necessary to the goal of promoting this warning out of W=1. Link: https://github.com/ClangBuiltLinux/linux/issues/1903 Signed-off-by: Justin Stitt --- drivers/i2c/busses/i2c-bcm-iproc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c index 2d8342fdc25d..3464f3a376a5 100644 --- a/drivers/i2c/busses/i2c-bcm-iproc.c +++ b/drivers/i2c/busses/i2c-bcm-iproc.c @@ -1036,7 +1036,7 @@ static int bcm_iproc_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, iproc_i2c); iproc_i2c->device = &pdev->dev; iproc_i2c->type = - (enum bcm_iproc_i2c_type)of_device_get_match_data(&pdev->dev); + (unsigned long) of_device_get_match_data(&pdev->dev); init_completion(&iproc_i2c->done); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); From patchwork Wed Aug 9 21:25:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Stitt X-Patchwork-Id: 133610 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b824:0:b0:3f2:4152:657d with SMTP id z4csp60090vqi; Wed, 9 Aug 2023 16:04:59 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH83ks0jdshK4Q0/vhnzZ3dWLiP9kBhRA/yeGThlAk9OugB2JCpzjZjwu7sU7xL9EV4+6SH X-Received: by 2002:a17:907:2bc5:b0:992:b3a3:81f4 with SMTP id gv5-20020a1709072bc500b00992b3a381f4mr395450ejc.50.1691622299067; Wed, 09 Aug 2023 16:04:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1691622299; cv=none; d=google.com; s=arc-20160816; b=Pn2RdNmjLlFp8U8VozKpNo5plWqTeEmXaz0LIdnL+5DvXTaCeDtqCS1IpzKmAvL6D1 ibqluckSW0LtMHZoI0nwx2WLSZGHHdGcIjdnQduuSVbntSzi5liO/oMa8G9Bzzww5Zka c/isuTiEHC1Oz+AR7wnpz9lIAuxQCzh0Q7cEjdMLM/ocXBU8t5+HR2lIsiujRSHVMg5k SIovEtR7CKsUabqkZSd8jwgGBtquagVFII4u6robCXFsgCCUJEl6DLVdJ5XkRyQIXvjr Zil8KMgDPg9MdLtG2FbFHk1yk9PgQ8iyKpEjj8TN8Sftb1aq7/7BEg3ktdS4dkaTPd09 fQ4w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:dkim-signature; bh=TeHUuHfRgnWDPuFH4hkEU5fzn9hCBRBVrCadOWnm/dY=; fh=RJ1oGEP+ZGF11M//lho86SN4YwQjxHoIeZltZx6K1F4=; b=06TLp7fLmmdFg7zBcXoNlpJVjEL5izShWWcgirPHHL+Bj5AjDIHsHmTqnEi1iO/4Be KUUFxyAVVrqUhoZie9e6TQ/t2BVNEl0poAYmQVpKPsi6AyGFPESBceRzmIrwYYhBNfcF 4+mgwkIwUaOHvUFb2q4thEsx5yHfOJeIOEgx4OX1E0EW/mEMUEh0T4q+hDtfkeZd+rLE G4H27TrRj7N4Htbiw0YKYBgrgNTcbqD+w8RQcND1ZWadqRK3YfKbDzXhVqUnRm3jP4ml rcSlHk2t1JEKKMuZZVpSa0+kxZSJAR67vKE2SJK2ZjijoHQZ4pMLkqcHxENaCe5DL1bl 9N/Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20221208 header.b="m3F8/0ul"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: from out1.vger.email (out1.vger.email. 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a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1691616343; l=1145; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=8JnGtAd2EouEzprwFG0EpWdSWssM4tBnJ8iYInUW3tw=; b=y/bJoUJDpUrl23oM/z5FEe37aFVYK4HTaD9RQ9C+npAsantOFJJouIu1r+p30Gfq3nlCbIx8G DhPci9Ygy+cDBvibVqeQG0Mi40YPg54DPSndE/L8i0YHBy2nhk5+ZJD X-Mailer: b4 0.12.3 Message-ID: <20230809-cbl-1903-v1-2-df9d66a3ba3e@google.com> Subject: [PATCH 2/2] i2c: i2c-rcar: fix -Wvoid-pointer-to-enum-cast warning From: Justin Stitt To: Andi Shyti , Ray Jui , Scott Branden , Broadcom internal kernel review list Cc: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor , Justin Stitt X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773794543442602776 X-GMAIL-MSGID: 1773794543442602776 Fix the following warning: | drivers/i2c/busses/i2c-rcar.c:1066:18: error: cast to smaller integer type \ | 'enum rcar_i2c_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] | 1066 | priv->devtype = (enum rcar_i2c_type)of_device_get_match_data(dev); | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Link: https://github.com/ClangBuiltLinux/linux/issues/1904 Signed-off-by: Justin Stitt --- drivers/i2c/busses/i2c-rcar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 2d9c37410ebd..ae4072bc96dc 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -1063,7 +1063,7 @@ static int rcar_i2c_probe(struct platform_device *pdev) if (IS_ERR(priv->io)) return PTR_ERR(priv->io); - priv->devtype = (enum rcar_i2c_type)of_device_get_match_data(dev); + priv->devtype = (unsigned long) of_device_get_match_data(dev); init_waitqueue_head(&priv->wait); adap = &priv->adap;