linux-kernel - Re: [PATCH] kvm: Make kvm

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Message-ID: <20130805225759.GO19750@two.firstfloor.org>
Date:	Tue, 6 Aug 2013 00:57:59 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Andi Kleen <ak@...ux.intel.com>,
	gleb@...hat.com, kvm@...r.kernel.org, pbonzini@...hat.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kvm: Make kvm_rebooting visible

> >  static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
> >
> >-bool kvm_rebooting;
> >+__visible bool kvm_rebooting;
> >  EXPORT_SYMBOL_GPL(kvm_rebooting);
> 
> How many of these are there kernel wide?

Not very many (at least on x86 allyes) <~10.
Also most users are not exported.

Probably not worth an own macro.

> 
> Could you do something like this instead:
> 
> DEFINE_AND_EXPORT_GPL(bool, kvm_rebooting);
> 
> The definition of DEFINE_AND_EXPORT_GPL(_type, _name) is left as an
> exercise for the reader.

I actually had EXPORT_SYMBOL make things always visible for a long time,
but it prevents optimizing away unused code in very small
non modular configurations. So I switched to separate annotations.

-Andi

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