linux-kernel - Re: [PATCH v4 21/21] sparc64: use match

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Message-ID: <CAHp75VcvYr1PWxoSMpNXRxpAwxRKam9iwj7fH9_uZPojNCreGQ@mail.gmail.com>
Date:   Thu, 21 Jun 2018 05:24:46 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Yisheng Xie <xieyisheng1@...wei.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,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH v4 21/21] sparc64: use match_string() helper

On Thu, Jun 21, 2018 at 4:39 AM, 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.
>
> As Andy's suggestion, this patch add string literal instead of NULL
> for crypto in array of hwcaps and make an additional condition after
> match_string() in all users of it.
>

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Anthony Yznaga <anthony.yznaga@...cle.com>
> Cc: Pavel Tatashin <pasha.tatashin@...cle.com>
> Cc: sparclinux@...r.kernel.org
> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> ---
>  arch/sparc/kernel/setup_64.c | 24 +++++++++---------------
>  1 file changed, 9 insertions(+), 15 deletions(-)
>
> diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
> index 7944b3c..6fa0c78 100644
> --- a/arch/sparc/kernel/setup_64.c
> +++ b/arch/sparc/kernel/setup_64.c
> @@ -401,8 +401,7 @@ void __init start_early_boot(void)
>          */
>         "mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
>         "ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
> -       "ima", "cspare", "pause", "cbcond", NULL /*reserved for crypto */,
> -       "adp",
> +       "ima", "cspare", "pause", "cbcond", "crypto", "adp",
>  };
>
>  static const char *crypto_hwcaps[] = {
> @@ -418,7 +417,7 @@ void cpucap_info(struct seq_file *m)
>         seq_puts(m, "cpucaps\t\t: ");
>         for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
>                 unsigned long bit = 1UL << i;
> -               if (hwcaps[i] && (caps & bit)) {
> +               if ((caps & bit) && bit != HWCAP_SPARC_CRYPTO) {
>                         seq_printf(m, "%s%s",
>                                    printed ? "," : "", hwcaps[i]);
>                         printed++;
> @@ -472,7 +471,7 @@ static void __init report_hwcaps(unsigned long caps)
>
>         for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
>                 unsigned long bit = 1UL << i;
> -               if (hwcaps[i] && (caps & bit))
> +               if ((caps & bit) && bit != HWCAP_SPARC_CRYPTO)
>                         report_one_hwcap(&printed, hwcaps[i]);
>         }
>         if (caps & HWCAP_SPARC_CRYPTO)
> @@ -504,18 +503,13 @@ static unsigned long __init mdesc_cpu_hwcap_list(void)
>         while (len) {
>                 int i, plen;
>
> -               for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
> -                       unsigned long bit = 1UL << i;
> +               i = match_string(hwcaps, ARRAY_SIZE(hwcaps), prop);
> +               if (i >= 0)
> +                       caps |= 1UL << i;
>
> -                       if (hwcaps[i] && !strcmp(prop, hwcaps[i])) {
> -                               caps |= bit;
> -                               break;
> -                       }
> -               }
> -               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
>
>



-- 
With Best Regards,
Andy Shevchenko