linux-kernel - Re: [PATCH] asm-generic: make more kernel-space headers mandatory

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Date:   Mon, 10 Feb 2020 14:30:52 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org, Michal Simek <michal.simek@...inx.com>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Christoph Hellwig <hch@....de>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] asm-generic: make more kernel-space headers mandatory

On Tue, 11 Feb 2020 02:54:52 +0900 Masahiro Yamada <masahiroy@...nel.org> wrote:

> Change a header to mandatory-y if both of the following are met:
> 
> [1] At least one architecture (except um) specifies it as generic-y in
>     arch/*/include/asm/Kbuild
> 
> [2] Every architecture (except um) either has its own implementation
>     (arch/*/include/asm/*.h) or specifies it as generic-y in
>     arch/*/include/asm/Kbuild

(reads Documentation/kbuild/makefiles.rst to remember what these things
do).

Why are we making this change?  What's the benefit?