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pids: introduce find_get_task_by_vpid() helper

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There are several functions that do find_task_by_vpid() followed by
get_task_struct().  We can use a helper function instead.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mike Rapoport 2018-02-06 15:40:17 -08:00 • committed by Linus Torvalds
commit 2ee0826085
8 changed files with 33 additions and 68 deletions
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13
arch/ia64/kernel/perfmon.c
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@ -2610,17 +2610,10 @@ pfm_get_task(pfm_context_t *ctx, pid_t pid, struct task_struct **task)
if (pid < 2) return -EPERM;
if (pid != task_pid_vnr(current)) {
read_lock(&tasklist_lock);
p = find_task_by_vpid(pid);
/* make sure task cannot go away while we operate on it */
if (p) get_task_struct(p);
read_unlock(&tasklist_lock);
if (p == NULL) return -ESRCH;
p = find_get_task_by_vpid(pid);
if (!p)
return -ESRCH;
}
ret = pfm_task_incompatible(ctx, p);