diff options
| author | Luca Coelho <luciano.coelho@intel.com> | 2016-05-10 10:30:56 +0300 |
|---|---|---|
| committer | Luca Coelho <luciano.coelho@intel.com> | 2016-05-10 10:30:56 +0300 |
| commit | bae6692c24236d0203f88a444986d86437a858fa (patch) | |
| tree | 0f9bee1250af3046fa46049736b615b81e60f56e /ipc/sem.c | |
| parent | 46167a8fd4248533ad15867e6988ff20e76de641 (diff) | |
| parent | 57fbcce37be7c1d2622b56587c10ade00e96afa3 (diff) | |
Merge tag 'mac80211-next-for-davem-2016-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next into master
To synchronize with Kalle, here's just a big change that affects
all drivers - removing the duplicated enum ieee80211_band and
replacing it by enum nl80211_band. On top of that, just a small
documentation update.
Diffstat (limited to 'ipc/sem.c')
| -rw-r--r-- | ipc/sem.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index cddd5b5fde51..b3757ea0694b 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -92,7 +92,14 @@ /* One semaphore structure for each semaphore in the system. */ struct sem { int semval; /* current value */ - int sempid; /* pid of last operation */ + /* + * PID of the process that last modified the semaphore. For + * Linux, specifically these are: + * - semop + * - semctl, via SETVAL and SETALL. + * - at task exit when performing undo adjustments (see exit_sem). + */ + int sempid; spinlock_t lock; /* spinlock for fine-grained semtimedop */ struct list_head pending_alter; /* pending single-sop operations */ /* that alter the semaphore */ @@ -1444,8 +1451,10 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum, goto out_unlock; } - for (i = 0; i < nsems; i++) + for (i = 0; i < nsems; i++) { sma->sem_base[i].semval = sem_io[i]; + sma->sem_base[i].sempid = task_tgid_vnr(current); + } ipc_assert_locked_object(&sma->sem_perm); list_for_each_entry(un, &sma->list_id, list_id) { |