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    Subject[PATCH v3] powerpc/mm: fix undefined reference to `.__kernel_map_pages' on FSL PPC64
    arch/powerpc has __kernel_map_pages implementations in mm/pgtable_32.c, and
    mm/hash_utils_64.c, of which the former is built for PPC32, and the latter
    for PPC64 machines with PPC_STD_MMU. Fix arch/powerpc/Kconfig to not select
    ARCH_SUPPORTS_DEBUG_PAGEALLOC when CONFIG_PPC_STD_MMU_64 isn't defined,
    i.e., for 64-bit book3e builds to use the generic __kernel_map_pages()
    in mm/debug-pagealloc.c.

    LD init/built-in.o
    mm/built-in.o: In function `kernel_map_pages':
    include/linux/mm.h:2076: undefined reference to `.__kernel_map_pages'
    include/linux/mm.h:2076: undefined reference to `.__kernel_map_pages'
    include/linux/mm.h:2076: undefined reference to `.__kernel_map_pages'
    Makefile:925: recipe for target 'vmlinux' failed
    make: *** [vmlinux] Error 1

    Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
    ---
    v3:
    - fix wording for hash_utils_64.c implementation pointed out by
    Michael Ellerman
    - changed designation from 'mm:' to 'powerpc/mm:', as I think this
    now belongs in ppc-land

    v2:
    - corrected SUPPORTS_DEBUG_PAGEALLOC selection to enable
    non-STD_MMU_64 builds to use the generic __kernel_map_pages().

    depends on:
    From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    Date: Thu, 22 Jan 2015 10:28:58 +0900
    Subject: [PATCH] mm/debug_pagealloc: fix build failure on ppc and some other archs

    arch/powerpc/Kconfig | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
    index a2a168e..22b0940 100644
    --- a/arch/powerpc/Kconfig
    +++ b/arch/powerpc/Kconfig
    @@ -256,6 +256,7 @@ config PPC_OF_PLATFORM_PCI
    default n

    config ARCH_SUPPORTS_DEBUG_PAGEALLOC
    + depends on PPC32 || PPC_STD_MMU_64
    def_bool y

    config ARCH_SUPPORTS_UPROBES
    --
    2.2.2


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