linux-kernel - Re: [PATCH 3/4] selftests/cgroup: cpu_hogger init: use {} instead of {NULL}

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Message-ID: <ZjUlBqTN1tmGj58q@P9FQF9L96D>
Date: Fri, 3 May 2024 10:55:18 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: John Hubbard <jhubbard@...dia.com>
Cc: Shuah Khan <shuah@...nel.org>, Tejun Heo <tj@...nel.org>,
	Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Waiman Long <longman@...hat.com>,
	Yosry Ahmed <yosryahmed@...gle.com>, Nhat Pham <nphamcs@...il.com>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Valentin Obst <kernel@...entinobst.de>,
	linux-kselftest@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	llvm@...ts.linux.dev
Subject: Re: [PATCH 3/4] selftests/cgroup: cpu_hogger init: use {} instead of
 {NULL}

On Thu, May 02, 2024 at 08:51:04PM -0700, John Hubbard wrote:
> First of all, in order to build with clang at all, one must first apply
> Valentin Obst's build fix for LLVM [1]. Once that is done, then when
> building with clang, via:
> 
>     make LLVM=1 -C tools/testing/selftests
> 
> ...clang generates warning here, because struct cpu_hogger has multiple
> fields, and the code is initializing an array of these structs, and it
> is incorrect to specify a single NULL value as the initializer.
> 
> Fix this by initializing with {}, so that the compiler knows to use
> default initializer values for all fields in each array entry.
> 
> [1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@valentinobst.de/
> 
> Signed-off-by: John Hubbard <jhubbard@...dia.com>

Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>