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[46.135.14.82]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429dc2007afsm11436499f8f.44.2025.11.05.07.36.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Nov 2025 07:36:26 -0800 (PST) From: Mateusz Guzik To: brauner@kernel.org Cc: viro@zeniv.linux.org.uk, jack@suse.cz, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Mateusz Guzik Subject: [PATCH] fs: hide dentry_cache behind runtime const machinery Date: Wed, 5 Nov 2025 16:36:22 +0100 Message-ID: <20251105153622.758836-1-mjguzik@gmail.com> X-Mailer: git-send-email 2.43.0 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" Signed-off-by: Mateusz Guzik --- fs/dcache.c | 6 ++++-- include/asm-generic/vmlinux.lds.h | 3 ++- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/dcache.c b/fs/dcache.c index de3e4e9777ea..531835e8637c 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -86,7 +86,8 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(rename_lock); =20 EXPORT_SYMBOL(rename_lock); =20 -static struct kmem_cache *dentry_cache __ro_after_init; +static struct kmem_cache *__dentry_cache __ro_after_init; +#define dentry_cache runtime_const_ptr(__dentry_cache) =20 const struct qstr empty_name =3D QSTR_INIT("", 0); EXPORT_SYMBOL(empty_name); @@ -3216,9 +3217,10 @@ static void __init dcache_init(void) * but it is probably not worth it because of the cache nature * of the dcache. */ - dentry_cache =3D KMEM_CACHE_USERCOPY(dentry, + __dentry_cache =3D KMEM_CACHE_USERCOPY(dentry, SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_ACCOUNT, d_shortname.string); + runtime_const_init(ptr, __dentry_cache); =20 /* Hash may have been set up in dcache_init_early */ if (!hashdist) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinu= x.lds.h index e04d56a5332e..caef183a73bc 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -955,7 +955,8 @@ defined(CONFIG_AUTOFDO_CLANG) || defined(CONFIG_PROPELL= ER_CLANG) =20 #define RUNTIME_CONST_VARIABLES \ RUNTIME_CONST(shift, d_hash_shift) \ - RUNTIME_CONST(ptr, dentry_hashtable) + RUNTIME_CONST(ptr, dentry_hashtable) \ + RUNTIME_CONST(ptr, __dentry_cache) =20 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test= .h */ #define KUNIT_TABLE() \ --=20 2.48.1