[PATCH RFC v3 2/7] epoll: Specify clockid explicitly

Fam Zheng
2015-02-13T09:05:52Z

Later we will add clockid in the interface, so let's start using explicit
clockid internally. Now we specify CLOCK_MONOTONIC, which is the same as before.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
fs/eventpoll.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 4cf359d..5840b03 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1570,7 +1570,7 @@ static int ep_send_events(struct eventpoll *ep,
* error code, in case of error.
*/
static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
- int maxevents, const ktime_t timeout)
+ int maxevents, int clockid, const ktime_t timeout)
{
int res = 0, eavail, timed_out = 0;
unsigned long flags;
@@ -1578,6 +1578,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
wait_queue_t wait;
ktime_t expires, *to = NULL;

+ if (clockid != CLOCK_MONOTONIC && clockid != CLOCK_REALTIME)
+ return -EINVAL;
if (!ktime_to_ns(timeout)) {
/*
* Avoid the unnecessary trip to the wait queue loop, if the
@@ -1624,7 +1626,8 @@ fetch_events:
}

spin_unlock_irqrestore(&ep->lock, flags);
- if (!schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS))
+ if (!schedule_hrtimeout_range_clock(to, slack,
+ HRTIMER_MODE_ABS, clockid))
timed_out = 1;

spin_lock_irqsave(&ep->lock, flags);
@@ -1945,7 +1948,8 @@ error_return:
}

static inline int epoll_wait_do(int epfd, struct epoll_event __user *events,
- int maxevents, const ktime_t timeout)
+ int maxevents, int clockid,
+ const ktime_t timeout)
{
int error;
struct fd f;
@@ -1979,7 +1983,7 @@ static inline int epoll_wait_do(int epfd, struct epoll_event __user *events,
ep = f.file->private_data;

/* Time to fish for events ... */
- error = ep_poll(ep, events, maxevents, timeout);
+ error = ep_poll(ep, events, maxevents, clockid, timeout);

error_fput:
fdput(f);
@@ -1994,12 +1998,13 @@ SYSCALL_DEFINE4(epoll_wait, int, epfd, struct epoll_event __user *, events,
int, maxevents, int, timeout)
{
ktime_t kt = ms_to_ktime(timeout);
- return epoll_wait_do(epfd, events, maxevents, kt);
+ return epoll_wait_do(epfd, events, maxevents, CLOCK_MONOTONIC, kt);
}

static inline int epoll_pwait_do(int epfd, struct epoll_event __user *events,
- int maxevents, ktime_t timeout,
- sigset_t *sigmask, size_t sigsetsize)
+ int maxevents,
+ int clockid, ktime_t timeout,
+ sigset_t *sigmask)
{
int error;
sigset_t sigsaved;
@@ -2013,7 +2018,7 @@ static inline int epoll_pwait_do(int epfd, struct epoll_event __user *events,
set_current_blocked(sigmask);
}

- error = epoll_wait_do(epfd, events, maxevents, timeout);
+ error = epoll_wait_do(epfd, events, maxevents, clockid, timeout);

/*
* If we changed the signal mask, we need to restore the original one.
@@ -2050,8 +2055,8 @@ SYSCALL_DEFINE6(epoll_pwait, int, epfd, struct epoll_event __user *, events,
if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
return -EFAULT;
}
- return epoll_pwait_do(epfd, events, maxevents, kt,
- sigmask ? &ksigmask : NULL, sigsetsize);
+ return epoll_pwait_do(epfd, events, maxevents, CLOCK_MONOTONIC, kt,
+ sigmask ? &ksigmask : NULL);
}

#ifdef CONFIG_COMPAT
@@ -2073,8 +2078,8 @@ COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
sigset_from_compat(&ksigmask, &csigmask);
}

- return epoll_pwait_do(epfd, events, maxevents, kt,
- sigmask ? &ksigmask : NULL, sigsetsize);
+ return epoll_pwait_do(epfd, events, maxevents, CLOCK_MONOTONIC, kt,
+ sigmask ? &ksigmask : NULL);
}
#endif

--
1.9.3