Re: [PATCH] ipc/sem.c: fix update sem_otime when calling sem_op insemaphore initialization

From: Manfred Spraul
Date: Wed Sep 25 2013 - 02:55:27 EST

Hi Jia,

On 09/25/2013 05:05 AM, Jia He wrote:
Hi Manfred
IIUC after reivewing your patch and src code, does it seem
sem_otime lost the chance to be updated when calling
In old codes, even whendo_smart_update(sma, NULL, 0, 0, &tasks),
the otime can be updated after several conditions checking.
The update is performed now performed inside perform_atomic_semop():

Old code:
perform_atomic_semop() does not update sem_otime. It just returns 0 for successfull operations.
This "0 returned" is passed upwards ("semop_completed") into do_smart_update()
do_smart_update() updates sem_otime.

New code:
perform_atomic_semop() updates sem_otime immediately (your change).
No need to keep track if a waiting operation was completed (my change).

I don't see a problem - perhaps I overlook something.
Which problem do you see?


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