Re: [BUGFIX 2/3] crypto: Remove CRYPTO_TFM_REQ_MAY_SLEEP flag inAES-NI accelerated ecb/cbc mode

From: Huang Ying
Date: Thu Jun 18 2009 - 20:55:32 EST

On Thu, 2009-06-18 at 19:40 +0800, Herbert Xu wrote:
> On Mon, Jun 15, 2009 at 05:04:57PM +0800, Huang Ying wrote:
> > Because AES-NI instructions will touch XMM state, corresponding code
> > must be enclosed within kernel_fpu_begin/end, which used
> > preempt_disable/enable. So sleep should be prevented between
> > kernel_fpu_begin/end.
> >
> > Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
> I'll apply this for now. But it would be much better to allow
> sleeping in this case.
> Couldn't we simply move the kernel_fpu_begin/end inside the loop?
> It shouldn't be too expensive when it runs the 2nd time since it
> doesn't have to save anything, right?

I will test the performance difference.

Best Regards,
Huang Ying

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at