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

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Date:	Wed, 17 Aug 2016 18:20:56 +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 Tue, Aug 16, 2016 at 03:46:22PM +0800, zijun_hu wrote:
> From: zijun_hu <zijun_hu@....com>
> 
> move out get_count_order[_long]() definitions from scope limited
> by macro __KERNEL__
> 
> it not only make both functions available in wider region regardless
> of whether __KERNEL__ is defined but also keep original region for
> get_count_order() before the recent commit c513b4cd2fe9
> ("mm-vmalloc-fix-align-value-calculation-error-v2-fix-fix") 

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?