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lockdep: Make lockdep checking constant

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There are several places in the kernel which would like to pass a const
pointer to lockdep_is_held().  Constify the entire path so nobody has to
trick the compiler.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Link: https://lkml.kernel.org/r/20180117151414.23686-3-willy@infradead.org
This commit is contained in:
Matthew Wilcox 2018-01-17 07:14:13 -08:00 committed by Thomas Gleixner
parent 64f29d1bc9
commit 08f36ff642
2 changed files with 9 additions and 8 deletions
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4
include/linux/lockdep.h
View file

@ -337,9 +337,9 @@ extern void lock_release(struct lockdep_map *lock, int nested,
/*
* Same "read" as for lock_acquire(), except -1 means any.
*/
extern int lock_is_held_type(struct lockdep_map *lock, int read);
extern int lock_is_held_type(const struct lockdep_map *lock, int read);
static inline int lock_is_held(struct lockdep_map *lock)
static inline int lock_is_held(const struct lockdep_map *lock)
{
return lock_is_held_type(lock, -1);
}

13
kernel/locking/lockdep.c
View file

@ -648,7 +648,7 @@ static int count_matching_names(struct lock_class *new_class)
}
static inline struct lock_class *
look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
look_up_lock_class(const struct lockdep_map *lock, unsigned int subclass)
{
struct lockdep_subclass_key *key;
struct hlist_head *hash_head;
@ -3276,7 +3276,7 @@ print_lock_nested_lock_not_held(struct task_struct *curr,
return 0;
}
static int __lock_is_held(struct lockdep_map *lock, int read);
static int __lock_is_held(const struct lockdep_map *lock, int read);
/*
* This gets called for every mutex_lock*()/spin_lock*() operation.
@ -3485,13 +3485,14 @@ print_unlock_imbalance_bug(struct task_struct *curr, struct lockdep_map *lock,
return 0;
}
static int match_held_lock(struct held_lock *hlock, struct lockdep_map *lock)
static int match_held_lock(const struct held_lock *hlock,
const struct lockdep_map *lock)
{
if (hlock->instance == lock)
return 1;
if (hlock->references) {
struct lock_class *class = lock->class_cache[0];
const struct lock_class *class = lock->class_cache[0];
if (!class)
class = look_up_lock_class(lock, 0);
@ -3727,7 +3728,7 @@ __lock_release(struct lockdep_map *lock, int nested, unsigned long ip)
return 1;
}
static int __lock_is_held(struct lockdep_map *lock, int read)
static int __lock_is_held(const struct lockdep_map *lock, int read)
{
struct task_struct *curr = current;
int i;
@ -3941,7 +3942,7 @@ void lock_release(struct lockdep_map *lock, int nested,
}
EXPORT_SYMBOL_GPL(lock_release);
int lock_is_held_type(struct lockdep_map *lock, int read)
int lock_is_held_type(const struct lockdep_map *lock, int read)
{
unsigned long flags;
int ret = 0;