From 68279f9c9f592e75d30a9ba5154a15e0a0b42ae8 Mon Sep 17 00:00:00 2001 From: Alexey Dobriyan Date: Wed, 11 Oct 2023 19:55:00 +0300 Subject: [PATCH] treewide: mark stuff as __ro_after_init __read_mostly predates __ro_after_init. Many variables which are marked __read_mostly should have been __ro_after_init from day 1. Also, mark some stuff as "const" and "__init" while I'm at it. [akpm@linux-foundation.org: revert sysctl_nr_open_min, sysctl_nr_open_max changes due to arm warning] [akpm@linux-foundation.org: coding-style cleanups] Link: https://lkml.kernel.org/r/4f6bb9c0-abba-4ee4-a7aa-89265e886817@p183 Signed-off-by: Alexey Dobriyan Signed-off-by: Andrew Morton --- block/bdev.c | 6 +++--- fs/anon_inodes.c | 4 ++-- fs/buffer.c | 4 ++-- fs/char_dev.c | 2 +- fs/dcache.c | 8 ++++---- fs/direct-io.c | 2 +- fs/eventpoll.c | 6 +++--- fs/fcntl.c | 2 +- fs/file_table.c | 2 +- fs/inode.c | 8 ++++---- fs/kernfs/mount.c | 5 +++-- fs/locks.c | 4 ++-- fs/namespace.c | 16 ++++++++-------- fs/notify/dnotify/dnotify.c | 6 +++--- fs/notify/fanotify/fanotify_user.c | 8 ++++---- fs/notify/inotify/inotify_user.c | 2 +- fs/pipe.c | 2 +- fs/userfaultfd.c | 2 +- kernel/audit_tree.c | 4 ++-- kernel/sched/core.c | 2 +- kernel/user_namespace.c | 2 +- kernel/workqueue.c | 16 ++++++++-------- lib/debugobjects.c | 2 +- mm/khugepaged.c | 2 +- mm/shmem.c | 8 ++++---- security/integrity/iint.c | 2 +- 26 files changed, 64 insertions(+), 63 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index f3b13aa1b7d4..aea9143d8908 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -292,7 +292,7 @@ EXPORT_SYMBOL(thaw_bdev); */ static __cacheline_aligned_in_smp DEFINE_MUTEX(bdev_lock); -static struct kmem_cache * bdev_cachep __read_mostly; +static struct kmem_cache *bdev_cachep __ro_after_init; static struct inode *bdev_alloc_inode(struct super_block *sb) { @@ -361,13 +361,13 @@ static struct file_system_type bd_type = { .kill_sb = kill_anon_super, }; -struct super_block *blockdev_superblock __read_mostly; +struct super_block *blockdev_superblock __ro_after_init; EXPORT_SYMBOL_GPL(blockdev_superblock); void __init bdev_cache_init(void) { int err; - static struct vfsmount *bd_mnt; + static struct vfsmount *bd_mnt __ro_after_init; bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode), 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c index 24192a7667ed..d26222b7eefe 100644 --- a/fs/anon_inodes.c +++ b/fs/anon_inodes.c @@ -24,8 +24,8 @@ #include -static struct vfsmount *anon_inode_mnt __read_mostly; -static struct inode *anon_inode_inode; +static struct vfsmount *anon_inode_mnt __ro_after_init; +static struct inode *anon_inode_inode __ro_after_init; /* * anon_inodefs_dname() is called from d_path(). diff --git a/fs/buffer.c b/fs/buffer.c index 12e9a71c693d..a19fef583116 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2988,13 +2988,13 @@ EXPORT_SYMBOL(try_to_free_buffers); /* * Buffer-head allocation */ -static struct kmem_cache *bh_cachep __read_mostly; +static struct kmem_cache *bh_cachep __ro_after_init; /* * Once the number of bh's in the machine exceeds this level, we start * stripping them in writeback. */ -static unsigned long max_buffer_heads; +static unsigned long max_buffer_heads __ro_after_init; int buffer_heads_over_limit; diff --git a/fs/char_dev.c b/fs/char_dev.c index 950b6919fb87..3d52f3d3ae77 100644 --- a/fs/char_dev.c +++ b/fs/char_dev.c @@ -25,7 +25,7 @@ #include "internal.h" -static struct kobj_map *cdev_map; +static struct kobj_map *cdev_map __ro_after_init; static DEFINE_MUTEX(chrdevs_lock); diff --git a/fs/dcache.c b/fs/dcache.c index 25ac74d30bff..0650ccdaa335 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -78,7 +78,7 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(rename_lock); EXPORT_SYMBOL(rename_lock); -static struct kmem_cache *dentry_cache __read_mostly; +static struct kmem_cache *dentry_cache __ro_after_init; const struct qstr empty_name = QSTR_INIT("", 0); EXPORT_SYMBOL(empty_name); @@ -96,9 +96,9 @@ EXPORT_SYMBOL(dotdot_name); * information, yet avoid using a prime hash-size or similar. */ -static unsigned int d_hash_shift __read_mostly; +static unsigned int d_hash_shift __ro_after_init; -static struct hlist_bl_head *dentry_hashtable __read_mostly; +static struct hlist_bl_head *dentry_hashtable __ro_after_init; static inline struct hlist_bl_head *d_hash(unsigned int hash) { @@ -3324,7 +3324,7 @@ static void __init dcache_init(void) } /* SLAB cache for __getname() consumers */ -struct kmem_cache *names_cachep __read_mostly; +struct kmem_cache *names_cachep __ro_after_init; EXPORT_SYMBOL(names_cachep); void __init vfs_caches_init_early(void) diff --git a/fs/direct-io.c b/fs/direct-io.c index 7bc494ee56b9..20533266ade6 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -151,7 +151,7 @@ struct dio { }; } ____cacheline_aligned_in_smp; -static struct kmem_cache *dio_cache __read_mostly; +static struct kmem_cache *dio_cache __ro_after_init; /* * How many pages are in the queue? diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 1d9a71a0c4c1..2877cc01cff1 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -256,10 +256,10 @@ static u64 loop_check_gen = 0; static struct eventpoll *inserting_into; /* Slab cache used to allocate "struct epitem" */ -static struct kmem_cache *epi_cache __read_mostly; +static struct kmem_cache *epi_cache __ro_after_init; /* Slab cache used to allocate "struct eppoll_entry" */ -static struct kmem_cache *pwq_cache __read_mostly; +static struct kmem_cache *pwq_cache __ro_after_init; /* * List of files with newly added links, where we may need to limit the number @@ -271,7 +271,7 @@ struct epitems_head { }; static struct epitems_head *tfile_check_list = EP_UNACTIVE_PTR; -static struct kmem_cache *ephead_cache __read_mostly; +static struct kmem_cache *ephead_cache __ro_after_init; static inline void free_ephead(struct epitems_head *head) { diff --git a/fs/fcntl.c b/fs/fcntl.c index e871009f6c88..c80a6acad742 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -844,7 +844,7 @@ int send_sigurg(struct fown_struct *fown) } static DEFINE_SPINLOCK(fasync_lock); -static struct kmem_cache *fasync_cache __read_mostly; +static struct kmem_cache *fasync_cache __ro_after_init; static void fasync_free_rcu(struct rcu_head *head) { diff --git a/fs/file_table.c b/fs/file_table.c index ee21b3da9d08..687d33865035 100644 --- a/fs/file_table.c +++ b/fs/file_table.c @@ -40,7 +40,7 @@ static struct files_stat_struct files_stat = { }; /* SLAB cache for file structures */ -static struct kmem_cache *filp_cachep __read_mostly; +static struct kmem_cache *filp_cachep __ro_after_init; static struct percpu_counter nr_files __cacheline_aligned_in_smp; diff --git a/fs/inode.c b/fs/inode.c index 84bc3c76e5cc..2b1d473a3631 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -54,9 +54,9 @@ * inode_hash_lock */ -static unsigned int i_hash_mask __read_mostly; -static unsigned int i_hash_shift __read_mostly; -static struct hlist_head *inode_hashtable __read_mostly; +static unsigned int i_hash_mask __ro_after_init; +static unsigned int i_hash_shift __ro_after_init; +static struct hlist_head *inode_hashtable __ro_after_init; static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock); /* @@ -70,7 +70,7 @@ EXPORT_SYMBOL(empty_aops); static DEFINE_PER_CPU(unsigned long, nr_inodes); static DEFINE_PER_CPU(unsigned long, nr_unused); -static struct kmem_cache *inode_cachep __read_mostly; +static struct kmem_cache *inode_cachep __ro_after_init; static long get_nr_inodes(void) { diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index c4bf26142eec..43aea0ad95c8 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -21,8 +21,9 @@ #include "kernfs-internal.h" -struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache; -struct kernfs_global_locks *kernfs_locks; +struct kmem_cache *kernfs_node_cache __ro_after_init; +struct kmem_cache *kernfs_iattrs_cache __ro_after_init; +struct kernfs_global_locks *kernfs_locks __ro_after_init; static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry) { diff --git a/fs/locks.c b/fs/locks.c index 76ad05f8070a..dbd2fb1f7494 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -167,8 +167,8 @@ static DEFINE_HASHTABLE(blocked_hash, BLOCKED_HASH_BITS); */ static DEFINE_SPINLOCK(blocked_lock_lock); -static struct kmem_cache *flctx_cache __read_mostly; -static struct kmem_cache *filelock_cache __read_mostly; +static struct kmem_cache *flctx_cache __ro_after_init; +static struct kmem_cache *filelock_cache __ro_after_init; static struct file_lock_context * locks_get_lock_context(struct inode *inode, int type) diff --git a/fs/namespace.c b/fs/namespace.c index e157efc54023..69df848fbc17 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -39,10 +39,10 @@ /* Maximum number of mounts in a mount namespace */ static unsigned int sysctl_mount_max __read_mostly = 100000; -static unsigned int m_hash_mask __read_mostly; -static unsigned int m_hash_shift __read_mostly; -static unsigned int mp_hash_mask __read_mostly; -static unsigned int mp_hash_shift __read_mostly; +static unsigned int m_hash_mask __ro_after_init; +static unsigned int m_hash_shift __ro_after_init; +static unsigned int mp_hash_mask __ro_after_init; +static unsigned int mp_hash_shift __ro_after_init; static __initdata unsigned long mhash_entries; static int __init set_mhash_entries(char *str) @@ -68,9 +68,9 @@ static u64 event; static DEFINE_IDA(mnt_id_ida); static DEFINE_IDA(mnt_group_ida); -static struct hlist_head *mount_hashtable __read_mostly; -static struct hlist_head *mountpoint_hashtable __read_mostly; -static struct kmem_cache *mnt_cache __read_mostly; +static struct hlist_head *mount_hashtable __ro_after_init; +static struct hlist_head *mountpoint_hashtable __ro_after_init; +static struct kmem_cache *mnt_cache __ro_after_init; static DECLARE_RWSEM(namespace_sem); static HLIST_HEAD(unmounted); /* protected by namespace_sem */ static LIST_HEAD(ex_mountpoints); /* protected by namespace_sem */ @@ -86,7 +86,7 @@ struct mount_kattr { }; /* /sys/fs */ -struct kobject *fs_kobj; +struct kobject *fs_kobj __ro_after_init; EXPORT_SYMBOL_GPL(fs_kobj); /* diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c index ebdcc25df0f7..7914d223289a 100644 --- a/fs/notify/dnotify/dnotify.c +++ b/fs/notify/dnotify/dnotify.c @@ -39,9 +39,9 @@ static void __init dnotify_sysctl_init(void) #define dnotify_sysctl_init() do { } while (0) #endif -static struct kmem_cache *dnotify_struct_cache __read_mostly; -static struct kmem_cache *dnotify_mark_cache __read_mostly; -static struct fsnotify_group *dnotify_group __read_mostly; +static struct kmem_cache *dnotify_struct_cache __ro_after_init; +static struct kmem_cache *dnotify_mark_cache __ro_after_init; +static struct fsnotify_group *dnotify_group __ro_after_init; /* * dnotify will attach one of these to each inode (i_fsnotify_marks) which diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index f69c451018e3..614b435c4a8c 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -112,10 +112,10 @@ static void __init fanotify_sysctls_init(void) extern const struct fsnotify_ops fanotify_fsnotify_ops; -struct kmem_cache *fanotify_mark_cache __read_mostly; -struct kmem_cache *fanotify_fid_event_cachep __read_mostly; -struct kmem_cache *fanotify_path_event_cachep __read_mostly; -struct kmem_cache *fanotify_perm_event_cachep __read_mostly; +struct kmem_cache *fanotify_mark_cache __ro_after_init; +struct kmem_cache *fanotify_fid_event_cachep __ro_after_init; +struct kmem_cache *fanotify_path_event_cachep __ro_after_init; +struct kmem_cache *fanotify_perm_event_cachep __ro_after_init; #define FANOTIFY_EVENT_ALIGN 4 #define FANOTIFY_FID_INFO_HDR_LEN \ diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c index 1c4bfdab008d..a3809ae92170 100644 --- a/fs/notify/inotify/inotify_user.c +++ b/fs/notify/inotify/inotify_user.c @@ -49,7 +49,7 @@ /* configurable via /proc/sys/fs/inotify/ */ static int inotify_max_queued_events __read_mostly; -struct kmem_cache *inotify_inode_mark_cachep __read_mostly; +struct kmem_cache *inotify_inode_mark_cachep __ro_after_init; #ifdef CONFIG_SYSCTL diff --git a/fs/pipe.c b/fs/pipe.c index 139190165a1c..6b279abf0129 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -854,7 +854,7 @@ void free_pipe_info(struct pipe_inode_info *pipe) kfree(pipe); } -static struct vfsmount *pipe_mnt __read_mostly; +static struct vfsmount *pipe_mnt __ro_after_init; /* * pipefs_dname() is called from d_path(). diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 56eaae9dac1a..ed09d70027a0 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -49,7 +49,7 @@ static struct ctl_table vm_userfaultfd_table[] = { }; #endif -static struct kmem_cache *userfaultfd_ctx_cachep __read_mostly; +static struct kmem_cache *userfaultfd_ctx_cachep __ro_after_init; /* * Start with fault_pending_wqh and fault_wqh so they're more likely diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c index e867c17d3f84..b21b9652c1a8 100644 --- a/kernel/audit_tree.c +++ b/kernel/audit_tree.c @@ -87,8 +87,8 @@ static struct task_struct *prune_thread; * that makes a difference. Some. */ -static struct fsnotify_group *audit_tree_group; -static struct kmem_cache *audit_tree_mark_cachep __read_mostly; +static struct fsnotify_group *audit_tree_group __ro_after_init; +static struct kmem_cache *audit_tree_mark_cachep __ro_after_init; static struct audit_tree *alloc_tree(const char *s) { diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 802551e0009b..7d4cf741e087 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -9903,7 +9903,7 @@ struct task_group root_task_group; LIST_HEAD(task_groups); /* Cacheline aligned slab cache for task_group */ -static struct kmem_cache *task_group_cache __read_mostly; +static struct kmem_cache *task_group_cache __ro_after_init; #endif void __init sched_init(void) diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 1d8e47bed3f1..bf2cb8c11571 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -22,7 +22,7 @@ #include #include -static struct kmem_cache *user_ns_cachep __read_mostly; +static struct kmem_cache *user_ns_cachep __ro_after_init; static DEFINE_MUTEX(userns_state_mutex); static bool new_idmap_permitted(const struct file *file, diff --git a/kernel/workqueue.c b/kernel/workqueue.c index b9f053a5a5f0..96b89f0edbe3 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -418,21 +418,21 @@ static struct workqueue_attrs *ordered_wq_attrs[NR_STD_WORKER_POOLS]; * process context while holding a pool lock. Bounce to a dedicated kthread * worker to avoid A-A deadlocks. */ -static struct kthread_worker *pwq_release_worker; +static struct kthread_worker *pwq_release_worker __ro_after_init; -struct workqueue_struct *system_wq __read_mostly; +struct workqueue_struct *system_wq __ro_after_init; EXPORT_SYMBOL(system_wq); -struct workqueue_struct *system_highpri_wq __read_mostly; +struct workqueue_struct *system_highpri_wq __ro_after_init; EXPORT_SYMBOL_GPL(system_highpri_wq); -struct workqueue_struct *system_long_wq __read_mostly; +struct workqueue_struct *system_long_wq __ro_after_init; EXPORT_SYMBOL_GPL(system_long_wq); -struct workqueue_struct *system_unbound_wq __read_mostly; +struct workqueue_struct *system_unbound_wq __ro_after_init; EXPORT_SYMBOL_GPL(system_unbound_wq); -struct workqueue_struct *system_freezable_wq __read_mostly; +struct workqueue_struct *system_freezable_wq __ro_after_init; EXPORT_SYMBOL_GPL(system_freezable_wq); -struct workqueue_struct *system_power_efficient_wq __read_mostly; +struct workqueue_struct *system_power_efficient_wq __ro_after_init; EXPORT_SYMBOL_GPL(system_power_efficient_wq); -struct workqueue_struct *system_freezable_power_efficient_wq __read_mostly; +struct workqueue_struct *system_freezable_power_efficient_wq __ro_after_init; EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq); static int worker_thread(void *__worker); diff --git a/lib/debugobjects.c b/lib/debugobjects.c index a517256a270b..2a8e9d63fbe3 100644 --- a/lib/debugobjects.c +++ b/lib/debugobjects.c @@ -89,7 +89,7 @@ static int debug_objects_pool_size __read_mostly static int debug_objects_pool_min_level __read_mostly = ODEBUG_POOL_MIN_LEVEL; static const struct debug_obj_descr *descr_test __read_mostly; -static struct kmem_cache *obj_cache __read_mostly; +static struct kmem_cache *obj_cache __ro_after_init; /* * Track numbers of kmem_cache_alloc()/free() calls done. diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 88433cc25d8a..cb3f1d738810 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -91,7 +91,7 @@ static unsigned int khugepaged_max_ptes_shared __read_mostly; #define MM_SLOTS_HASH_BITS 10 static DEFINE_READ_MOSTLY_HASHTABLE(mm_slots_hash, MM_SLOTS_HASH_BITS); -static struct kmem_cache *mm_slot_cache __read_mostly; +static struct kmem_cache *mm_slot_cache __ro_after_init; struct collapse_control { bool is_khugepaged; diff --git a/mm/shmem.c b/mm/shmem.c index 69595d341882..389212972e72 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -42,7 +42,7 @@ #include #include "swap.h" -static struct vfsmount *shm_mnt; +static struct vfsmount *shm_mnt __ro_after_init; #ifdef CONFIG_SHMEM /* @@ -4394,7 +4394,7 @@ static const struct fs_context_operations shmem_fs_context_ops = { #endif }; -static struct kmem_cache *shmem_inode_cachep; +static struct kmem_cache *shmem_inode_cachep __ro_after_init; static struct inode *shmem_alloc_inode(struct super_block *sb) { @@ -4426,14 +4426,14 @@ static void shmem_init_inode(void *foo) inode_init_once(&info->vfs_inode); } -static void shmem_init_inodecache(void) +static void __init shmem_init_inodecache(void) { shmem_inode_cachep = kmem_cache_create("shmem_inode_cache", sizeof(struct shmem_inode_info), 0, SLAB_PANIC|SLAB_ACCOUNT, shmem_init_inode); } -static void shmem_destroy_inodecache(void) +static void __init shmem_destroy_inodecache(void) { kmem_cache_destroy(shmem_inode_cachep); } diff --git a/security/integrity/iint.c b/security/integrity/iint.c index a462df827de2..5b1c2de6cc54 100644 --- a/security/integrity/iint.c +++ b/security/integrity/iint.c @@ -23,7 +23,7 @@ static struct rb_root integrity_iint_tree = RB_ROOT; static DEFINE_RWLOCK(integrity_iint_lock); -static struct kmem_cache *iint_cache __read_mostly; +static struct kmem_cache *iint_cache __ro_after_init; struct dentry *integrity_dir;