linux-kernel - Re: [PATCH 1/5] crypto: sha256 - remove duplicate generic hash init function

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Date:   Thu, 23 Dec 2021 10:59:18 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Julian Calaby <julian.calaby@...il.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        linux-crypto@...r.kernel.org, linux-mips@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>
Subject: Re: [PATCH 1/5] crypto: sha256 - remove duplicate generic hash init
 function

Hi Julian,

On 12/23/21 6:35 AM, Julian Calaby wrote:
> Hi Tianjia,
> 
> On Mon, Dec 20, 2021 at 8:25 PM Tianjia Zhang
> <tianjia.zhang@...ux.alibaba.com> wrote:
>>
>> crypto_sha256_init() and sha256_base_init() are the same repeated
>> implementations, remove the crypto_sha256_init() in generic
>> implementation, sha224 is the same process.
>>
>> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
>> ---
>>   crypto/sha256_generic.c | 16 ++--------------
>>   1 file changed, 2 insertions(+), 14 deletions(-)
>>
>> diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c
>> index 3b377197236e..bf147b01e313 100644
>> --- a/crypto/sha256_generic.c
>> +++ b/crypto/sha256_generic.c
>> @@ -72,7 +60,7 @@ EXPORT_SYMBOL(crypto_sha256_finup);
>>
>>   static struct shash_alg sha256_algs[2] = { {
>>          .digestsize     =       SHA256_DIGEST_SIZE,
>> -       .init           =       crypto_sha256_init,
>> +       .init           =       sha256_base_init,
>>          .update         =       crypto_sha256_update,
>>          .final          =       crypto_sha256_final,
>>          .finup          =       crypto_sha256_finup,
>> @@ -86,7 +74,7 @@ static struct shash_alg sha256_algs[2] = { {
>>          }
>>   }, {
>>          .digestsize     =       SHA224_DIGEST_SIZE,
>> -       .init           =       crypto_sha224_init,
>> +       .init           =       sha224_base_init,
>>          .update         =       crypto_sha256_update,
>>          .final          =       crypto_sha256_final,
>>          .finup          =       crypto_sha256_finup,
> 
> Aren't these two functions defined as static inline functions? It
> appears that these crypto_ wrappers were added so there's "actual"
> referenceable functions for these structs.
> 
> Did this actually compile?
> 
> Thanks,
> 

Judging from the compilation results, there is really no difference, but 
the modification made by this patch is still necessary, because 
crypto_sha256_init() wrapper and sha256_base_init() are two completely 
duplicate functions.

Best regards,
Tianjia