shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-06 19:08:57 +09:00
Code Issues Packages Projects Releases Wiki Activity

futex: Cleanup variable names for futex_top_waiter()

Browse Source 
From: Peter Zijlstra <peterz@infradead.org>

commit 499f5aca2c upstream.

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>
[bwh: Backported to 4.9: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Hutchings
2021-03-01 18:30:39 +01:00
committed by Chris
parent 9e8b7099be
commit 69a3661e28
1 changed files with 14 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
kernel/futex.c
View File

@@ -1352,14 +1352,14 @@ static int lookup_pi_state(u32 __user *uaddr, u32 uval,
union futex_key *key, struct futex_pi_state **ps,
struct task_struct **exiting)
{
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
* attach to the pi_state when the validation succeeds.
*/
if (match)
return attach_to_pi_state(uaddr, uval, match->pi_state, ps);
if (top_waiter)
return attach_to_pi_state(uaddr, uval, top_waiter->pi_state, ps);
/*
* We are the first waiter - try to look up the owner based on
@@ -1414,7 +1414,7 @@ static int futex_lock_pi_atomic(u32 __user *uaddr, struct futex_hash_bucket *hb,
int set_waiters)
{
u32 uval, newval, vpid = task_pid_vnr(task);
struct futex_q *match;
struct futex_q *top_waiter;
int ret;
/*
@@ -1440,9 +1440,9 @@ 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
* its pi_state.
*/
match = futex_top_waiter(hb, key);
if (match)
return attach_to_pi_state(uaddr, uval, match->pi_state, ps);
top_waiter = futex_top_waiter(hb, key);
if (top_waiter)
return attach_to_pi_state(uaddr, uval, top_waiter->pi_state, ps);
/*
* No waiter and user TID is 0. We are here because the
@@ -1532,11 +1532,11 @@ static void mark_wake_futex(struct wake_q_head *wake_q, struct futex_q *q)
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 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;
WAKE_Q(wake_q);
bool deboost;
@@ -1557,7 +1557,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this,
/*
* When we interleave with futex_lock_pi() where it does
* rt_mutex_timed_futex_lock(), we might observe @this futex_q waiter,
* rt_mutex_timed_futex_lock(), we might observe @top_waiter futex_q waiter,
* but the rt_mutex's wait_list can be empty (either still, or again,
* depending on which side we land).
*
@@ -2975,7 +2975,7 @@ static int futex_unlock_pi(u32 __user *uaddr, unsigned int flags)
u32 uninitialized_var(curval), uval, vpid = task_pid_vnr(current);
union futex_key key = FUTEX_KEY_INIT;
struct futex_hash_bucket *hb;
struct futex_q *match;
struct futex_q *top_waiter;
int ret;
retry:
@@ -2999,9 +2999,9 @@ retry:
* all and we at least want to know if user space fiddled
* with the futex value instead of blindly unlocking.
*/
match = futex_top_waiter(hb, &key);
if (match) {
ret = wake_futex_pi(uaddr, uval, match, hb);
top_waiter = futex_top_waiter(hb, &key);
if (top_waiter) {
ret = wake_futex_pi(uaddr, uval, top_waiter, hb);
/*
* In case of success wake_futex_pi dropped the hash
* bucket lock.