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params: Prepare for 'const struct module_attribute *'

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The 'struct module_attribute' sysfs callbacks are about to change to
receive a 'const struct module_attribute *' parameter.
Prepare for that by avoid casting away the constness through
container_of() and using const pointers to 'struct param_attribute'.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Link: https://lore.kernel.org/r/20241216-sysfs-const-attr-module-v1-1-3790b53e0abf@weissschuh.net
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
This commit is contained in:
Thomas Weißschuh
2024-12-16 18:25:08 +01:00
committed by Petr Pavlu
parent c8e0bd579e
commit 30d4460888
1 changed files with 3 additions and 3 deletions
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6
kernel/params.c
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@@ -555,13 +555,13 @@ struct module_param_attrs
};
#ifdef CONFIG_SYSFS
#define to_param_attr(n) container_of(n, struct param_attribute, mattr)
#define to_param_attr(n) container_of_const(n, struct param_attribute, mattr)
static ssize_t param_attr_show(struct module_attribute *mattr,
struct module_kobject *mk, char *buf)
{
int count;
struct param_attribute *attribute = to_param_attr(mattr);
const struct param_attribute *attribute = to_param_attr(mattr);
if (!attribute->param->ops->get)
return -EPERM;
@@ -578,7 +578,7 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
const char *buf, size_t len)
{
int err;
struct param_attribute *attribute = to_param_attr(mattr);
const struct param_attribute *attribute = to_param_attr(mattr);
if (!attribute->param->ops->set)
return -EPERM;