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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-01 13:03:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-01 13:03:31 -0700
commit60056060bede58c3073dccb8a5e73a6c40804aa9 (patch)
tree93097df99142146627f5c01d01cdab77a271185a /kernel/locking
parent2227e5b21aec6c5f7f6491352f0c19fd02d19418 (diff)
parent19f545b6e07f753c4dc639c2f0ab52345733b6a8 (diff)
downloadlinux-60056060bede58c3073dccb8a5e73a6c40804aa9.tar.bz2
Merge tag 'locking-core-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar: "The biggest change to core locking facilities in this cycle is the introduction of local_lock_t - this primitive comes from the -rt project and identifies CPU-local locking dependencies normally handled opaquely beind preempt_disable() or local_irq_save/disable() critical sections. The generated code on mainline kernels doesn't change as a result, but still there are benefits: improved debugging and better documentation of data structure accesses. The new local_lock_t primitives are introduced and then utilized in a couple of kernel subsystems. No change in functionality is intended. There's also other smaller changes and cleanups" * tag 'locking-core-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: zram: Use local lock to protect per-CPU data zram: Allocate struct zcomp_strm as per-CPU memory connector/cn_proc: Protect send_msg() with a local lock squashfs: Make use of local lock in multi_cpu decompressor mm/swap: Use local_lock for protection radix-tree: Use local_lock for protection locking: Introduce local_lock() locking/lockdep: Replace zero-length array with flexible-array locking/rtmutex: Remove unused rt_mutex_cmpxchg_relaxed()
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/lockdep.c2
-rw-r--r--kernel/locking/rtmutex.c2
2 files changed, 1 insertions, 3 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 6f1c8cba09c6..dd3cc0854c32 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -470,7 +470,7 @@ struct lock_trace {
struct hlist_node hash_entry;
u32 hash;
u32 nr_entries;
- unsigned long entries[0] __aligned(sizeof(unsigned long));
+ unsigned long entries[] __aligned(sizeof(unsigned long));
};
#define LOCK_TRACE_SIZE_IN_LONGS \
(sizeof(struct lock_trace) / sizeof(unsigned long))
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index c9f090d64f00..cfdd5b93264d 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -141,7 +141,6 @@ static void fixup_rt_mutex_waiters(struct rt_mutex *lock)
* set up.
*/
#ifndef CONFIG_DEBUG_RT_MUTEXES
-# define rt_mutex_cmpxchg_relaxed(l,c,n) (cmpxchg_relaxed(&l->owner, c, n) == c)
# define rt_mutex_cmpxchg_acquire(l,c,n) (cmpxchg_acquire(&l->owner, c, n) == c)
# define rt_mutex_cmpxchg_release(l,c,n) (cmpxchg_release(&l->owner, c, n) == c)
@@ -202,7 +201,6 @@ static inline bool unlock_rt_mutex_safe(struct rt_mutex *lock,
}
#else
-# define rt_mutex_cmpxchg_relaxed(l,c,n) (0)
# define rt_mutex_cmpxchg_acquire(l,c,n) (0)
# define rt_mutex_cmpxchg_release(l,c,n) (0)