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[2a00:1028:83b8:1e7a:3010:3bd6:8521:caf1]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-429898ec1dfsm10336995f8f.43.2025.10.24.10.07.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Oct 2025 10:07:03 -0700 (PDT) From: Petr Tesarik To: Vlastimil Babka , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Petr Tesarik Subject: [PATCH 1/3] slab: constify slab debug strings Date: Fri, 24 Oct 2025 19:06:52 +0200 Message-ID: <819095b921f6ae03bb54fd69ee4020e2a3aef675.1761324765.git.ptesarik@suse.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Harry Yoo --- mm/slub.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 708848d3512c5..26faebcf27a2b 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -978,7 +978,7 @@ static slab_flags_t slub_debug =3D DEBUG_DEFAULT_FLAGS; static slab_flags_t slub_debug; #endif =20 -static char *slub_debug_string; +static const char *slub_debug_string __ro_after_init; static int disable_higher_order_debug; =20 /* @@ -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 =3D false; =20 @@ -1863,14 +1863,15 @@ parse_slub_debug_flags(char *str, slab_flags_t *fla= gs, char **slabs, bool init) return NULL; } =20 -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 =3D false; bool slab_list_specified =3D false; + const char *str =3D val; =20 global_flags =3D DEBUG_DEFAULT_FLAGS; if (*str++ !=3D '=3D' || !*str) @@ -1935,9 +1936,9 @@ __setup_param("slub_debug", slub_debug, setup_slub_de= bug, 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 =3D slub_debug; =20 @@ -1961,7 +1962,7 @@ slab_flags_t kmem_cache_flags(slab_flags_t flags, con= st 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; =20 end =3D strchrnul(iter, ','); --=20 2.51.0