From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C24731C32FF for ; Mon, 14 Oct 2024 11:01:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728903664; cv=none; b=MNi8YBDL795gg840lkT8srHnC65jTV2w2juSNcqIZkVDGkNrsS4ysGVLTDDQGNmd66Jn9qzyAG4O1M7J18EqZSFsmMB2yfjFK9vMi04jKQaThF2tW15s8tiPpK62GyFgrhhHZlJS9OYsYLdkQBOXcCUWCJa4uOLzyW5ftPKRptg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728903664; c=relaxed/simple; bh=S3goNA8RPfHYwLHqtnd5h1RE7o8K/K9TDeZQJY3JteE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FLHIrqDoL+HWPl/YkbdAHXcSaFUxkyZMF5+tGaNj47Y6/jivvjZXZ1AWisHDiDCoGZo6tlA8b86MkGbGPKQCGI8HVPdyysQDe/pxdaUJ+v2t//kW1mFDlxG2AZ+StMjbbW5qf+L5BXUEEl8OXgcH1mr1lvUblv4siAPHMyh02QY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1454116F3; Mon, 14 Oct 2024 04:01:32 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EAD463F51B; Mon, 14 Oct 2024 04:00:59 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , David Hildenbrand , Greg Marsden , Ivan Ivanov , Kalesh Singh , Marc Zyngier , Mark Rutland , Matthias Brugger , Miroslav Benes , Will Deacon , Yury Norov Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1 30/57] drivers/base: Remove PAGE_SIZE compile-time constant assumption Date: Mon, 14 Oct 2024 11:58:37 +0100 Message-ID: <20241014105912.3207374-30-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241014105912.3207374-1-ryan.roberts@arm.com> References: <20241014105514.3206191-1-ryan.roberts@arm.com> <20241014105912.3207374-1-ryan.roberts@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To prepare for supporting boot-time page size selection, refactor code to remove assumptions about PAGE_SIZE being compile-time constant. Code intended to be equivalent when compile-time page size is active. Update BUILD_BUG_ON() to test against page size limits. CPUMAP_FILE_MAX_BYTES and CPULIST_FILE_MAX_BYTES are both defined relative to PAGE_SIZE, so when these values are assigned to global variables via BIN_ATTR_RO(), let's wrap them with DEFINE_GLOBAL_PAGE_SIZE_VAR() so that their assignment can be deferred until boot-time. Signed-off-by: Ryan Roberts --- ***NOTE*** Any confused maintainers may want to read the cover note here for context: https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/ drivers/base/node.c | 6 +++--- drivers/base/topology.c | 32 ++++++++++++++++---------------- include/linux/cpumask.h | 5 +++++ 3 files changed, 24 insertions(+), 19 deletions(-) diff --git a/drivers/base/node.c b/drivers/base/node.c index eb72580288e62..30e6549e4c438 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -45,7 +45,7 @@ static inline ssize_t cpumap_read(struct file *file, struct kobject *kobj, return n; } -static BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES); static inline ssize_t cpulist_read(struct file *file, struct kobject *kobj, struct bin_attribute *attr, char *buf, @@ -66,7 +66,7 @@ static inline ssize_t cpulist_read(struct file *file, struct kobject *kobj, return n; } -static BIN_ATTR_RO(cpulist, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(cpulist, CPULIST_FILE_MAX_BYTES); /** * struct node_access_nodes - Access class device to hold user visible @@ -558,7 +558,7 @@ static ssize_t node_read_distance(struct device *dev, * buf is currently PAGE_SIZE in length and each node needs 4 chars * at the most (distance + space or newline). */ - BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); + BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE_MIN); for_each_online_node(i) { len += sysfs_emit_at(buf, len, "%s%d", diff --git a/drivers/base/topology.c b/drivers/base/topology.c index 89f98be5c5b99..bdbdbefd95b15 100644 --- a/drivers/base/topology.c +++ b/drivers/base/topology.c @@ -62,47 +62,47 @@ define_id_show_func(ppin, "0x%llx"); static DEVICE_ATTR_ADMIN_RO(ppin); define_siblings_read_func(thread_siblings, sibling_cpumask); -static BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES); define_siblings_read_func(core_cpus, sibling_cpumask); -static BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES); define_siblings_read_func(core_siblings, core_cpumask); -static BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES); #ifdef TOPOLOGY_CLUSTER_SYSFS define_siblings_read_func(cluster_cpus, cluster_cpumask); -static BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES); #endif #ifdef TOPOLOGY_DIE_SYSFS define_siblings_read_func(die_cpus, die_cpumask); -static BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES); #endif define_siblings_read_func(package_cpus, core_cpumask); -static BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES); #ifdef TOPOLOGY_BOOK_SYSFS define_id_show_func(book_id, "%d"); static DEVICE_ATTR_RO(book_id); define_siblings_read_func(book_siblings, book_cpumask); -static BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES); #endif #ifdef TOPOLOGY_DRAWER_SYSFS define_id_show_func(drawer_id, "%d"); static DEVICE_ATTR_RO(drawer_id); define_siblings_read_func(drawer_siblings, drawer_cpumask); -static BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES); -static BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES); +static CPU_FILE_BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES); #endif static struct bin_attribute *bin_attrs[] = { diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 53158de44b837..f654b4198abc2 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -1292,4 +1292,9 @@ cpumap_print_list_to_buf(char *buf, const struct cpumask *mask, ? (NR_CPUS * 9)/32 - 1 : PAGE_SIZE) #define CPULIST_FILE_MAX_BYTES (((NR_CPUS * 7)/2 > PAGE_SIZE) ? (NR_CPUS * 7)/2 : PAGE_SIZE) +#define CPU_FILE_BIN_ATTR_RO(_name, _size) \ + DEFINE_GLOBAL_PAGE_SIZE_VAR(struct bin_attribute, \ + bin_attr_##_name, \ + __BIN_ATTR_RO(_name, _size)) + #endif /* __LINUX_CPUMASK_H */ -- 2.43.0