forked from rrcarlosr/Jetpack
90 lines
3.1 KiB
Diff
90 lines
3.1 KiB
Diff
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From 4388d2973590b5d0414980309356e2451c5d4c2d Mon Sep 17 00:00:00 2001
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From: Peter Zijlstra <peterz@infradead.org>
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Date: Wed, 22 Mar 2017 11:35:56 +0100
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Subject: [PATCH 013/352] futex,rt_mutex: Introduce rt_mutex_init_waiter()
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Upstream commit 50809358dd7199aa7ce232f6877dd09ec30ef374
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Since there's already two copies of this code, introduce a helper now
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before adding a third one.
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Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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Cc: juri.lelli@arm.com
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Cc: bigeasy@linutronix.de
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Cc: xlpang@redhat.com
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Cc: rostedt@goodmis.org
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Cc: mathieu.desnoyers@efficios.com
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Cc: jdesfossez@efficios.com
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Cc: dvhart@infradead.org
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Cc: bristot@redhat.com
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Link: http://lkml.kernel.org/r/20170322104151.950039479@infradead.org
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/futex.c | 5 +----
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kernel/locking/rtmutex.c | 12 +++++++++---
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kernel/locking/rtmutex_common.h | 1 +
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3 files changed, 11 insertions(+), 7 deletions(-)
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diff --git a/kernel/futex.c b/kernel/futex.c
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index 802a2a0..600f7c3 100644
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--- a/kernel/futex.c
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+++ b/kernel/futex.c
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@@ -3005,10 +3005,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
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* The waiter is allocated on our stack, manipulated by the requeue
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* code while we sleep on uaddr.
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*/
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- debug_rt_mutex_init_waiter(&rt_waiter);
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- RB_CLEAR_NODE(&rt_waiter.pi_tree_entry);
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- RB_CLEAR_NODE(&rt_waiter.tree_entry);
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- rt_waiter.task = NULL;
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+ rt_mutex_init_waiter(&rt_waiter);
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ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE);
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if (unlikely(ret != 0))
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diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
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index c0639b5..d7dbce1 100644
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--- a/kernel/locking/rtmutex.c
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+++ b/kernel/locking/rtmutex.c
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@@ -1176,6 +1176,14 @@ void rt_mutex_adjust_pi(struct task_struct *task)
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next_lock, NULL, task);
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}
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+void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
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+{
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+ debug_rt_mutex_init_waiter(waiter);
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+ RB_CLEAR_NODE(&waiter->pi_tree_entry);
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+ RB_CLEAR_NODE(&waiter->tree_entry);
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+ waiter->task = NULL;
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+}
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+
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/**
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* __rt_mutex_slowlock() - Perform the wait-wake-try-to-take loop
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* @lock: the rt_mutex to take
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@@ -1258,9 +1266,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
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unsigned long flags;
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int ret = 0;
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- debug_rt_mutex_init_waiter(&waiter);
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- RB_CLEAR_NODE(&waiter.pi_tree_entry);
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- RB_CLEAR_NODE(&waiter.tree_entry);
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+ rt_mutex_init_waiter(&waiter);
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/*
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* Technically we could use raw_spin_[un]lock_irq() here, but this can
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diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
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index d4d98c9..74b4cf2f 100644
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--- a/kernel/locking/rtmutex_common.h
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+++ b/kernel/locking/rtmutex_common.h
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@@ -104,6 +104,7 @@ extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
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struct task_struct *proxy_owner);
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extern void rt_mutex_proxy_unlock(struct rt_mutex *lock,
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struct task_struct *proxy_owner);
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+extern void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter);
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extern int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
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struct rt_mutex_waiter *waiter,
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struct task_struct *task);
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--
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2.7.4
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