On Thu, 30 Jun 2005, Benjamin Herrenschmidt wrote:
>
> There are cases where using spin_lock instead of _irqsave version is a
> matter of correctness. For example, the page table lock beeing always
> taking without _irq is important to let the IPIs flow.
>
There's always exceptions! ;-)
As Jörn mentioned, you don't just use spin_lock_irqsave just to keep from
thinking, which I totally agree, but most of the time I use spin_locks, it
is better to not let interrupts flow, and for this reason, I try to keep
the places that use spin_locks as short as possible, since I don't want
100ms latencies.
-- Steve
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