linux-kernel - Re: [PATCH] crypto: virtio: Replace GFP_ATOMIC with GFP_KERNEL in __virtio_crypto_ablkcipher_do

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Message-ID: <20180803135814.452fdflcronacrjr@gondor.apana.org.au>
Date:   Fri, 3 Aug 2018 21:58:14 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     mst@...hat.com, jasowang@...hat.com, arei.gonglei@...wei.com,
        davem@...emloft.net, virtualization@...ts.linux-foundation.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: virtio: Replace GFP_ATOMIC with GFP_KERNEL in
 __virtio_crypto_ablkcipher_do_req()

On Mon, Jul 23, 2018 at 04:43:46PM +0800, Jia-Ju Bai wrote:
> __virtio_crypto_ablkcipher_do_req() is never called in atomic context.
> 
> __virtio_crypto_ablkcipher_do_req() is only called by 
> virtio_crypto_ablkcipher_crypt_req(), which is only called by 
> virtcrypto_find_vqs() that is never called in atomic context.
> 
> __virtio_crypto_ablkcipher_do_req() calls kzalloc_node() with GFP_ATOMIC,
> which is not necessary.
> GFP_ATOMIC can be replaced with GFP_KERNEL.
> 
> This is found by a static analysis tool named DCNS written by myself.
> I also manually check the kernel code before reporting it.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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