linux-kernel - Re: [PATCH *-next 01/18] mm/mmu_gather: Remove needless return in void API tlb_remove

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Message-ID: <a28f04e5-ccde-4a08-b8fa-a9fa685240b1@icloud.com>
Date: Mon, 24 Feb 2025 22:45:44 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Zijun Hu <quic_zijuhu@...cinc.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Will Deacon <will@...nel.org>, "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, Nick Piggin <npiggin@...il.com>,
 Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 "David S. Miller" <davem@...emloft.net>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 Johannes Berg <johannes@...solutions.net>,
 Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>,
 Jiri Pirko <jiri@...nulli.us>, Jason Gunthorpe <jgg@...pe.ca>,
 Leon Romanovsky <leon@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
 Bartosz Golaszewski <brgl@...ev.pl>, Lee Jones <lee@...nel.org>,
 Thomas Graf <tgraf@...g.ch>, Christoph Hellwig <hch@....de>,
 Marek Szyprowski <m.szyprowski@...sung.com>,
 Robin Murphy <robin.murphy@....com>,
 Miquel Raynal <miquel.raynal@...tlin.com>,
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>,
 linux-arch@...r.kernel.org, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
 netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
 linux-rdma@...r.kernel.org, linux-gpio@...r.kernel.org,
 linux-pm@...r.kernel.org, iommu@...ts.linux.dev,
 linux-mtd@...ts.infradead.org
Subject: Re: [PATCH *-next 01/18] mm/mmu_gather: Remove needless return in
 void API tlb_remove_page()

On 2025/2/24 21:23, Peter Zijlstra wrote:
> On Sat, Feb 22, 2025 at 07:00:28PM +0800, Zijun Hu wrote:
>> On 2025/2/22 04:01, Peter Zijlstra wrote:
>>>>   */
>>>>  static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
>>>>  {
>>>> -	return tlb_remove_page_size(tlb, page, PAGE_SIZE);
>>>> +	tlb_remove_page_size(tlb, page, PAGE_SIZE);
>>>>  }
>>> So I don't mind removing it, but note that that return enforces
>>> tlb_remove_page_size() has void return type.
>>>
>>
>> tlb_remove_page_size() is void function already. (^^)
> 
> Yes, but if you were to change that, the above return would complain.
> 
>>> It might not be your preferred coding style, but it is not completely
>>> pointless.
>>
>> based on below C spec such as C17 description. i guess language C does
>> not like this usage "return void function in void function";
> 
> This is GNU extension IIRC. Note kernel uses GNU11, not C11

any link to share about GNU11's description for this aspect ? (^^)