Re: [PATCH] AB-BA deadlock between uidhash_lock and tasklist_lock.

[Jesper Juhl]

On Thu, 23 Dec 2004, Andrew Morton wrote:

> +/*
> + * uidhash_lock is taken inside write_lock_irq(&tasklist_lock).  If a timer
> + * interrupt were to occur while we hold uidhash_lock, and that interrupt takes
> + * read_lock(&tasklist_lock) then we have an ab/ba deadlock scenario.  Hence
> + * uidhash_lock must always be taken in an ir-qsafe manner to hold off the
> + * timer interrupt.
> + */

Miniature nit: You write "... ir-qsafe manner ...", I'm fairly certain you 
mean "... irq-safe manner ..." :-)


-- 
Jesper Juhl

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