linux-kernel - Re: [PATCH] ARM: bL_switcher: use IS_ERR_OR

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Date:   Thu, 24 Jun 2021 10:23:23 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Tang Bin <tangbin@...s.chinamobile.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: bL_switcher: use IS_ERR_OR_NULL() to simplify code

On Thu, Jun 24, 2021 at 03:42:23PM +0800, Tang Bin wrote:
> diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c
> index 9a9aa5354..b8e8e2567 100644
> --- a/arch/arm/common/bL_switcher.c
> +++ b/arch/arm/common/bL_switcher.c
> @@ -352,11 +352,9 @@ int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id,
>  
>  	t = &bL_threads[cpu];
>  
> -	if (IS_ERR(t->task))
> -		return PTR_ERR(t->task);
> -	if (!t->task)
> -		return -ESRCH;
> -
> +	if (IS_ERR_OR_NULL(t->task))
> +		return t->task ? PTR_ERR(t->task) : -ESRCH;
> +
>  	spin_lock(&t->lock);
>  	if (t->completer) {
>  		spin_unlock(&t->lock);

I don't think this improves the code. The original is more readable, and
readability is what we care about rather than code compactness.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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