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Date:   Tue, 5 Dec 2023 21:43:59 +0000
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     Nick Desaulniers <ndesaulniers@google.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>, tanzirh@google.com,
        Kees Cook <keescook@chromium.org>,
        Andy Shevchenko <andy@kernel.org>,
        linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org,
        Nick DeSaulniers <nnn@google.com>, llvm@lists.linux.dev
Subject: Re: [PATCH] lib/string: shrink lib/string.i via IWYU
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On Tue, Dec 05, 2023 at 01:39:47PM -0800, Nick Desaulniers wrote:

> The tooling Tanzir is working on does wrap IWYU, and does support such
> mapping (of 'low level' to 'high level' headers; more so, if it
> recommends X you can override to suggest Y instead).
> 
> arch/nios/ also doesn't provide a bug.h, which this patch is
> suggesting we include directly.  I guess the same goes for
> asm/rwonce.h.

See include/asm-generic/Kbuild:
mandatory-y += bug.h
...
mandatory-y += rwonce.h

IOW, sh will have asm/bug.h and as/rwonce.h copied from asm-generic.

Still, includes of asm/*.h had been a massive headache historically
and breeding more of those shouldn't be overdone.

More painful problem is arch- and config-dependent stuff, though...