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Merge branch 'work.poll2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull more poll annotation updates from Al Viro:
 "This is preparation to solving the problems you've mentioned in the
  original poll series.

  After this series, the kernel is ready for running

      for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
            L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
            for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
      done

  as a for bulk search-and-replace.

  After that, the kernel is ready to apply the patch to unify
  {de,}mangle_poll(), and then get rid of kernel-side POLL... uses
  entirely, and we should be all done with that stuff.

  Basically, that's what you suggested wrt KPOLL..., except that we can
  use EPOLL... instead - they already are arch-independent (and equal to
  what is currently kernel-side POLL...).

  After the preparations (in this series) switch to returning EPOLL...
  from ->poll() instances is completely mechanical and kernel-side
  POLL... can go away. The last step (killing kernel-side POLL... and
  unifying {de,}mangle_poll() has to be done after the
  search-and-replace job, since we need userland-side POLL... for
  unified {de,}mangle_poll(), thus the cherry-pick at the last step.

  After that we will have:

   - POLL{IN,OUT,...} *not* in __poll_t, so any stray instances of
     ->poll() still using those will be caught by sparse.

   - eventpoll.c and select.c warning-free wrt __poll_t

   - no more kernel-side definitions of POLL... - userland ones are
     visible through the entire kernel (and used pretty much only for
     mangle/demangle)

   - same behavior as after the first series (i.e. sparc et.al. epoll(2)
     working correctly)"

* 'work.poll2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  annotate ep_scan_ready_list()
  ep_send_events_proc(): return result via esed->res
  preparation to switching ->poll() to returning EPOLL...
  add EPOLLNVAL, annotate EPOLL... and event_poll->event
  use linux/poll.h instead of asm/poll.h
  xen: fix poll misannotation
  smc: missing poll annotations
This commit is contained in:
Linus Torvalds 2018-02-11 13:57:19 -08:00
commit ee5daa1361
8 changed files with 47 additions and 40 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/xen/pvcalls-front.h
View file

@ -20,7 +20,7 @@ int pvcalls_front_recvmsg(struct socket *sock,
struct msghdr *msg,
size_t len,
int flags);
unsigned int pvcalls_front_poll(struct file *file,
__poll_t pvcalls_front_poll(struct file *file,
struct socket *sock,
poll_table *wait);
int pvcalls_front_release(struct socket *sock);

2
fs/coda/psdev.c
View file

@ -39,7 +39,7 @@
#include <linux/device.h>
#include <linux/pid_namespace.h>
#include <asm/io.h>
#include <asm/poll.h>
#include <linux/poll.h>
#include <linux/uaccess.h>
#include <linux/coda.h>

2
fs/debugfs/file.c
View file

@ -18,7 +18,7 @@
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/device.h>
#include <asm/poll.h>
#include <linux/poll.h>
#include "internal.h"

41
fs/eventpoll.c
View file

@ -260,6 +260,7 @@ struct ep_pqueue {
struct ep_send_events_data {
int maxevents;
struct epoll_event __user *events;
int res;
};
/*
@ -660,12 +661,13 @@ static inline void ep_pm_stay_awake_rcu(struct epitem *epi)
*
* Returns: The same integer error code returned by the @sproc callback.
*/
static int ep_scan_ready_list(struct eventpoll *ep,
int (*sproc)(struct eventpoll *,
static __poll_t ep_scan_ready_list(struct eventpoll *ep,
__poll_t (*sproc)(struct eventpoll *,
struct list_head *, void *),
void *priv, int depth, bool ep_locked)
{
int error, pwake = 0;
__poll_t res;
int pwake = 0;
unsigned long flags;
struct epitem *epi, *nepi;
LIST_HEAD(txlist);
@ -694,7 +696,7 @@ static int ep_scan_ready_list(struct eventpoll *ep,
/*
* Now call the callback function.
*/
error = (*sproc)(ep, &txlist, priv);
res = (*sproc)(ep, &txlist, priv);
spin_lock_irqsave(&ep->lock, flags);
/*
@ -747,7 +749,7 @@ static int ep_scan_ready_list(struct eventpoll *ep,
if (pwake)
ep_poll_safewake(&ep->poll_wait);
return error;
return res;
}
static void epi_rcu_free(struct rcu_head *head)
@ -864,7 +866,7 @@ static int ep_eventpoll_release(struct inode *inode, struct file *file)
return 0;
}
static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
static __poll_t 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);
@ -874,7 +876,7 @@ static void ep_ptable_queue_proc(struct file *file, wait_queue_head_t *whead,
* 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(const struct epitem *epi, poll_table *pt,
static __poll_t ep_item_poll(const struct epitem *epi, poll_table *pt,
int depth)
{
struct eventpoll *ep;
@ -894,7 +896,7 @@ static unsigned int ep_item_poll(const struct epitem *epi, poll_table *pt,
locked) & epi->event.events;
}
static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
static __poll_t ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv)
{
struct epitem *epi, *tmp;
@ -1414,7 +1416,8 @@ static noinline void ep_destroy_wakeup_source(struct epitem *epi)
static int ep_insert(struct eventpoll *ep, const struct epoll_event *event,
struct file *tfile, int fd, int full_check)
{
int error, revents, pwake = 0;
int error, pwake = 0;
__poll_t revents;
unsigned long flags;
long user_watches;
struct epitem *epi;
@ -1612,12 +1615,11 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi,
return 0;
}
static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
static __poll_t ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv)
{
struct ep_send_events_data *esed = priv;
int eventcnt;
unsigned int revents;
__poll_t revents;
struct epitem *epi;
struct epoll_event __user *uevent;
struct wakeup_source *ws;
@ -1630,8 +1632,8 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
* Items cannot vanish during the loop because ep_scan_ready_list() is
* holding "mtx" during this call.
*/
for (eventcnt = 0, uevent = esed->events;
!list_empty(head) && eventcnt < esed->maxevents;) {
for (esed->res = 0, uevent = esed->events;
!list_empty(head) && esed->res < esed->maxevents;) {
epi = list_first_entry(head, struct epitem, rdllink);
/*
@ -1665,9 +1667,11 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
__put_user(epi->event.data, &uevent->data)) {
list_add(&epi->rdllink, head);
ep_pm_stay_awake(epi);
return eventcnt ? eventcnt : -EFAULT;
if (!esed->res)
esed->res = -EFAULT;
return 0;
}
eventcnt++;
esed->res++;
uevent++;
if (epi->event.events & EPOLLONESHOT)
epi->event.events &= EP_PRIVATE_BITS;
@ -1689,7 +1693,7 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
}
}
return eventcnt;
return 0;
}
static int ep_send_events(struct eventpoll *ep,
@ -1700,7 +1704,8 @@ static int ep_send_events(struct eventpoll *ep,
esed.maxevents = maxevents;
esed.events = events;
return ep_scan_ready_list(ep, ep_send_events_proc, &esed, 0, false);
ep_scan_ready_list(ep, ep_send_events_proc, &esed, 0, false);
return esed.res;
}
static inline struct timespec64 ep_set_mstimeout(long ms)

2
fs/fcntl.c
View file

@ -26,7 +26,7 @@
#include <linux/shmem_fs.h>
#include <linux/compat.h>
#include <asm/poll.h>
#include <linux/poll.h>
#include <asm/siginfo.h>
#include <linux/uaccess.h>

3
include/linux/poll.h
View file

@ -11,6 +11,7 @@
#include <linux/sysctl.h>
#include <linux/uaccess.h>
#include <uapi/linux/poll.h>
#include <uapi/linux/eventpoll.h>
extern struct ctl_table epoll_table[]; /* for sysctl */
/* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
@ -22,7 +23,7 @@ extern struct ctl_table epoll_table[]; /* for sysctl */
#define WQUEUES_STACK_ALLOC (MAX_STACK_ALLOC - FRONTEND_STACK_ALLOC)
#define N_INLINE_POLL_ENTRIES (WQUEUES_STACK_ALLOC / sizeof(struct poll_table_entry))
#define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
#define DEFAULT_POLLMASK (EPOLLIN | EPOLLOUT | EPOLLRDNORM | EPOLLWRNORM)
struct poll_table_struct;

33
include/uapi/linux/eventpoll.h
View file

@ -28,20 +28,21 @@
#define EPOLL_CTL_MOD 3
/* Epoll event masks */
#define EPOLLIN 0x00000001
#define EPOLLPRI 0x00000002
#define EPOLLOUT 0x00000004
#define EPOLLERR 0x00000008
#define EPOLLHUP 0x00000010
#define EPOLLRDNORM 0x00000040
#define EPOLLRDBAND 0x00000080
#define EPOLLWRNORM 0x00000100
#define EPOLLWRBAND 0x00000200
#define EPOLLMSG 0x00000400
#define EPOLLRDHUP 0x00002000
#define EPOLLIN (__force __poll_t)0x00000001
#define EPOLLPRI (__force __poll_t)0x00000002
#define EPOLLOUT (__force __poll_t)0x00000004
#define EPOLLERR (__force __poll_t)0x00000008
#define EPOLLHUP (__force __poll_t)0x00000010
#define EPOLLNVAL (__force __poll_t)0x00000020
#define EPOLLRDNORM (__force __poll_t)0x00000040
#define EPOLLRDBAND (__force __poll_t)0x00000080
#define EPOLLWRNORM (__force __poll_t)0x00000100
#define EPOLLWRBAND (__force __poll_t)0x00000200
#define EPOLLMSG (__force __poll_t)0x00000400
#define EPOLLRDHUP (__force __poll_t)0x00002000
/* Set exclusive wakeup mode for the target file descriptor */
#define EPOLLEXCLUSIVE (1U << 28)
#define EPOLLEXCLUSIVE (__force __poll_t)(1U << 28)
/*
* Request the handling of system wakeup events so as to prevent system suspends
@ -53,13 +54,13 @@
*
* Requires CAP_BLOCK_SUSPEND
*/
#define EPOLLWAKEUP (1U << 29)
#define EPOLLWAKEUP (__force __poll_t)(1U << 29)
/* Set the One Shot behaviour for the target file descriptor */
#define EPOLLONESHOT (1U << 30)
#define EPOLLONESHOT (__force __poll_t)(1U << 30)
/* Set the Edge Triggered behaviour for the target file descriptor */
#define EPOLLET (1U << 31)
#define EPOLLET (__force __poll_t)(1U << 31)
/*
* On x86-64 make the 64bit structure have the same alignment as the
@ -74,7 +75,7 @@
#endif
struct epoll_event {
__u32 events;
__poll_t events;
__u64 data;
} EPOLL_PACKED;

2
net/smc/af_smc.c
View file

@ -1141,7 +1141,7 @@ static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
static __poll_t smc_accept_poll(struct sock *parent)
{
struct smc_sock *isk = smc_sk(parent);
int mask = 0;
__poll_t mask = 0;
spin_lock(&isk->accept_q_lock);
if (!list_empty(&isk->accept_q))