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Date: Thu, 18 Aug 2016 01:28:08 +0100
From: Al Viro <viro@ZenIV.linux.org.uk>
To: zijun_hu <zijun_hu@zoho.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RESEND PATCH 1/1] bitops.h: move out get_count_order[_long]()
 from __KERNEL__ scope
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On Thu, Aug 18, 2016 at 08:10:19AM +0800, zijun_hu wrote:

> Documentation/kbuild/makefiles.txt：
> The kernel includes a set of headers that is exported to userspace.
> Many headers can be exported as-is but other headers require a
> minimal pre-processing before they are ready for user-space.
> The pre-processing does:
> - drop kernel-specific annotations
> - drop include of compiler.h
> - drop all sections that are kernel internal (guarded by ifdef __KERNEL__)
> 
> scripts/Makefile.headersinst:
> # ==========================================================================
> # Installing headers
> #
> # header-y  - list files to be installed. They are preprocessed
> #             to remove __KERNEL__ section of the file
> # genhdr-y  - Same as header-y but in a generated/ directory

Quite.  Now, could you show me where bitops.h is mentioned in any header-y
assignments?

Stuff outside of */uapi/* is not exported at all.