crash_dump: constify struct configfs_item_operations and configfs_group_operations

'struct configfs_item_operations' and 'configfs_group_operations' are not
modified in this driver.

Constifying these structures moves some data to a read-only section, so
increases overall security, especially when the structure holds some
function pointers.

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  16339	  11001	    384	  27724	   6c4c	kernel/crash_dump_dm_crypt.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  16499	  10841	    384	  27724	   6c4c	kernel/crash_dump_dm_crypt.o

Link: https://lkml.kernel.org/r/d046ee5666d2f6b1a48ca1a222dfbd2f7c44462f.1765735035.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Coiby Xu <coxu@redhat.com>
Tested-by: Coiby Xu <coxu@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/kernel/crash_dump_dm_crypt.c b/kernel/crash_dump_dm_crypt.c
index 401423ba477da038d30037c98025be561f8bfea2..0d23dc1de67c9a0d8e3eaf6edd49743535380e40 100644 (file)
--- a/kernel/crash_dump_dm_crypt.c
+++ b/kernel/crash_dump_dm_crypt.c
@@ -223,7 +223,7 @@ static void config_key_release(struct config_item *item)
        key_count--;
 }
 
-static struct configfs_item_operations config_key_item_ops = {
+static const struct configfs_item_operations config_key_item_ops = {
        .release = config_key_release,
 };
 
@@ -298,7 +298,7 @@ static struct configfs_attribute *config_keys_attrs[] = {
  * Note that, since no extra work is required on ->drop_item(),
  * no ->drop_item() is provided.
  */
-static struct configfs_group_operations config_keys_group_ops = {
+static const struct configfs_group_operations config_keys_group_ops = {
        .make_item = config_keys_make_item,
 };