linux-kernel - Re: [PATCH] gpu: ipu-v3: make array 'int

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Date:   Mon, 08 Jan 2018 09:38:33 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Colin King <colin.king@...onical.com>,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpu: ipu-v3: make array 'int_reg' static, shrinks
 object size

Hi Colin,

On Sat, 2018-01-06 at 17:28 +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate the const read-only array 'int_reg' on the stack but instead
> make it static. Makes the object code smaller by over 80 bytes:
> 
> Before:
>    text	   data	    bss	    dec	    hex	filename
>   28024	   8936	    192	  37152	   9120	drivers/gpu/ipu-v3/ipu-common.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>   27794	   9080	    192	  37066	   90ca	drivers/gpu/ipu-v3/ipu-common.o
> 
> (gcc version 7.2.0 x86_64)
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thank you for the patch.

> ---
>  drivers/gpu/ipu-v3/ipu-common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
> index 658fa2d3e40c..babf1aee7ca5 100644
> --- a/drivers/gpu/ipu-v3/ipu-common.c
> +++ b/drivers/gpu/ipu-v3/ipu-common.c
> @@ -1089,7 +1089,7 @@ static void ipu_irq_handler(struct irq_desc *desc)
>  {
>  	struct ipu_soc *ipu = irq_desc_get_handler_data(desc);
>  	struct irq_chip *chip = irq_desc_get_chip(desc);
> -	const int int_reg[] = { 0, 1, 2, 3, 10, 11, 12, 13, 14};
> +	static const int int_reg[] = { 0, 1, 2, 3, 10, 11, 12, 13, 14};
>  
>  	chained_irq_enter(chip, desc);

There's the same issue in ipu_irq_err_handler right below:

----------8<----------
diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index babf1aee7ca58..48685cddbad1b 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -1102,7 +1102,7 @@ static void ipu_err_irq_handler(struct irq_desc *desc)
 {
        struct ipu_soc *ipu = irq_desc_get_handler_data(desc);
        struct irq_chip *chip = irq_desc_get_chip(desc);
-       const int int_reg[] = { 4, 5, 8, 9};
+       static const int int_reg[] = { 4, 5, 8, 9};
 
        chained_irq_enter(chip, desc);
 
---------->8----------

If you don't mind, I'll amend this change.

regards
Philipp