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lift the calls of ep_read_events_proc() into the callers 

Expand the calls of ep_scan_ready_list() that get ep_read_events_proc().
As a side benefit we can pass depth to ep_read_events_proc() by value
and not by address - the latter used to be forced by the signature
expected from ep_scan_ready_list() callback.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-08-31 13:16:39 -04:00
parent db502f8a3b
commit 1ec09974d8
1 changed files with 14 additions and 10 deletions
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24
fs/eventpoll.c
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@ -774,7 +774,7 @@ static int ep_eventpoll_release(struct inode *inode, struct file *file)
}
static __poll_t ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv);
int depth);
static void ep_ptable_queue_proc(struct file *file, wait_queue_head_t *whead,
poll_table *pt);
@ -787,6 +787,8 @@ static __poll_t ep_item_poll(const struct epitem *epi, poll_table *pt,
int depth)
{
struct eventpoll *ep;
LIST_HEAD(txlist);
__poll_t res;
bool locked;
pt->_key = epi->event.events;
@ -797,20 +799,19 @@ static __poll_t ep_item_poll(const struct epitem *epi, poll_table *pt,
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;
ep_start_scan(ep, depth, locked, &txlist);
res = ep_read_events_proc(ep, &txlist, depth + 1);
ep_done_scan(ep, depth, locked, &txlist);
return res & epi->event.events;
}
static __poll_t ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv)
int depth)
{
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, depth)) {
@ -832,7 +833,8 @@ static __poll_t ep_read_events_proc(struct eventpoll *ep, struct list_head *head
static __poll_t ep_eventpoll_poll(struct file *file, poll_table *wait)
{
struct eventpoll *ep = file->private_data;
int depth = 0;
LIST_HEAD(txlist);
__poll_t res;
/* Insert inside our poll wait queue */
poll_wait(file, &ep->poll_wait, wait);
@ -841,8 +843,10 @@ static __poll_t ep_eventpoll_poll(struct file *file, poll_table *wait)
* Proceed to find out if wanted events are really available inside
* the ready list.
*/
return ep_scan_ready_list(ep, ep_read_events_proc,
&depth, depth, false);
ep_start_scan(ep, 0, false, &txlist);
res = ep_read_events_proc(ep, &txlist, 1);
ep_done_scan(ep, 0, false, &txlist);
return res;
}
#ifdef CONFIG_PROC_FS