linux-kernel - Re: [PATCH] make __section

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Message-ID: <5790DE74.3080907@intel.com>
Date:	Thu, 21 Jul 2016 07:38:44 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	zhouchengming <zhouchengming1@...wei.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, tj@...nel.org, guohanjun@...wei.com,
	huawei.libin@...wei.com
Subject: Re: [PATCH] make __section_nr more efficient

On 07/20/2016 06:55 PM, zhouchengming wrote:
> Thanks for your reply. I don't know the compiler will optimize the loop.
> But when I see the assembly code of __section_nr, it seems to still have
> the loop in it.

Oh, well.  I guess it got broken in the last decade or so.  Your patch
looks good to me, and the fact that we ended up here means the original
approach was at least a little fragile.