Subject: Re: [linuxppc-release] [PATCH v2 4/4] fsl-dma: use spin_lock_bh to instead of spin_lock_irqsave

From: Timur Tabi <[email-masked]>
Date: Wed, 11 Jul 2012 10:01:01 -0500

Qiang Liu wrote:
> Use spin_lock_bh to instead of spin_lock_irqsave for improving performance.

Please provide some evidence that performance has improved, as well as an
explanation why it's okay to use spin_lock_bh, and why it's faster.

-- 
Timur Tabi
Linux kernel developer at Freescale