Subject: mmotm 2015-01-23-16-19: build failures due to 'mm/page_alloc.c: don't offset memmap for flatmem'

From: Guenter Roeck <[email-masked]>
Date: Fri, 23 Jan 2015 23:03:41 -0800

On Fri, Jan 23, 2015 at 04:19:40PM -0800, [email-masked] wrote:
> The mm-of-the-moment snapshot 2015-01-23-16-19 has been uploaded to
> 
>    http://www.ozlabs.org/~akpm/mmotm/
> 
New build failure:

mm/page_alloc.c: In function 'alloc_node_mem_map':
mm/page_alloc.c:4973: error: 'ARCH_PFN_OFFSET' undeclared (first use in this
function)
mm/page_alloc.c:4973: error: (Each undeclared identifier is reported only once
mm/page_alloc.c:4973: error: for each function it appears in.)
make[1]: *** [mm/page_alloc.o] Error 1

Culprit is c2ae2ed329 ("mm/page_alloc.c: don't offset memmap for flatmem").
While the code in question was already there, it is now also built if
CONFIG_FLATMEM is defined. Since the file defining ARCH_PFN_OFFSET
is not directly included, the build now fails for some architectures.

Affected:
	avr32:defconfig
	avr32:merisc_defconfig
	avr32:atngw100mkii_evklcd101_defconfig
	m68k:m5272c3_defconfig
	m68k:m5307c3_defconfig
	m68k:m5249evb_defconfig
	m68k:m5407c3_defconfig
	mn10300:asb2303_defconfig
	mn10300:asb2364_defconfig

Guenter

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