Re: [Patch] shm bug introduced with pagecache in 2.3.11

Alan Cox (alan@lxorguk.ukuu.org.uk)
Sat, 20 Nov 1999 15:04:58 +0000 (GMT)

> /* 3 asm instructions */
> void release_exclusive(struct rw_mutex* rwm)
> {
> read_unlock(&rwm->rwl);
> if(rwm->wake_me_up) {
> rwm->wake_me_up = 0;
> wake_up(&rwm->wait);
> }
> }

That can race with another acquire surely. Suppose they set rmw->wake_me_up
and we then continue our release and clear it. Actually why do you want the
wake_me_up field ?

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