linux-kernel - Re: [RFC 1/3] headers: add more types to linux/types.h

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Message-ID: <Ya979Hh0V2CdhNSU@casper.infradead.org>
Date:   Tue, 7 Dec 2021 15:21:24 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        kernel test robot <lkp@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tejun Heo <tj@...nel.org>, kernelci@...ups.io,
        linux-fsdevel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [RFC 1/3] headers: add more types to linux/types.h

On Tue, Dec 07, 2021 at 04:09:25PM +0100, Arnd Bergmann wrote:
> +struct list_lru {
> +	struct list_lru_node	*node;
> +#ifdef CONFIG_MEMCG_KMEM
> +	struct list_head	list;
> +	int			shrinker_id;
> +	bool			memcg_aware;
> +#endif
> +};

This is the only one that gives me qualms.  While there are other
CONFIG options mentioned in types.h they're properties of the platform,
eg CONFIG_HAVE_UID16, CONFIG_64BIT, CONFIG_ARCH_DMA_ADDR_T_64BIT, etc.
I dislike it that changing this CONFIG option is going to result in
rebuilding the _entire_ kernel.  CONFIG_MEMCG_KMEM just isn't that
central to how everything works.