linux-kernel - Re: [PATCH v2 21/21] sparc64: use match

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Message-ID: <6fefc785-b6b7-e24f-2559-76ce70544717@huawei.com>
Date:   Mon, 4 Jun 2018 09:06:07 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Anthony Yznaga <anthony.yznaga@...cle.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        <sparclinux@...r.kernel.org>
Subject: Re: [PATCH v2 21/21] sparc64: use match_string() helper

Hi Andy,

On 2018/6/1 19:34, Andy Shevchenko wrote:
> On Thu, May 31, 2018 at 2:11 PM, Yisheng Xie <xieyisheng1@...wei.com> wrote:
>> match_string() returns the index of an array for a matching string,
>> which can be used instead of open coded variant.
> 
>> @@ -512,10 +512,9 @@ static unsigned long __init mdesc_cpu_hwcap_list(void)
>>                                 break;
>>                         }
>>                 }
> 
> It seems previous loop also can be replaced.

No, because the there is an NULL in the middle of the array hwcaps:
 static const char *hwcaps[] = {
          "flush", "stbar", "swap", "muldiv", "v9",
          "ultra3", "blkinit", "n2",

          /* These strings are as they appear in the machine description
           * 'hwcap-list' property for cpu nodes.
           */
          "mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
          "ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
          "ima", "cspare", "pause", "cbcond", NULL /*reserved for crypto */,
          "adp",
  };

Thanks
Yisheng
> 
>> -               for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
>> -                       if (!strcmp(prop, crypto_hwcaps[i]))
>> -                               caps |= HWCAP_SPARC_CRYPTO;
>> -               }
>> +               i = match_string(crypto_hwcaps, ARRAY_SIZE(crypto_hwcaps), prop);
>> +               if (i >= 0)
>> +                       caps |= HWCAP_SPARC_CRYPTO;
>>
>>                 plen = strlen(prop) + 1;
>>                 prop += plen;
>> --
>> 1.7.12.4
>>
> 
> 
>