Re: [s390x][3.4-stable] compiling error: implicit declaration of function ‘io_remap_pfn_range’

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On 07/27/2013 04:32 AM, Greg Kroah-Hartman wrote:
On Wed, Jul 24, 2013 at 05:57:52AM +0100, Ben Hutchings wrote:
On Wed, 2013-07-24 at 00:36 -0400, Zhouping Liu wrote:
Hi all,

I hit the following compiling error on latest stable tree with linux-3.4.y branch on s390x machine:

---------------- snip ---------------
   CHK     include/linux/version.h
   CHK     include/generated/utsrelease.h
   CALL    scripts/checksyscalls.sh
   CHK     include/generated/compile.h
   CC      mm/memory.o
mm/memory.c: In function ‘vm_iomap_memory’:
mm/memory.c:2375:2: error: implicit declaration of function ‘io_remap_pfn_range’ [-Werror=implicit-function-declaration]
   return io_remap_pfn_range(vma, vma->vm_start, pfn, vm_len, vma->vm_page_prot);
   ^
cc1: some warnings being treated as errors
make[1]: *** [mm/memory.o] Error 1
make: *** [mm] Error 2

I checked codes, and find the function 'io_remap_pfn_range' in s390x was introduced by commit cd24834130a since 3.8-rc1,
but it didn't be backported to 3.4-stable yet, how to deal with this?
This is what I used in 3.2; it might work for 3.4 as well.
<snip>

Zhouping, can you test this patch from Ben and let me know if it solves
the problem for you or not?

Hi Greg & Ben,

I have tested the patch, the build error is gone with the patch.

Thanks,
Zhouping
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