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authorIvan Orlov <ivan.orlov0322@gmail.com>2023-06-20 21:33:15 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-06-24 02:59:27 +0300
commitb5665cf936bf3955fec18c09a6aa53c8a57ea8b7 (patch)
tree87a24a3487261ec6aeed6b8d95ff62f6ed69d260 /mm
parent3fda49e89f1702df6bb6a2470076b1a7bf3a29de (diff)
downloadlinux-b5665cf936bf3955fec18c09a6aa53c8a57ea8b7.tar.xz
mm: backing-dev: make bdi_class a static const structure
Now that the driver core allows for struct class to be in read-only memory, move the bdi_class structure to be declared at build time placing it into read-only memory, instead of having to be dynamically allocated at load time. Link: https://lkml.kernel.org/r/20230620183314.682822-2-gregkh@linuxfoundation.org Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/backing-dev.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 7da9727fcdf3..3ffc3cfa7a14 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -20,7 +20,6 @@
struct backing_dev_info noop_backing_dev_info;
EXPORT_SYMBOL_GPL(noop_backing_dev_info);
-static struct class *bdi_class;
static const char *bdi_unknown_name = "(unknown)";
/*
@@ -345,13 +344,19 @@ static struct attribute *bdi_dev_attrs[] = {
};
ATTRIBUTE_GROUPS(bdi_dev);
+static const struct class bdi_class = {
+ .name = "bdi",
+ .dev_groups = bdi_dev_groups,
+};
+
static __init int bdi_class_init(void)
{
- bdi_class = class_create("bdi");
- if (IS_ERR(bdi_class))
- return PTR_ERR(bdi_class);
+ int ret;
+
+ ret = class_register(&bdi_class);
+ if (ret)
+ return ret;
- bdi_class->dev_groups = bdi_dev_groups;
bdi_debug_init();
return 0;
@@ -1001,7 +1006,7 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)
return 0;
vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args);
- dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
+ dev = device_create(&bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
if (IS_ERR(dev))
return PTR_ERR(dev);