linux-kernel - Re: [PATCH] s390: Include kvm_host.h header only if KVM is enabled

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Date:	Tue, 9 Dec 2014 07:15:22 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"supporter:S390" <linux390@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Jens Freimann <jfrei@...ux.vnet.ibm.com>,
	"open list:S390" <linux-s390@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] s390: Include kvm_host.h header only if KVM is enabled

On Mon, Dec 08, 2014 at 09:29:08PM -0500, Pranith Kumar wrote:
> On Mon, Dec 8, 2014 at 6:59 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> > On Mon, Dec 08, 2014 at 03:24:35PM -0500, Pranith Kumar wrote:
> >> KVM uses srcu structures because of which CONFIG_KVM selects CONFIG_SRCU. In
> >> asm-offsets.c, we are including kvm_host.h unconditionally even though
> >> CONFIG_KVM is not enabled because of which we get errors like follows:
> >>
> >>     In file included from arch/s390/kernel/asm-offsets.c:10:0:
> >> >> include/linux/kvm_host.h:363:21: error: field 'srcu' has incomplete type
> >>       struct srcu_struct srcu;
> >>                          ^
> >> >> include/linux/kvm_host.h:364:21: error: field 'irq_srcu' has incomplete type
> >>       struct srcu_struct irq_srcu;
> >>                          ^
> >>     make[2]: *** [arch/s390/kernel/asm-offsets.s] Error 1
> >>     make[2]: Target '__build' not remade because of errors.
> >>     make[1]: *** [prepare0] Error 2
> >>     make[1]: Target 'prepare' not remade because of errors.
> >>     make: *** [sub-make] Error 2
> >>
> >> This patch fixes these by including kvm_host.h conditionally on CONFIG_KVM.
> >>
> >> Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
> >
> > To make the commits bisectable, we need to combine these two patches,
> > correct?
> >
> 
> Yes, if the s390 maintainers raise no objections, I will combine this
> with the other patch and send it.

That's fine with me.

> >>  arch/s390/kernel/asm-offsets.c | 7 ++++++-
> >>  1 file changed, 6 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
> >> index ef279a1..055334d 100644
> >> --- a/arch/s390/kernel/asm-offsets.c
> >> +++ b/arch/s390/kernel/asm-offsets.c
> >> @@ -7,12 +7,15 @@
> >>  #define ASM_OFFSETS_C
> >>
> >>  #include <linux/kbuild.h>
> >> -#include <linux/kvm_host.h>
> >>  #include <linux/sched.h>
> >>  #include <asm/idle.h>
> >>  #include <asm/vdso.h>
> >>  #include <asm/pgtable.h>
> >>
> >> +#ifdef CONFIG_KVM
> >> +#include <linux/kvm_host.h>
> >> +#endif
> >> +

Even though I'm wondering why linux/kvm_host.h doesn't have such an #ifdef
included. Not that it would help in this case, but it would help to omit
the #ifdef around the #include statement here.

Looking a bit further.. so arch/s390/include/asm/kvm_host.h includes
include/linux/kvm_host.h and vice versa. Nice ;)

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