From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH 0/3] Add __ioread32_copy() and use it
Date: Wed, 16 Sep 2015 04:55:46 +0200
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Cc: Andi Kleen <andi@firstfloor.org>, Stephen Boyd <sboyd@codeaurora.org>, Andy Gross <agross@codeaurora.org>, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-soc@vger.kernel.org, linux-mips@linux-mips.org, Hauke Mehrtens <hauke@hauke-m.de>, Paul Walmsley <paul@pwsan.com>, =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>, Bjorn Andersson <bjorn.andersson@sonymobile.com>

> Under what circumstances will the compiler (or linker?) do this? 

Compiler.

> LTO enabled?

Yes it's for LTO.  The optimization allows the compiler to drop unused
functions, which is very popular with users (a lot use it to get smaller
kernel images)

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.