wait_task_inactive: "improve" the returned value for ->nvcsw == 0

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wait_task_inactive() returns 1 when p->nvcsw == 0 || p->nvcsw == 1.  This
means that two subsequent calls can return the same number while the task
was scheduled in between.

Change the code to return "nvcsw | LONG_MIN" instead of "nvcsw ?: 1", now
the overlap always needs LONG_MAX schedules.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Oleg Nesterov 2008-08-20 16:54:44 -07:00 • committed by Ingo Molnar

parent f31e11d87a

commit 93dcf55f82

1 changed files with 1 additions and 1 deletions

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kernel/sched.c

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