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Linux 5.13

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Merge tag 'v5.13' into android-mainline

Linux 5.13

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iead72999b7d11801452cc18508415ddf07291fa8
This commit is contained in:
Greg Kroah-Hartman 2021-06-28 08:57:52 +02:00
commit 7c4aaf7f0d
6 changed files with 3 additions and 62 deletions
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2
Makefile
View File

@ -2,7 +2,7 @@
VERSION = 5
PATCHLEVEL = 13
SUBLEVEL = 0
EXTRAVERSION = -rc7
EXTRAVERSION =
NAME = Opossums on Parade
# *DOCUMENTATION*

1
include/linux/sched.h
View File

@ -1002,7 +1002,6 @@ struct task_struct {
/* Signal handlers: */
struct signal_struct *signal;
struct sighand_struct __rcu *sighand;
struct sigqueue *sigqueue_cache;
sigset_t blocked;
sigset_t real_blocked;
/* Restored if set_restore_sigmask() was used: */

1
include/linux/signal.h
View File

@ -267,7 +267,6 @@ static inline void init_sigpending(struct sigpending *sig)
}
extern void flush_sigqueue(struct sigpending *queue);
extern void exit_task_sigqueue_cache(struct task_struct *tsk);
/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
static inline int valid_signal(unsigned long sig)

1
kernel/exit.c
View File

@ -162,7 +162,6 @@ static void __exit_signal(struct task_struct *tsk)
flush_sigqueue(&sig->shared_pending);
tty_kref_put(tty);
}
exit_task_sigqueue_cache(tsk);
}
static void delayed_put_task_struct(struct rcu_head *rhp)

1
kernel/fork.c
View File

@ -2013,7 +2013,6 @@ static __latent_entropy struct task_struct *copy_process(
spin_lock_init(&p->alloc_lock);
init_sigpending(&p->pending);
p->sigqueue_cache = NULL;
p->utime = p->stime = p->gtime = 0;
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME

59
kernel/signal.c
View File

@ -431,22 +431,7 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t gfp_flags,
rcu_read_unlock();
if (override_rlimit || likely(sigpending <= task_rlimit(t, RLIMIT_SIGPENDING))) {
/*
* Preallocation does not hold sighand::siglock so it can't
* use the cache. The lockless caching requires that only
* one consumer and only one producer run at a time.
*
* For the regular allocation case it is sufficient to
* check @q for NULL because this code can only be called
* if the target task @t has not been reaped yet; which
* means this code can never observe the error pointer which is
* written to @t->sigqueue_cache in exit_task_sigqueue_cache().
*/
q = READ_ONCE(t->sigqueue_cache);
if (!q || sigqueue_flags)
q = kmem_cache_alloc(sigqueue_cachep, gfp_flags);
else
WRITE_ONCE(t->sigqueue_cache, NULL);
q = kmem_cache_alloc(sigqueue_cachep, gfp_flags);
} else {
print_dropped_signal(sig);
}
@ -463,53 +448,13 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t gfp_flags,
return q;
}
void exit_task_sigqueue_cache(struct task_struct *tsk)
{
/* Race free because @tsk is mopped up */
struct sigqueue *q = tsk->sigqueue_cache;
if (q) {
/*
* Hand it back to the cache as the task might
* be self reaping which would leak the object.
*/
kmem_cache_free(sigqueue_cachep, q);
}
/*
* Set an error pointer to ensure that @tsk will not cache a
* sigqueue when it is reaping it's child tasks
*/
tsk->sigqueue_cache = ERR_PTR(-1);
}
static void sigqueue_cache_or_free(struct sigqueue *q)
{
/*
* Cache one sigqueue per task. This pairs with the consumer side
* in __sigqueue_alloc() and needs READ/WRITE_ONCE() to prevent the
* compiler from store tearing and to tell KCSAN that the data race
* is intentional when run without holding current->sighand->siglock,
* which is fine as current obviously cannot run __sigqueue_free()
* concurrently.
*
* The NULL check is safe even if current has been reaped already,
* in which case exit_task_sigqueue_cache() wrote an error pointer
* into current->sigqueue_cache.
*/
if (!READ_ONCE(current->sigqueue_cache))
WRITE_ONCE(current->sigqueue_cache, q);
else
kmem_cache_free(sigqueue_cachep, q);
}
static void __sigqueue_free(struct sigqueue *q)
{
if (q->flags & SIGQUEUE_PREALLOC)
return;
if (atomic_dec_and_test(&q->user->sigpending))
free_uid(q->user);
sigqueue_cache_or_free(q);
kmem_cache_free(sigqueue_cachep, q);
}
void flush_sigqueue(struct sigpending *queue)