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

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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

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