diff options
author | Jason Low <jason.low2@hp.com> | 2014-01-13 00:31:22 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2014-01-13 11:45:17 +0100 |
commit | 0d00c7b20c7716ce08399570ea48813ecf001aa8 (patch) | |
tree | a94b3f78d7766514672f3feb165fa9e848a4527e /kernel/futex.c | |
parent | Merge tag 'v3.13-rc8' into core/locking (diff) | |
download | linux-0d00c7b20c7716ce08399570ea48813ecf001aa8.tar.xz linux-0d00c7b20c7716ce08399570ea48813ecf001aa8.zip |
futexes: Clean up various details
- Remove unnecessary head variables.
- Delete unused parameter in queue_unlock().
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Reviewed-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jason Low <jason.low2@hp.com>
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Scott Norton <scott.norton@hp.com>
Cc: Tom Vaden <tom.vaden@hp.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Cc: Waiman Long <Waiman.Long@hp.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1389569486-25487-2-git-send-email-davidlohr@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/futex.c')
-rw-r--r-- | kernel/futex.c | 39 |
1 files changed, 12 insertions, 27 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index f6ff0191ecf7..085f5fa0b342 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -598,13 +598,10 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb, { struct futex_pi_state *pi_state = NULL; struct futex_q *this, *next; - struct plist_head *head; struct task_struct *p; pid_t pid = uval & FUTEX_TID_MASK; - head = &hb->chain; - - plist_for_each_entry_safe(this, next, head, list) { + plist_for_each_entry_safe(this, next, &hb->chain, list) { if (match_futex(&this->key, key)) { /* * Another waiter already exists - bump up @@ -986,7 +983,6 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset) { struct futex_hash_bucket *hb; struct futex_q *this, *next; - struct plist_head *head; union futex_key key = FUTEX_KEY_INIT; int ret; @@ -999,9 +995,8 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset) hb = hash_futex(&key); spin_lock(&hb->lock); - head = &hb->chain; - plist_for_each_entry_safe(this, next, head, list) { + plist_for_each_entry_safe(this, next, &hb->chain, list) { if (match_futex (&this->key, &key)) { if (this->pi_state || this->rt_waiter) { ret = -EINVAL; @@ -1034,7 +1029,6 @@ futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2, { union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT; struct futex_hash_bucket *hb1, *hb2; - struct plist_head *head; struct futex_q *this, *next; int ret, op_ret; @@ -1082,9 +1076,7 @@ retry_private: goto retry; } - head = &hb1->chain; - - plist_for_each_entry_safe(this, next, head, list) { + plist_for_each_entry_safe(this, next, &hb1->chain, list) { if (match_futex (&this->key, &key1)) { if (this->pi_state || this->rt_waiter) { ret = -EINVAL; @@ -1097,10 +1089,8 @@ retry_private: } if (op_ret > 0) { - head = &hb2->chain; - op_ret = 0; - plist_for_each_entry_safe(this, next, head, list) { + plist_for_each_entry_safe(this, next, &hb2->chain, list) { if (match_futex (&this->key, &key2)) { if (this->pi_state || this->rt_waiter) { ret = -EINVAL; @@ -1270,7 +1260,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags, int drop_count = 0, task_count = 0, ret; struct futex_pi_state *pi_state = NULL; struct futex_hash_bucket *hb1, *hb2; - struct plist_head *head1; struct futex_q *this, *next; u32 curval2; @@ -1393,8 +1382,7 @@ retry_private: } } - head1 = &hb1->chain; - plist_for_each_entry_safe(this, next, head1, list) { + plist_for_each_entry_safe(this, next, &hb1->chain, list) { if (task_count - nr_wake >= nr_requeue) break; @@ -1494,7 +1482,7 @@ static inline struct futex_hash_bucket *queue_lock(struct futex_q *q) } static inline void -queue_unlock(struct futex_q *q, struct futex_hash_bucket *hb) +queue_unlock(struct futex_hash_bucket *hb) __releases(&hb->lock) { spin_unlock(&hb->lock); @@ -1867,7 +1855,7 @@ retry_private: ret = get_futex_value_locked(&uval, uaddr); if (ret) { - queue_unlock(q, *hb); + queue_unlock(*hb); ret = get_user(uval, uaddr); if (ret) @@ -1881,7 +1869,7 @@ retry_private: } if (uval != val) { - queue_unlock(q, *hb); + queue_unlock(*hb); ret = -EWOULDBLOCK; } @@ -2029,7 +2017,7 @@ retry_private: * Task is exiting and we just wait for the * exit to complete. */ - queue_unlock(&q, hb); + queue_unlock(hb); put_futex_key(&q.key); cond_resched(); goto retry; @@ -2081,7 +2069,7 @@ retry_private: goto out_put_key; out_unlock_put_key: - queue_unlock(&q, hb); + queue_unlock(hb); out_put_key: put_futex_key(&q.key); @@ -2091,7 +2079,7 @@ out: return ret != -EINTR ? ret : -ERESTARTNOINTR; uaddr_faulted: - queue_unlock(&q, hb); + queue_unlock(hb); ret = fault_in_user_writeable(uaddr); if (ret) @@ -2113,7 +2101,6 @@ static int futex_unlock_pi(u32 __user *uaddr, unsigned int flags) { struct futex_hash_bucket *hb; struct futex_q *this, *next; - struct plist_head *head; union futex_key key = FUTEX_KEY_INIT; u32 uval, vpid = task_pid_vnr(current); int ret; @@ -2153,9 +2140,7 @@ retry: * Ok, other tasks may need to be woken up - check waiters * and do the wakeup if necessary: */ - head = &hb->chain; - - plist_for_each_entry_safe(this, next, head, list) { + plist_for_each_entry_safe(this, next, &hb->chain, list) { if (!match_futex (&this->key, &key)) continue; ret = wake_futex_pi(uaddr, uval, this); |