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mm: backing-dev: make bdi_class a static const structure

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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>
This commit is contained in:
Ivan Orlov 2023-06-20 20:33:15 +02:00 committed by Andrew Morton
parent 3fda49e89f
commit b5665cf936
1 changed files with 11 additions and 6 deletions
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17
mm/backing-dev.c
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@ -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);