linux-kernel - [PATCH RFC 06/10] sysfs: treewide: constify attribute callback of bin

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Message-Id: <20241031-sysfs-const-bin_attr-v1-6-2281afa7f055@weissschuh.net>
Date: Thu, 31 Oct 2024 02:43:55 +0000
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Dan Williams <dan.j.williams@...el.com>, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH RFC 06/10] sysfs: treewide: constify attribute callback of
 bin_attribute::mmap()

The mmap() callbacks should not modify the struct
bin_attribute passed as argument.
Enforce this by marking the argument as const.

As there are not many callback implementers perform this change
throughout the tree at once.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/misc/ocxl/sysfs.c              | 2 +-
 drivers/pci/p2pdma.c                   | 2 +-
 drivers/pci/pci-sysfs.c                | 6 +++---
 drivers/platform/x86/intel/pmt/class.c | 2 +-
 drivers/uio/uio_hv_generic.c           | 2 +-
 include/linux/sysfs.h                  | 2 +-
 6 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/misc/ocxl/sysfs.c b/drivers/misc/ocxl/sysfs.c
index 405180d47d9bff0aaa7a736bb3fecfbe318db961..07520d6e6dc55702696b8656440914c379e6e27a 100644
--- a/drivers/misc/ocxl/sysfs.c
+++ b/drivers/misc/ocxl/sysfs.c
@@ -125,7 +125,7 @@ static const struct vm_operations_struct global_mmio_vmops = {
 };
 
 static int global_mmio_mmap(struct file *filp, struct kobject *kobj,
-			struct bin_attribute *bin_attr,
+			const struct bin_attribute *bin_attr,
 			struct vm_area_struct *vma)
 {
 	struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj));
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 4f47a13cb500ff5339cde426b6ccb020fcd74ae7..7abd4f546d3c071f31e622d881f5c5ac3e4de55e 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -90,7 +90,7 @@ static ssize_t published_show(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR_RO(published);
 
 static int p2pmem_alloc_mmap(struct file *filp, struct kobject *kobj,
-		struct bin_attribute *attr, struct vm_area_struct *vma)
+		const struct bin_attribute *attr, struct vm_area_struct *vma)
 {
 	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
 	size_t len = vma->vm_end - vma->vm_start;
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 13912940ed2bb66c0086e5bea9a3cb6417ac14dd..36017fd1d4235d0a42fa91b47a3c6de82d9af978 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1034,7 +1034,7 @@ void pci_remove_legacy_files(struct pci_bus *b)
  *
  * Use the regular PCI mapping routines to map a PCI resource into userspace.
  */
-static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
+static int pci_mmap_resource(struct kobject *kobj, const struct bin_attribute *attr,
 			     struct vm_area_struct *vma, int write_combine)
 {
 	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
@@ -1059,14 +1059,14 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 }
 
 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
-				struct bin_attribute *attr,
+				const struct bin_attribute *attr,
 				struct vm_area_struct *vma)
 {
 	return pci_mmap_resource(kobj, attr, vma, 0);
 }
 
 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
-				struct bin_attribute *attr,
+				const struct bin_attribute *attr,
 				struct vm_area_struct *vma)
 {
 	return pci_mmap_resource(kobj, attr, vma, 1);
diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index c04bb7f97a4db13268fc5697887951cf8f0f5a25..f9afa23e754b8b68bd59b72d6a72d26503a21f31 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -103,7 +103,7 @@ intel_pmt_read(struct file *filp, struct kobject *kobj,
 
 static int
 intel_pmt_mmap(struct file *filp, struct kobject *kobj,
-		struct bin_attribute *attr, struct vm_area_struct *vma)
+		const struct bin_attribute *attr, struct vm_area_struct *vma)
 {
 	struct intel_pmt_entry *entry = container_of(attr,
 						     struct intel_pmt_entry,
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index 8704095994118c2660f345c504b5ea466d053efb..3976360d0096d6681faf88815cc6277fb76a1d9f 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -135,7 +135,7 @@ static void hv_uio_rescind(struct vmbus_channel *channel)
  * The ring buffer is allocated as contiguous memory by vmbus_open
  */
 static int hv_uio_ring_mmap(struct file *filp, struct kobject *kobj,
-			    struct bin_attribute *attr,
+			    const struct bin_attribute *attr,
 			    struct vm_area_struct *vma)
 {
 	struct vmbus_channel *channel
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index d1b22d56198b55ee39fe4c4fc994f5b753641992..9fcdc8cd3118f359742bfd8b708d5c3eff511042 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -309,7 +309,7 @@ struct bin_attribute {
 			 char *, loff_t, size_t);
 	loff_t (*llseek)(struct file *, struct kobject *, struct bin_attribute *,
 			 loff_t, int);
-	int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
+	int (*mmap)(struct file *, struct kobject *, const struct bin_attribute *attr,
 		    struct vm_area_struct *vma);
 };
 

-- 
2.47.0