From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 78D8E29AB1A; Mon, 7 Sep 2026 05:45:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788759924; cv=none; b=Qp9db2cL3IStbrOxeOHcqzfbiGThlr54f1I9F5nu4K8J+P8UBi/wt4sX3tWm2bbzccmHElvxMsmDowm8av+oHVjmVulm1NoTIiSl9/uyVjwZgRYPCb7hfyXUqKx9dIUg4K+Hr+2qEeOsds4mOsIsODnAaxcPg49JqK1H0O8/m9M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788759924; c=relaxed/simple; bh=jHaxIQ3pA1eeWIle1Pk9J90EZmpff5RsKw2PfaVnl9A=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=lHhrWcCa46UZ1PRPiAjE3ZcyZVj7qT9ZMAI/bXw+Z7W81T/tNlW7uV083c0d6i3Ug9bly+4f0j3tytEEv6P0sRAc5cymnyzeAIVa8bsSLA3LQJnrgZ9HOXYwO0vESqIBqVh+pCZQt3+TIyaTrtK8xXLh0mJYqcIpR9ztHMveSgw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=SfWSK/ah; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="SfWSK/ah" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1788759912; bh=jHaxIQ3pA1eeWIle1Pk9J90EZmpff5RsKw2PfaVnl9A=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=SfWSK/ahn06kZntBnbhT0gYtxboxUyXFW9sznUoNgaeOlkScL/EVWj5kKaLRsnxwj qMTCIvjn1ZFkBsUI621/mshp8jAEz3LFaTdQTx92ltJp+/r/7ijQnRwI9imYQl/R3l jWF+lfEnUxnVx74sACHqIQFXMyfW7+dmRlk0kr4s= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Mon, 07 Sep 2026 07:45:03 +0200 Subject: [PATCH v2 3/3] driver core: Constify the signature of device_show/store_*() Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260907-sysfs-const-attr-dev_ext_attr-v2-3-bf53afe57071@weissschuh.net> References: <20260907-sysfs-const-attr-dev_ext_attr-v2-0-bf53afe57071@weissschuh.net> In-Reply-To: <20260907-sysfs-const-attr-dev_ext_attr-v2-0-bf53afe57071@weissschuh.net> To: Tony Luck , Borislav Petkov , Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Will Deacon , Mark Rutland , Jonathan Cameron , Yushan Wang , Jijie Shao , Khuong Dinh , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich Cc: linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-cxl@vger.kernel.org, linux-arm-msm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, driver-core@lists.linux.dev, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1788759912; l=5954; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=jHaxIQ3pA1eeWIle1Pk9J90EZmpff5RsKw2PfaVnl9A=; b=HSiLRH38g3xSkpGb5oIKBJaK+SOmvIEuNwqO/eqdT7KHt7JaySzEjU5t5xVPUxSbcL/2oSJ8q Vg+/kfFlctnBza+sS9aoCZ//ve+6Dyrc1y3gZ5QVZWXlD8L1tbcV9W2 X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= Prepare for the constification of 'struct dev_ext_attribute' by changing the signature of the standard callback functions. Migrate the hv-24x7 driver in the same commit. It is the only user to manually assign one of the standard callbacks. Signed-off-by: Thomas Weißschuh --- arch/powerpc/perf/hv-24x7.c | 2 +- drivers/base/core.c | 30 +++++++++++++++--------------- include/linux/device.h | 14 +++++++------- 3 files changed, 23 insertions(+), 23 deletions(-) diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c index b0eedf185960..3e094dc7d76b 100644 --- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -462,7 +462,7 @@ static struct attribute *device_str_attr_create_(char *name, char *str) attr->var = str; attr->attr.attr.name = name; attr->attr.attr.mode = 0444; - attr->attr.show = device_show_string; + attr->attr.show_const = device_show_string; return &attr->attr.attr; } diff --git a/drivers/base/core.c b/drivers/base/core.c index 4c0c373998a1..5daa88fa724a 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -2517,13 +2517,13 @@ static const struct sysfs_ops dev_sysfs_ops = { .store = dev_attr_store, }; -#define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) +#define to_ext_attr(x) container_of_const(x, struct dev_ext_attribute, attr) ssize_t device_store_ulong(struct device *dev, - struct device_attribute *attr, + const struct device_attribute *attr, const char *buf, size_t size) { - struct dev_ext_attribute *ea = to_ext_attr(attr); + const struct dev_ext_attribute *ea = to_ext_attr(attr); int ret; unsigned long new; @@ -2537,19 +2537,19 @@ ssize_t device_store_ulong(struct device *dev, EXPORT_SYMBOL_GPL(device_store_ulong); ssize_t device_show_ulong(struct device *dev, - struct device_attribute *attr, + const struct device_attribute *attr, char *buf) { - struct dev_ext_attribute *ea = to_ext_attr(attr); + const struct dev_ext_attribute *ea = to_ext_attr(attr); return sysfs_emit(buf, "%lx\n", *(unsigned long *)(ea->var)); } EXPORT_SYMBOL_GPL(device_show_ulong); ssize_t device_store_int(struct device *dev, - struct device_attribute *attr, + const struct device_attribute *attr, const char *buf, size_t size) { - struct dev_ext_attribute *ea = to_ext_attr(attr); + const struct dev_ext_attribute *ea = to_ext_attr(attr); int ret; long new; @@ -2566,19 +2566,19 @@ ssize_t device_store_int(struct device *dev, EXPORT_SYMBOL_GPL(device_store_int); ssize_t device_show_int(struct device *dev, - struct device_attribute *attr, + const struct device_attribute *attr, char *buf) { - struct dev_ext_attribute *ea = to_ext_attr(attr); + const struct dev_ext_attribute *ea = to_ext_attr(attr); return sysfs_emit(buf, "%d\n", *(int *)(ea->var)); } EXPORT_SYMBOL_GPL(device_show_int); -ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, +ssize_t device_store_bool(struct device *dev, const struct device_attribute *attr, const char *buf, size_t size) { - struct dev_ext_attribute *ea = to_ext_attr(attr); + const struct dev_ext_attribute *ea = to_ext_attr(attr); if (kstrtobool(buf, ea->var) < 0) return -EINVAL; @@ -2587,19 +2587,19 @@ ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, } EXPORT_SYMBOL_GPL(device_store_bool); -ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, +ssize_t device_show_bool(struct device *dev, const struct device_attribute *attr, char *buf) { - struct dev_ext_attribute *ea = to_ext_attr(attr); + const struct dev_ext_attribute *ea = to_ext_attr(attr); return sysfs_emit(buf, "%d\n", *(bool *)(ea->var)); } EXPORT_SYMBOL_GPL(device_show_bool); ssize_t device_show_string(struct device *dev, - struct device_attribute *attr, char *buf) + const struct device_attribute *attr, char *buf) { - struct dev_ext_attribute *ea = to_ext_attr(attr); + const struct dev_ext_attribute *ea = to_ext_attr(attr); return sysfs_emit(buf, "%s\n", (char *)ea->var); } diff --git a/include/linux/device.h b/include/linux/device.h index aee79fd6b32b..90cdd77458bb 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -129,19 +129,19 @@ struct dev_ext_attribute { void *var; }; -ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr, +ssize_t device_show_ulong(struct device *dev, const struct device_attribute *attr, char *buf); -ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr, +ssize_t device_store_ulong(struct device *dev, const struct device_attribute *attr, const char *buf, size_t count); -ssize_t device_show_int(struct device *dev, struct device_attribute *attr, +ssize_t device_show_int(struct device *dev, const struct device_attribute *attr, char *buf); -ssize_t device_store_int(struct device *dev, struct device_attribute *attr, +ssize_t device_store_int(struct device *dev, const struct device_attribute *attr, const char *buf, size_t count); -ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, +ssize_t device_show_bool(struct device *dev, const struct device_attribute *attr, char *buf); -ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, +ssize_t device_store_bool(struct device *dev, const struct device_attribute *attr, const char *buf, size_t count); -ssize_t device_show_string(struct device *dev, struct device_attribute *attr, +ssize_t device_show_string(struct device *dev, const struct device_attribute *attr, char *buf); typedef ssize_t __device_show_handler_const(struct device *dev, const struct device_attribute *attr, -- 2.55.0