From: Jens Axboe on
On Mon, May 10 2010, wzt.wzt(a) wrote:
> Check major number before allocate the buffer, if the major number is not exist,
> and the register_blkdev() called many times, kmalloc()/kfree() will be no need
> to invoked many times. So check the major number before use kmalloc() to allocate
> the buffer will be better.

This would generally be sound advice for performance oriented code, but
I can't see it making any difference here.

Jens Axboe

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