linux-kernel - Re: [PATCH] srcu: Isolate srcu sections using CONFIG

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Message-ID: <20141229110324.50f1339b@mschwide>
Date:	Mon, 29 Dec 2014 11:03:24 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com (supporter:S390),
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Anton Blanchard <anton@...ba.org>,
	Scott Wood <scottwood@...escale.com>,
	Andy Fleming <afleming@...escale.com>,
	Tiejun Chen <tiejun.chen@...driver.com>,
	Daniel Walter <dwalter@...gle.com>,
	Jens Freimann <jfrei@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linuxppc-dev@...ts.ozlabs.org (open list:LINUX FOR POWERPC...),
	linux-kernel@...r.kernel.org (open list),
	linux-s390@...r.kernel.org (open list:S390)
Subject: Re: [PATCH] srcu: Isolate srcu sections using CONFIG_SRCU

On Sat, 27 Dec 2014 12:17:43 -0500
Pranith Kumar <bobby.prani@...il.com> wrote:

> @@ -65,10 +65,13 @@
>  #include <asm/kexec.h>
>  #include <asm/mmu_context.h>
>  #include <asm/code-patching.h>
> -#include <asm/kvm_ppc.h>
>  #include <asm/hugetlb.h>
>  #include <asm/epapr_hcalls.h>
> 
> +#if IS_ENABLED(CONFIG_KVM)
> +#include <asm/kvm_ppc.h>
> +#endif
> +
>  #ifdef DEBUG
>  #define DBG(fmt...) udbg_printf(fmt)
>  #else

I always cringe when I see an include protected by an #ifdef.
Is this really necessary? All that is done in asm-offsets.c is
to calculate offsets, the code where the two offsets in question
are used (entry64.S) does have the #ifdef for CONFIG_KVM.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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