linux-kernel - Re: PAGE_ALIGN() compile breakage

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Date:	Fri, 25 Jul 2008 12:27:48 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrea Righi <righi.andrea@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: PAGE_ALIGN() compile breakage

On Fri, Jul 25, 2008 at 12:14:55PM +0300, Adrian Bunk wrote:
> On Fri, Jul 25, 2008 at 01:55:37AM -0700, Andrew Morton wrote:
>...
> > pls test:
> > 
> > diff -puN include/linux/sched.h~a include/linux/sched.h
> > --- a/include/linux/sched.h~a
> > +++ a/include/linux/sched.h
> > @@ -2139,16 +2139,7 @@ static inline void set_task_cpu(struct t
> >  
> >  #endif /* CONFIG_SMP */
> >  
> > -#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
> >  extern void arch_pick_mmap_layout(struct mm_struct *mm);
> > -#else
> > -static inline void arch_pick_mmap_layout(struct mm_struct *mm)
> > -{
> > -	mm->mmap_base = TASK_UNMAPPED_BASE;
> > -	mm->get_unmapped_area = arch_get_unmapped_area;
> > -	mm->unmap_area = arch_unmap_area;
> > -}
> > -#endif
> >  
> >  #ifdef CONFIG_TRACING
> >  extern void
> > diff -puN mm/mmap.c~a mm/mmap.c
> > --- a/mm/mmap.c~a
> > +++ a/mm/mmap.c
> > @@ -2268,3 +2268,12 @@ int install_special_mapping(struct mm_st
> >  
> >  	return 0;
> >  }
> > +
> > +#ifndef HAVE_ARCH_PICK_MMAP_LAYOUT
> > +void arch_pick_mmap_layout(struct mm_struct *mm)
> > +{
> > +	mm->mmap_base = TASK_UNMAPPED_BASE;
> > +	mm->get_unmapped_area = arch_get_unmapped_area;
> > +	mm->unmap_area = arch_unmap_area;
> > +}
> > +#endif
> 
> Nice, this seems to fix the problem.
>...

Further testing revealed that you should choose a file that also gets 
compiled on MMU-less architectures:

<--  snip  -->

...
  LD      vmlinux
fs/built-in.o: In function `flush_old_exec':
(.text+0x6ae8): undefined reference to `arch_pick_mmap_layout'
fs/built-in.o: In function `flush_old_exec':
(.text+0x6cf0): undefined reference to `arch_pick_mmap_layout'
make[1]: *** [vmlinux] Error 1

<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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