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net: convert lls to use time_in_range()

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Time in range will fail safely if we move to a different cpu with an
extremely large clock skew.
Add time_in_range64() and convert lls to use it.

changelog:
v2
- fixed double call to sched_clock in can_poll_ll
- fixed checkpatchisms

Signed-off-by: Eliezer Tamir <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eliezer Tamir 2013-07-02 23:22:47 +03:00 • committed by David S. Miller
commit 1bc2774d86
3 changed files with 27 additions and 13 deletions
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10
fs/select.c
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@ -403,7 +403,8 @@ int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
int retval, i, timed_out = 0;
unsigned long slack = 0;
unsigned int ll_flag = ll_get_flag();
u64 ll_time = ll_end_time();
u64 ll_start = ll_start_time(ll_flag);
u64 ll_time = ll_run_time();
rcu_read_lock();
retval = max_select_fd(n, fds);
@ -498,7 +499,7 @@ int do_select(int n, fd_set_bits *fds, struct timespec *end_time)
}
/* only if on, have sockets with POLL_LL and not out of time */
if (ll_flag && can_ll && can_poll_ll(ll_time))
if (ll_flag && can_ll && can_poll_ll(ll_start, ll_time))
continue;
/*
@ -770,7 +771,8 @@ static int do_poll(unsigned int nfds, struct poll_list *list,
int timed_out = 0, count = 0;
unsigned long slack = 0;
unsigned int ll_flag = ll_get_flag();
u64 ll_time = ll_end_time();
u64 ll_start = ll_start_time(ll_flag);
u64 ll_time = ll_run_time();
/* Optimise the no-wait case */
if (end_time && !end_time->tv_sec && !end_time->tv_nsec) {
@ -819,7 +821,7 @@ static int do_poll(unsigned int nfds, struct poll_list *list,
break;
/* only if on, have sockets with POLL_LL and not out of time */
if (ll_flag && can_ll && can_poll_ll(ll_time))
if (ll_flag && can_ll && can_poll_ll(ll_start, ll_time))
continue;
/*