linux-kernel - Re: [PATCH v2 6/6] crypto: ccree: rate limit debug print

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Date:   Mon, 2 Jul 2018 14:58:59 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Ofir Drang <ofir.drang@....com>, hadar.gat@....com,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/6] crypto: ccree: rate limit debug print

Hi Gilad,

On Sun, Jul 1, 2018 at 9:05 AM Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> A debug print about register status post interrupt can happen
> quite often. Rate limit it to avoid cluttering the log.
>
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Thanks for your patch!

> --- a/drivers/crypto/ccree/cc_driver.c
> +++ b/drivers/crypto/ccree/cc_driver.c
> @@ -131,8 +131,8 @@ static irqreturn_t cc_isr(int irq, void *dev_id)
>         }
>
>         if (irr) {
> -               dev_dbg(dev, "IRR includes unknown cause bits (0x%08X)\n",
> -                       irr);
> +               dev_dbg_ratelimited(dev, "IRR includes unknown cause bits (0x%08X)\n",
> +                                   irr);
>                 /* Just warning */
>         }

    cc_isr: 932 callbacks suppressed

Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

Note that it still printed 1410 lines like:

    ccree e6601000.crypto: Got IRR=0x008000D8 (actual value may differ)

but perhaps you do intend to see these during debugging?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds