Re: [PATCH V2 1/1] lib/atomic64 using raw_spin_lock_irq[save|resotre]for atomicity

From: Thomas Gleixner
Date: Thu Sep 01 2011 - 05:59:33 EST


On Thu, 1 Sep 2011, Shan Hai wrote:

> The spin_lock_irq[save|restore] could break the atomicity of the
> atomic64_* operations in the PREEMPT-RT configuration, because
> the spin_lock_irq[save|restore] themselves are preemptable in the
> PREEMPT-RT, using raw variant of the spin lock could provide the
> atomicity that atomic64_* need.

Good catch. Queued for the next release.

Thanks,

tglx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/