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

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

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 âsteal_account_process_tickâ:
> kernel/sched/cputime.c:260:24: error: âparavirt_steal_enabledâ 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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