linux-kernel - Re: [PATCH 0/3] Add __ioread32

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Date:	Wed, 16 Sep 2015 04:32:19 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-soc@...r.kernel.org,
	linux-mips@...ux-mips.org, Hauke Mehrtens <hauke@...ke-m.de>,
	Paul Walmsley <paul@...an.com>,
	Rafał Miłecki <zajec5@...il.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 0/3] Add __ioread32_copy() and use it

> __iowrite32_copy() is marked __visible.  I don't actually know what
> that does and Andi's d47d5c8194579bc changelog (which sucks the big
> one) didn't explain it.  Apparently it has something to do with being
> implemented in assembly, but zillions of functions are implemented in
> assembly, so why are only two functions marked this way?  Anyway,
> __ioread32_copy() is implemented in C so I guess __visible isn't needed
> there.

__visible is needed for C functions that are called from assembler.
Otherwise the compiler may optimize them away.

-Andi
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