sysctl: treewide: constify argument ctl_table_root::permissions(table)

The permissions callback should not modify the ctl_table. Enforce this
expectation via the typesystem. This is a step to put "struct ctl_table"
into .rodata throughout the kernel.

The patch was created with the following coccinelle script:

  @@
  identifier func, head, ctl;
  @@

  int func(
    struct ctl_table_header *head,
  - struct ctl_table *ctl)
  + const struct ctl_table *ctl)
  { ... }

(insert_entry() from fs/proc/proc_sysctl.c is a false-positive)

No additional occurrences of '.permissions =' were found after a
tree-wide search for places missed by the conccinelle script.

Reviewed-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Joel Granados <j.granados@samsung.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 60333a6b9370..f9214de0490c 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -206,7 +206,7 @@ struct ctl_table_root {
 	struct ctl_table_set *(*lookup)(struct ctl_table_root *root);
 	void (*set_ownership)(struct ctl_table_header *head,
 			      kuid_t *uid, kgid_t *gid);
-	int (*permissions)(struct ctl_table_header *head, struct ctl_table *table);
+	int (*permissions)(struct ctl_table_header *head, const struct ctl_table *table);
 };
 
 #define register_sysctl(path, table)	\