linux-kernel - Re: [PATCH] crypto: amlogic - Save a few bytes of memory

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Date:   Tue, 22 Nov 2022 23:36:35 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Corentin Labbe <clabbe@...libre.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH] crypto: amlogic - Save a few bytes of memory

Le 22/11/2022 à 23:02, Martin Blumenstingl a écrit :
> On Tue, Nov 22, 2022 at 10:57 PM Christophe JAILLET
> <christophe.jaillet@...adoo.fr> wrote:
>>
>> There is no real point in allocating dedicated memory for the irqs array.
>> MAXFLOW is only 2, so it is easier to allocated the needed space
>> directly within the 'meson_dev' structure.
>>
>> This saves some memory allocation and avoids an indirection when using the
>> irqs array.
> ..and it even fixes a missing devm_kcalloc error check
> 
> Personally I prefer this approach over a patch that was sent earlier today: [0]
> Corentin, Christophe, what do you think?
> 
> 
> Best regards,
> Martin
> 
> 
> [0] https://lore.kernel.org/linux-crypto/0df30bbf-3b7e-ed20-e316-41192bf3cc2b@linaro.org/T/#m6a45b44206c282f106d379b01d19027823c5d79b
> 

Unrelated, but I think that meson_irq_handler() needs a small ajustement 
to avoid printing a spurious message if readl() returns 0.

Maybe something like that?:


@@ -33,9 +33,10 @@ static irqreturn_t meson_irq_handler(int irq, void *data)
  				writel_relaxed(0xF, mc->base + ((0x4 + flow) << 2));
  				mc->chanlist[flow].status = 1;
  				complete(&mc->chanlist[flow].complete);
-				return IRQ_HANDLED;
+			} else {
+				dev_err(mc->dev, "%s %d Got irq for flow %d but ctrl is empty\n", 
__func__, irq, flow);
  			}
-			dev_err(mc->dev, "%s %d Got irq for flow %d but ctrl is empty\n", 
__func__, irq, flow);
+			return IRQ_HANDLED;
  		}
  	}


CJ