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futex: Cleanup variable names for futex_top_waiter() 

futex_top_waiter() returns the top-waiter on the pi_mutex. Assinging
this to a variable 'match' totally obscures the code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: juri.lelli@arm.com
Cc: bigeasy@linutronix.de
Cc: xlpang@redhat.com
Cc: rostedt@goodmis.org
Cc: mathieu.desnoyers@efficios.com
Cc: jdesfossez@efficios.com
Cc: dvhart@infradead.org
Cc: bristot@redhat.com
Link: http://lkml.kernel.org/r/20170322104151.554710645@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Peter Zijlstra 2017-03-22 11:35:48 +01:00 committed by Thomas Gleixner
parent e6790e4b5d
commit 499f5aca2c
1 changed files with 15 additions and 15 deletions
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30
kernel/futex.c
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@ -1122,14 +1122,14 @@ static int attach_to_pi_owner(u32 uval, union futex_key *key,
static int lookup_pi_state(u32 uval, struct futex_hash_bucket *hb, static int lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
union futex_key *key, struct futex_pi_state **ps) union futex_key *key, struct futex_pi_state **ps)
{ {
struct futex_q *match = futex_top_waiter(hb, key); struct futex_q *top_waiter = futex_top_waiter(hb, key);
/* /*
* If there is a waiter on that futex, validate it and * If there is a waiter on that futex, validate it and
* attach to the pi_state when the validation succeeds. * attach to the pi_state when the validation succeeds.
*/ */
if (match) if (top_waiter)
return attach_to_pi_state(uval, match->pi_state, ps); return attach_to_pi_state(uval, top_waiter->pi_state, ps);
/* /*
* We are the first waiter - try to look up the owner based on * We are the first waiter - try to look up the owner based on
@ -1176,7 +1176,7 @@ static int futex_lock_pi_atomic(u32 __user *uaddr, struct futex_hash_bucket *hb,
struct task_struct *task, int set_waiters) struct task_struct *task, int set_waiters)
{ {
u32 uval, newval, vpid = task_pid_vnr(task); u32 uval, newval, vpid = task_pid_vnr(task);
struct futex_q *match; struct futex_q *top_waiter;
int ret; int ret;
/* /*
@ -1202,9 +1202,9 @@ static int futex_lock_pi_atomic(u32 __user *uaddr, struct futex_hash_bucket *hb,
* Lookup existing state first. If it exists, try to attach to * Lookup existing state first. If it exists, try to attach to
* its pi_state. * its pi_state.
*/ */
match = futex_top_waiter(hb, key); top_waiter = futex_top_waiter(hb, key);
if (match) if (top_waiter)
return attach_to_pi_state(uval, match->pi_state, ps); return attach_to_pi_state(uval, top_waiter->pi_state, ps);
/* /*
* No waiter and user TID is 0. We are here because the * No waiter and user TID is 0. We are here because the
@ -1294,11 +1294,11 @@ static void mark_wake_futex(struct wake_q_head *wake_q, struct futex_q *q)
q->lock_ptr = NULL; q->lock_ptr = NULL;
} }
static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this, static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *top_waiter,
struct futex_hash_bucket *hb) struct futex_hash_bucket *hb)
{ {
struct task_struct *new_owner; struct task_struct *new_owner;
struct futex_pi_state *pi_state = this->pi_state; struct futex_pi_state *pi_state = top_waiter->pi_state;
u32 uninitialized_var(curval), newval; u32 uninitialized_var(curval), newval;
DEFINE_WAKE_Q(wake_q); DEFINE_WAKE_Q(wake_q);
bool deboost; bool deboost;
@ -1319,11 +1319,11 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this,
/* /*
* It is possible that the next waiter (the one that brought * It is possible that the next waiter (the one that brought
* this owner to the kernel) timed out and is no longer * top_waiter owner to the kernel) timed out and is no longer
* waiting on the lock. * waiting on the lock.
*/ */
if (!new_owner) if (!new_owner)
new_owner = this->task; new_owner = top_waiter->task;
/* /*
* We pass it to the next owner. The WAITERS bit is always * We pass it to the next owner. The WAITERS bit is always
@ -2633,7 +2633,7 @@ static int futex_unlock_pi(u32 __user *uaddr, unsigned int flags)
u32 uninitialized_var(curval), uval, vpid = task_pid_vnr(current); u32 uninitialized_var(curval), uval, vpid = task_pid_vnr(current);
union futex_key key = FUTEX_KEY_INIT; union futex_key key = FUTEX_KEY_INIT;
struct futex_hash_bucket *hb; struct futex_hash_bucket *hb;
struct futex_q *match; struct futex_q *top_waiter;
int ret; int ret;
retry: retry:
@ -2657,9 +2657,9 @@ retry:
* all and we at least want to know if user space fiddled * all and we at least want to know if user space fiddled
* with the futex value instead of blindly unlocking. * with the futex value instead of blindly unlocking.
*/ */
match = futex_top_waiter(hb, &key); top_waiter = futex_top_waiter(hb, &key);
if (match) { if (top_waiter) {
ret = wake_futex_pi(uaddr, uval, match, hb); ret = wake_futex_pi(uaddr, uval, top_waiter, hb);
/* /*
* In case of success wake_futex_pi dropped the hash * In case of success wake_futex_pi dropped the hash
* bucket lock. * bucket lock.