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Merge branch 'akpm' (patches from Andrew)

Browse source 
Merge more updates from Andrew Morton:

 - a bit more MM

 - procfs updates

 - dynamic-debug fixes

 - lib/ updates

 - checkpatch

 - epoll

 - nilfs2

 - signals

 - rapidio

 - PID management cleanup and optimization

 - kcov updates

 - sysvipc updates

 - quite a few misc things all over the place

* emailed patches from Andrew Morton <[email protected]>: (94 commits)
  EXPERT Kconfig menu: fix broken EXPERT menu
  include/asm-generic/topology.h: remove unused parent_node() macro
  arch/tile/include/asm/topology.h: remove unused parent_node() macro
  arch/sparc/include/asm/topology_64.h: remove unused parent_node() macro
  arch/sh/include/asm/topology.h: remove unused parent_node() macro
  arch/ia64/include/asm/topology.h: remove unused parent_node() macro
  drivers/pcmcia/sa1111_badge4.c: avoid unused function warning
  mm: add infrastructure for get_user_pages_fast() benchmarking
  sysvipc: make get_maxid O(1) again
  sysvipc: properly name ipc_addid() limit parameter
  sysvipc: duplicate lock comments wrt ipc_addid()
  sysvipc: unteach ids->next_id for !CHECKPOINT_RESTORE
  initramfs: use time64_t timestamps
  drivers/watchdog: make use of devm_register_reboot_notifier()
  kernel/reboot.c: add devm_register_reboot_notifier()
  kcov: update documentation
  Makefile: support flag -fsanitizer-coverage=trace-cmp
  kcov: support comparison operands collection
  kcov: remove pointless current != NULL check
  kernel/panic.c: add TAINT_AUX
  ...
This commit is contained in:
Linus Torvalds 2017-11-17 16:56:17 -08:00
commit fa7f578076
115 changed files with 1892 additions and 952 deletions
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137
fs/eventpoll.c
View file

@ -276,12 +276,6 @@ static DEFINE_MUTEX(epmutex);
/* Used to check for epoll file descriptor inclusion loops */
static struct nested_calls poll_loop_ncalls;
/* Used for safe wake up implementation */
static struct nested_calls poll_safewake_ncalls;
/* Used to call file's f_op->poll() under the nested calls boundaries */
static struct nested_calls poll_readywalk_ncalls;
/* Slab cache used to allocate "struct epitem" */
static struct kmem_cache *epi_cache __read_mostly;
@ -551,40 +545,21 @@ out_unlock:
* this special case of epoll.
*/
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static inline void ep_wake_up_nested(wait_queue_head_t *wqueue,
unsigned long events, int subclass)
{
unsigned long flags;
spin_lock_irqsave_nested(&wqueue->lock, flags, subclass);
wake_up_locked_poll(wqueue, events);
spin_unlock_irqrestore(&wqueue->lock, flags);
}
#else
static inline void ep_wake_up_nested(wait_queue_head_t *wqueue,
unsigned long events, int subclass)
{
wake_up_poll(wqueue, events);
}
#endif
static struct nested_calls poll_safewake_ncalls;
static int ep_poll_wakeup_proc(void *priv, void *cookie, int call_nests)
{
ep_wake_up_nested((wait_queue_head_t *) cookie, POLLIN,
1 + call_nests);
unsigned long flags;
wait_queue_head_t *wqueue = (wait_queue_head_t *)cookie;
spin_lock_irqsave_nested(&wqueue->lock, flags, call_nests + 1);
wake_up_locked_poll(wqueue, POLLIN);
spin_unlock_irqrestore(&wqueue->lock, flags);
return 0;
}
/*
* Perform a safe wake up of the poll wait list. The problem is that
* with the new callback'd wake up system, it is possible that the
* poll callback is reentered from inside the call to wake_up() done
* on the poll wait queue head. The rule is that we cannot reenter the
* wake up code from the same task more than EP_MAX_NESTS times,
* and we cannot reenter the same wait queue head at all. This will
* enable to have a hierarchy of epoll file descriptor of no more than
* EP_MAX_NESTS deep.
*/
static void ep_poll_safewake(wait_queue_head_t *wq)
{
int this_cpu = get_cpu();
@ -595,6 +570,15 @@ static void ep_poll_safewake(wait_queue_head_t *wq)
put_cpu();
}
#else
static void ep_poll_safewake(wait_queue_head_t *wq)
{
wake_up_poll(wq, POLLIN);
}
#endif
static void ep_remove_wait_queue(struct eppoll_entry *pwq)
{
wait_queue_head_t *whead;
@ -880,11 +864,33 @@ static int ep_eventpoll_release(struct inode *inode, struct file *file)
return 0;
}
static inline unsigned int ep_item_poll(struct epitem *epi, poll_table *pt)
{
pt->_key = epi->event.events;
static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv);
static void ep_ptable_queue_proc(struct file *file, wait_queue_head_t *whead,
poll_table *pt);
return epi->ffd.file->f_op->poll(epi->ffd.file, pt) & epi->event.events;
/*
* Differs from ep_eventpoll_poll() in that internal callers already have
* the ep->mtx so we need to start from depth=1, such that mutex_lock_nested()
* is correctly annotated.
*/
static unsigned int ep_item_poll(struct epitem *epi, poll_table *pt, int depth)
{
struct eventpoll *ep;
bool locked;
pt->_key = epi->event.events;
if (!is_file_epoll(epi->ffd.file))
return epi->ffd.file->f_op->poll(epi->ffd.file, pt) &
epi->event.events;
ep = epi->ffd.file->private_data;
poll_wait(epi->ffd.file, &ep->poll_wait, pt);
locked = pt && (pt->_qproc == ep_ptable_queue_proc);
return ep_scan_ready_list(epi->ffd.file->private_data,
ep_read_events_proc, &depth, depth,
locked) & epi->event.events;
}
static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
@ -892,13 +898,15 @@ static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
{
struct epitem *epi, *tmp;
poll_table pt;
int depth = *(int *)priv;
init_poll_funcptr(&pt, NULL);
depth++;
list_for_each_entry_safe(epi, tmp, head, rdllink) {
if (ep_item_poll(epi, &pt))
if (ep_item_poll(epi, &pt, depth)) {
return POLLIN | POLLRDNORM;
else {
} else {
/*
* Item has been dropped into the ready list by the poll
* callback, but it's not actually ready, as far as
@ -912,48 +920,20 @@ static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
return 0;
}
static void ep_ptable_queue_proc(struct file *file, wait_queue_head_t *whead,
poll_table *pt);
struct readyevents_arg {
struct eventpoll *ep;
bool locked;
};
static int ep_poll_readyevents_proc(void *priv, void *cookie, int call_nests)
{
struct readyevents_arg *arg = priv;
return ep_scan_ready_list(arg->ep, ep_read_events_proc, NULL,
call_nests + 1, arg->locked);
}
static unsigned int ep_eventpoll_poll(struct file *file, poll_table *wait)
{
int pollflags;
struct eventpoll *ep = file->private_data;
struct readyevents_arg arg;
/*
* During ep_insert() we already hold the ep->mtx for the tfile.
* Prevent re-aquisition.
*/
arg.locked = wait && (wait->_qproc == ep_ptable_queue_proc);
arg.ep = ep;
int depth = 0;
/* Insert inside our poll wait queue */
poll_wait(file, &ep->poll_wait, wait);
/*
* Proceed to find out if wanted events are really available inside
* the ready list. This need to be done under ep_call_nested()
* supervision, since the call to f_op->poll() done on listed files
* could re-enter here.
* the ready list.
*/
pollflags = ep_call_nested(&poll_readywalk_ncalls, EP_MAX_NESTS,
ep_poll_readyevents_proc, &arg, ep, current);
return pollflags != -1 ? pollflags : 0;
return ep_scan_ready_list(ep, ep_read_events_proc,
&depth, depth, false);
}
#ifdef CONFIG_PROC_FS
@ -1472,7 +1452,7 @@ static int ep_insert(struct eventpoll *ep, struct epoll_event *event,
* this operation completes, the poll callback can start hitting
* the new item.
*/
revents = ep_item_poll(epi, &epq.pt);
revents = ep_item_poll(epi, &epq.pt, 1);
/*
* We have to check if something went wrong during the poll wait queue
@ -1606,7 +1586,7 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi, struct epoll_even
* Get current event bits. We can safely use the file* here because
* its usage count has been increased by the caller of this function.
*/
revents = ep_item_poll(epi, &pt);
revents = ep_item_poll(epi, &pt, 1);
/*
* If the item is "hot" and it is not registered inside the ready
@ -1674,7 +1654,7 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
list_del_init(&epi->rdllink);
revents = ep_item_poll(epi, &pt);
revents = ep_item_poll(epi, &pt, 1);
/*
* If the event mask intersect the caller-requested one,
@ -2313,11 +2293,10 @@ static int __init eventpoll_init(void)
*/
ep_nested_calls_init(&poll_loop_ncalls);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/* Initialize the structure used to perform safe poll wait head wake ups */
ep_nested_calls_init(&poll_safewake_ncalls);
/* Initialize the structure used to perform file's f_op->poll() calls */
ep_nested_calls_init(&poll_readywalk_ncalls);
#endif
/*
* We can have many thousands of epitems, so prevent this from
@ -2327,11 +2306,11 @@ static int __init eventpoll_init(void)
/* Allocates slab cache used to allocate "struct epitem" items */
epi_cache = kmem_cache_create("eventpoll_epi", sizeof(struct epitem),
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, NULL);
/* Allocates slab cache used to allocate "struct eppoll_entry" */
pwq_cache = kmem_cache_create("eventpoll_pwq",
sizeof(struct eppoll_entry), 0, SLAB_PANIC, NULL);
sizeof(struct eppoll_entry), 0, SLAB_PANIC|SLAB_ACCOUNT, NULL);
return 0;
}