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| author | Prakash Sangappa <prakash.sangappa@oracle.com> | 2022-05-09 18:29:20 -0700 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-05-09 18:29:20 -0700 |
| commit | 49c9dd0df65d547a58642d2f717eeb560e1db140 (patch) | |
| tree | be0dd5509e678797c2c6aa07ff5acffc15b52a44 | |
| parent | 0e900029655327bb5326ced02eff97667a079039 (diff) | |
| download | lwn-49c9dd0df65d547a58642d2f717eeb560e1db140.tar.gz lwn-49c9dd0df65d547a58642d2f717eeb560e1db140.zip | |
ipc: update semtimedop() to use hrtimer
semtimedop() should be converted to use hrtimer like it has been done for
most of the system calls with timeouts. This system call already takes a
struct timespec as an argument and can therefore provide finer granularity
timed wait.
Link: https://lkml.kernel.org/r/1651187881-2858-1-git-send-email-prakash.sangappa@oracle.com
Signed-off-by: Prakash Sangappa <prakash.sangappa@oracle.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | ipc/sem.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index 38ef91a63edd..c8496f98b139 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -1993,7 +1993,9 @@ long __do_semtimedop(int semid, struct sembuf *sops, int max, locknum; bool undos = false, alter = false, dupsop = false; struct sem_queue queue; - unsigned long dup = 0, jiffies_left = 0; + unsigned long dup = 0; + ktime_t expires, *exp = NULL; + bool timed_out = false; if (nsops < 1 || semid < 0) return -EINVAL; @@ -2001,12 +2003,11 @@ long __do_semtimedop(int semid, struct sembuf *sops, return -E2BIG; if (timeout) { - if (timeout->tv_sec < 0 || timeout->tv_nsec < 0 || - timeout->tv_nsec >= 1000000000L) { - error = -EINVAL; - goto out; - } - jiffies_left = timespec64_to_jiffies(timeout); + if (!timespec64_valid(timeout)) + return -EINVAL; + expires = ktime_add_safe(ktime_get(), + timespec64_to_ktime(*timeout)); + exp = &expires; } @@ -2164,10 +2165,8 @@ long __do_semtimedop(int semid, struct sembuf *sops, sem_unlock(sma, locknum); rcu_read_unlock(); - if (timeout) - jiffies_left = schedule_timeout(jiffies_left); - else - schedule(); + timed_out = !schedule_hrtimeout_range(exp, + current->timer_slack_ns, HRTIMER_MODE_ABS); /* * fastpath: the semop has completed, either successfully or @@ -2208,7 +2207,7 @@ long __do_semtimedop(int semid, struct sembuf *sops, /* * If an interrupt occurred we have to clean up the queue. */ - if (timeout && jiffies_left == 0) + if (timed_out) error = -EAGAIN; } while (error == -EINTR && !signal_pending(current)); /* spurious */ |