linux-kernel - Re: [RESEND PATCH 1/1] bitops.h: move out get_count_order[_long]() from __KERNEL_

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Date:	Thu, 18 Aug 2016 00:59:14 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	zijun_hu <zijun_hu@...o.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH 1/1] bitops.h: move out get_count_order[_long]()
 from __KERNEL__ scope

On Thu, Aug 18, 2016 at 07:51:19AM +0800, zijun_hu wrote:
> > What the hell is anything without __KERNEL__ doing with linux/bitops.h in
> > the first place?  IOW, why do we have those ifdefs at all?
> > 
> 
> __KERNEL__ is used to indicate the relevant sections within kernel
> headers can't be exported to or used by user space

ITYM "used to be used".  These days it's "everything outside of */uapi/*.h
can't be exported"...