linux-kernel - Re: [PATCH 2/3] nodemask.h: Fix compilation error with GCC12

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Message-ID: <Ylg8baQjQTkrnnD9@hirez.programming.kicks-ass.net>
Date:   Thu, 14 Apr 2022 17:23:25 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christophe de Dinechin <dinechin@...hat.com>
Cc:     trivial@...nel.org, Ben Segall <bsegall@...gle.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, Mel Gorman <mgorman@...e.de>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH 2/3] nodemask.h: Fix compilation error with GCC12

On Thu, Apr 14, 2022 at 05:08:54PM +0200, Christophe de Dinechin wrote:

> diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
> index 567c3ddba2c4..c6199dbe2591 100644
> --- a/include/linux/nodemask.h
> +++ b/include/linux/nodemask.h
> @@ -375,14 +375,13 @@ static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
>  }
>  
>  #if MAX_NUMNODES > 1
> -#define for_each_node_mask(node, mask)			\
> -	for ((node) = first_node(mask);			\
> -		(node) < MAX_NUMNODES;			\
> -		(node) = next_node((node), (mask)))
> +#define for_each_node_mask(node, mask)				    \
> +	for ((node) = first_node(mask);				    \
> +	     (node >= 0) && (node) < MAX_NUMNODES;		    \
> +	     (node) = next_node((node), (mask)))
>  #else /* MAX_NUMNODES == 1 */
> -#define for_each_node_mask(node, mask)			\
> -	if (!nodes_empty(mask))				\
> -		for ((node) = 0; (node) < 1; (node)++)
> +#define for_each_node_mask(node, mask)                                  \
> +	for ((node) = 0; (node) < 1 && !nodes_empty(mask); (node)++)
>  #endif /* MAX_NUMNODES */

Again, less readable code :/ And why?