linux-kernel - Re: [PATCH] sched/core: don't include asm/mmu

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Date:	Fri, 13 May 2016 11:28:26 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Russell King <linux@....linux.org.uk>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...e.de>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...hsingularity.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched/core: don't include asm/mmu_context from drivers

On Thursday 12 May 2016 22:46:56 Andy Lutomirski wrote:
> On Fri, Apr 29, 2016 at 6:42 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > On Fri, 29 Apr 2016 10:52:32 +0200
> > Arnd Bergmann <arnd@...db.de> wrote:
> >
> >> This reverts the earlier fix attempt and works around the problem
> >> by including both linux/mmu_context.h and asm/mmu_context.h from
> >> kernel/sched/core.c. This is not a good solution but seems less
> >> hacky than the alternatives.
> >
> > What about simply not compiling finish_arch_post_lock_switch() when
> > building modules?
> >
> > (untested, not compiled or anything)
> >
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> > ---
> > diff --git a/arch/arm/include/asm/mmu_context.h b/arch/arm/include/asm/mmu_context.h
> > index fa5b42d44985..3f22d1b6bac8 100644
> > --- a/arch/arm/include/asm/mmu_context.h
> > +++ b/arch/arm/include/asm/mmu_context.h
> > @@ -66,6 +66,7 @@ static inline void check_and_switch_context(struct mm_struct *mm,
> >                 cpu_switch_mm(mm->pgd, mm);
> >  }
> >
> > +#ifndef MODULE
> >  #define finish_arch_post_lock_switch \
> >         finish_arch_post_lock_switch
> >  static inline void finish_arch_post_lock_switch(void)
> > @@ -87,6 +88,7 @@ static inline void finish_arch_post_lock_switch(void)
> >                 preempt_enable_no_resched();
> >         }
> >  }
> > +#endif /* !MODULE */
> >
> >  #endif /* CONFIG_MMU */
> >
> 
> 
> Can someone in arm land ack this so Ingo can apply it?
> 

Sorry I forgot about this when I had my original patch in the
randconfig patch stack. I've reverted this now and am testing
with Steve's version. If I see no other regressions, I'll resend
this with a proper changelog and Russell's Ack.

	Arnd