linux-kernel - Re: [PATCH] drivers/char/agp: Remove unnecessary variable assignment in agp_generic_create_gatt

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Date:   Thu, 16 Jun 2022 13:51:24 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Gautam Menghani <gautammenghani201@...il.com>, airlied@...ux.ie
Cc:     linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] drivers/char/agp: Remove unnecessary variable assignment
 in agp_generic_create_gatt_table()

On 6/16/22 12:19 PM, Gautam Menghani wrote:
> Remove unnecessary variable assignment in the function
> agp_generic_create_gatt_table(). This fixes the clang scan warnings:
> 
> warning: Value stored to 'page_order' is never read [deadcode.DeadStores]
>          page_order = num_entries = 0;
> 
> warning: Although the value stored to 'num_entries' is used in the
> enclosing expression, the value is never actually read from 'num_entries'
> [deadcode.DeadStores]
> 
> Signed-off-by: Gautam Menghani <gautammenghani201@...il.com>
> ---
>   drivers/char/agp/generic.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
> index 3ffbb1c80c5c..046ef61132f6 100644
> --- a/drivers/char/agp/generic.c
> +++ b/drivers/char/agp/generic.c
> @@ -864,7 +864,6 @@ int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
>   	table = NULL;
>   	i = bridge->aperture_size_idx;
>   	temp = bridge->current_size;
> -	page_order = num_entries = 0;

It would be safe to initialize page_order and num_entries when
they are declared a few lines above.

>   
>   	if (bridge->driver->size_type != FIXED_APER_SIZE) {
>   		do {
> 

thanks,
-- Shuah