linux-kernel - Re: [PATCH 3/4] asmlinkage, x86: Add explicit _

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Message-ID: <CA+55aFyVD5MEt2-sKg8roFJymT1gHHadqq=+q1GBje=mObQhXg@mail.gmail.com>
Date:	Tue, 1 Apr 2014 12:09:24 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH 3/4] asmlinkage, x86: Add explicit __visible to arch/x86/crypto/*

On Tue, Apr 1, 2014 at 11:53 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> You're adding them to assembly routines called from C, which is
> exactly the wrong way around, and pointless. And it's worse than
> pointless churn, it just confuses people, and shows that you are
> confused about the meaning of it.

Basically, all these grep's should return the empty set:

   git grep static.*__visible
   git grep extern.*__visible
   git grep "__visible.*(.*);"

because they are all signs of confusion. A 'static' variable
(declaration _or_ definition) should never be externally visible (as a
definition it might be called from inline asm, I guess, but then it
should be done as an argument so that the compiler sees the use). An
extern declaration can never sanely be marked "__visible", because the
only use of such a declaration is for C code (which by definition
doesn't need it). And the last case is for a function declaration,
which have an implicit extern.

And yeah, we do have a few confused users already (28, to be exact).
They should be fixed. But more importantly, we certainly shouldn't be
adding more of them.

                    Linus
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