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Re: [PATCH v11 2/5] missing include asm/paravirt.h in cputime.c

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  Re: [PATCH v11 2/5] missing include asm/paravirt.h in cputime.c Peter Zijlstra <peterz@infradead.org> - 2015-11-05 17:50 +0100
    Re: [PATCH v11 2/5] missing include asm/paravirt.h in cputime.c Peter Zijlstra <peterz@infradead.org> - 2015-11-09 18:40 +0100
      Re: [PATCH v11 2/5] missing include asm/paravirt.h in cputime.c Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-11-10 12:30 +0100
        Re: [PATCH v11 2/5] missing include asm/paravirt.h in cputime.c Peter Zijlstra <peterz@infradead.org> - 2015-11-10 13:20 +0100

#1263419 — Re: [PATCH v11 2/5] missing include asm/paravirt.h in cputime.c

How can this be missing? Things compile fine now, right? So please
better explain why we do this change.
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#1265899

On Thu, Nov 05, 2015 at 05:30:01PM +0000, Stefano Stabellini wrote:
> On Thu, 5 Nov 2015, Peter Zijlstra wrote:
> > How can this be missing? Things compile fine now, right?
> 
> Fair enough.
> 
> 
> > So please better explain why we do this change.
> 
> asm/paravirt.h is included by one of the other headers included in
> kernel/sched/cputime.c on x86, but not on other architecures. On arm and
> arm64, where I am about to introduce asm/paravirt.h and stolen time
> support, without #include <asm/paravirt.h> in cputime.c I would get:
> 
> kernel/sched/cputime.c: In function ‘steal_account_process_tick’:
> kernel/sched/cputime.c:260:24: error: ‘paravirt_steal_enabled’ undeclared (first use in this function)
>   if (static_key_false(&paravirt_steal_enabled)) {
> 
> A bit of digging on x86 (using gcc -E on cputime.c) tells me that
> asm/paravirt.h is coming from the following include chain:
> 
> #include <kernel/sched/sched.h>
> #include <linux/spinlock.h>
> #include <linux/preempt.h>
> #include <asm/preempt.h>
> #include <linux/thread_info.h>
> #include <asm/thread_info.h>
> #include <asm/processor.h>
> #include <asm/msr.h>
> #include <asm/paravirt.h>


Fair enough; a slightly shorter version of that for a changelog will do
nicely.

Thanks!
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#1266418

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On Mon, 9 Nov 2015, Peter Zijlstra wrote:
> On Thu, Nov 05, 2015 at 05:30:01PM +0000, Stefano Stabellini wrote:
> > On Thu, 5 Nov 2015, Peter Zijlstra wrote:
> > > How can this be missing? Things compile fine now, right?
> > 
> > Fair enough.
> > 
> > 
> > > So please better explain why we do this change.
> > 
> > asm/paravirt.h is included by one of the other headers included in
> > kernel/sched/cputime.c on x86, but not on other architecures. On arm and
> > arm64, where I am about to introduce asm/paravirt.h and stolen time
> > support, without #include <asm/paravirt.h> in cputime.c I would get:
> > 
> > kernel/sched/cputime.c: In function ‘steal_account_process_tick’:
> > kernel/sched/cputime.c:260:24: error: ‘paravirt_steal_enabled’ undeclared (first use in this function)
> >   if (static_key_false(&paravirt_steal_enabled)) {
> > 
> > A bit of digging on x86 (using gcc -E on cputime.c) tells me that
> > asm/paravirt.h is coming from the following include chain:
> > 
> > #include <kernel/sched/sched.h>
> > #include <linux/spinlock.h>
> > #include <linux/preempt.h>
> > #include <asm/preempt.h>
> > #include <linux/thread_info.h>
> > #include <asm/thread_info.h>
> > #include <asm/processor.h>
> > #include <asm/msr.h>
> > #include <asm/paravirt.h>
> 
> 
> Fair enough; a slightly shorter version of that for a changelog will do
> nicely.

Sure. Can I add your Acked-by to it?

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#1266453

On Tue, Nov 10, 2015 at 11:27:33AM +0000, Stefano Stabellini wrote:
> On Mon, 9 Nov 2015, Peter Zijlstra wrote:
> > On Thu, Nov 05, 2015 at 05:30:01PM +0000, Stefano Stabellini wrote:
> > > On Thu, 5 Nov 2015, Peter Zijlstra wrote:
> > > > How can this be missing? Things compile fine now, right?
> > > 
> > > Fair enough.
> > > 
> > > 
> > > > So please better explain why we do this change.
> > > 
> > > asm/paravirt.h is included by one of the other headers included in
> > > kernel/sched/cputime.c on x86, but not on other architecures. On arm and
> > > arm64, where I am about to introduce asm/paravirt.h and stolen time
> > > support, without #include <asm/paravirt.h> in cputime.c I would get:
> > > 
> > > kernel/sched/cputime.c: In function ‘steal_account_process_tick’:
> > > kernel/sched/cputime.c:260:24: error: ‘paravirt_steal_enabled’ undeclared (first use in this function)
> > >   if (static_key_false(&paravirt_steal_enabled)) {
> > > 
> > > A bit of digging on x86 (using gcc -E on cputime.c) tells me that
> > > asm/paravirt.h is coming from the following include chain:
> > > 
> > > #include <kernel/sched/sched.h>
> > > #include <linux/spinlock.h>
> > > #include <linux/preempt.h>
> > > #include <asm/preempt.h>
> > > #include <linux/thread_info.h>
> > > #include <asm/thread_info.h>
> > > #include <asm/processor.h>
> > > #include <asm/msr.h>
> > > #include <asm/paravirt.h>
> > 
> > 
> > Fair enough; a slightly shorter version of that for a changelog will do
> > nicely.
> 
> Sure. Can I add your Acked-by to it?

Yep, no objection if the changelog is updated as per the above.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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