Re: [PATCH] Sparsemem build fix.

[Andy Whitcroft <apw@shadowen.org>]

Ralf Baechle wrote:
> <linux/mmzone.h> uses PAGE_SIZE, PAGE_SHIFT from <asm/page.h> without
> including that header itself.  For some sparsemem configurations this
> may result in build errors like:
> 
>   CC      init/initramfs.o
> In file included from include/linux/gfp.h:4,
>                  from include/linux/slab.h:15,
>                  from include/linux/percpu.h:4,
>                  from include/linux/rcupdate.h:41,
>                  from include/linux/dcache.h:10,
>                  from include/linux/fs.h:226,
>                  from init/initramfs.c:2:
> include/linux/mmzone.h:498:22: warning: "PAGE_SHIFT" is not defined
> In file included from include/linux/gfp.h:4,
>                  from include/linux/slab.h:15,
>                  from include/linux/percpu.h:4,
>                  from include/linux/rcupdate.h:41,
>                  from include/linux/dcache.h:10,
>                  from include/linux/fs.h:226,
>                  from init/initramfs.c:2:
> include/linux/mmzone.h:526: error: `PAGE_SIZE' undeclared here (not in a function)
> include/linux/mmzone.h: In function `__pfn_to_section':
> include/linux/mmzone.h:573: error: `PAGE_SHIFT' undeclared (first use in this function)
> include/linux/mmzone.h:573: error: (Each undeclared identifier is reported only once
> include/linux/mmzone.h:573: error: for each function it appears in.)
> include/linux/mmzone.h: In function `pfn_valid':
> include/linux/mmzone.h:578: error: `PAGE_SHIFT' undeclared (first use in this function)
> make[1]: *** [init/initramfs.o] Error 1
> make: *** [init] Error 2
> 
> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 3674035..2d83371 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -15,6 +15,7 @@ #include <linux/init.h>
>  #include <linux/seqlock.h>
>  #include <linux/nodemask.h>
>  #include <asm/atomic.h>
> +#include <asm/page.h>
>  
>  /* Free memory management - zoned buddy allocator.  */
>  #ifndef CONFIG_FORCE_MAX_ZONEORDER
> -
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Seems completely reasonable.

-apw
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