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percpu_ida: Make percpu_ida_alloc + callers accept task state bitmask

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This patch changes percpu_ida_alloc() + callers to accept task state
bitmask for prepare_to_wait() for code like target/iscsi that needs
it for interruptible sleep, that is provided in a subsequent patch.

It now expects TASK_UNINTERRUPTIBLE when the caller is able to sleep
waiting for a new tag, or TASK_RUNNING when the caller cannot sleep,
and is forced to return a negative value when no tags are available.

v2 changes:
  - Include blk-mq + tcm_fc + vhost/scsi + target/iscsi changes
  - Drop signal_pending_state() call
v3 changes:
  - Only call prepare_to_wait() + finish_wait() when != TASK_RUNNING
    (PeterZ)

Reported-by: Linus Torvalds <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Kent Overstreet <[email protected]>
Cc: <[email protected]> #3.12+
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Kent Overstreet 2014-01-19 08:26:37 +00:00 • committed by Nicholas Bellinger
commit 6f6b5d1ec5
6 changed files with 23 additions and 14 deletions
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2
drivers/vhost/scsi.c
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@ -728,7 +728,7 @@ vhost_scsi_get_tag(struct vhost_virtqueue *vq,
}
se_sess = tv_nexus->tvn_se_sess;
tag = percpu_ida_alloc(&se_sess->sess_tag_pool, GFP_ATOMIC);
tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
if (tag < 0) {
pr_err("Unable to obtain tag for tcm_vhost_cmd\n");
return ERR_PTR(-ENOMEM);