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slab: constify slab debug strings 

Since the string passed to slab_debug is never modified, use pointers to
const char in all places where it is processed.

No functional changes intended.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Christoph Lameter <cl@gentwo.org>
Link: https://patch.msgid.link/819095b921f6ae03bb54fd69ee4020e2a3aef675.1761324765.git.ptesarik@suse.com
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Petr Tesarik 2025-10-24 19:06:52 +02:00 committed by Vlastimil Babka
parent dcb6fa37fd
commit d3722ff57e
1 changed files with 10 additions and 9 deletions
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19
mm/slub.c
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@ -978,7 +978,7 @@ static slab_flags_t slub_debug = DEBUG_DEFAULT_FLAGS;
static slab_flags_t slub_debug;
#endif
static char *slub_debug_string;
static const char *slub_debug_string __ro_after_init;
static int disable_higher_order_debug;
/*
@ -1785,8 +1785,8 @@ static inline int free_consistency_checks(struct kmem_cache *s,
*
* returns the start of next block if there's any, or NULL
*/
static char *
parse_slub_debug_flags(char *str, slab_flags_t *flags, char **slabs, bool init)
static const char *
parse_slub_debug_flags(const char *str, slab_flags_t *flags, const char **slabs, bool init)
{
bool higher_order_disable = false;
@ -1863,14 +1863,15 @@ parse_slub_debug_flags(char *str, slab_flags_t *flags, char **slabs, bool init)
return NULL;
}
static int __init setup_slub_debug(char *str)
static int __init setup_slub_debug(char *val)
{
slab_flags_t flags;
slab_flags_t global_flags;
char *saved_str;
char *slab_list;
const char *saved_str;
const char *slab_list;
bool global_slub_debug_changed = false;
bool slab_list_specified = false;
const char *str = val;
global_flags = DEBUG_DEFAULT_FLAGS;
if (*str++ != '=' || !*str)
@ -1935,9 +1936,9 @@ __setup_param("slub_debug", slub_debug, setup_slub_debug, 0);
*/
slab_flags_t kmem_cache_flags(slab_flags_t flags, const char *name)
{
char *iter;
const char *iter;
size_t len;
char *next_block;
const char *next_block;
slab_flags_t block_flags;
slab_flags_t slub_debug_local = slub_debug;
@ -1961,7 +1962,7 @@ slab_flags_t kmem_cache_flags(slab_flags_t flags, const char *name)
continue;
/* Found a block that has a slab list, search it */
while (*iter) {
char *end, *glob;
const char *end, *glob;
size_t cmplen;
end = strchrnul(iter, ',');