On Fri, 4 Dec 2015 15:14:24 -0800 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> There's also the matter of CONFIG_MMU=n.
ah, Arnd already fixed this one. I guess I'll retain the patches
for now.
From: Arnd Bergmann <arnd@xxxxxxxx>
Subject: ARM: avoid ARCH_MMAP_RND_BITS for NOMMU
ARM kernels with MMU disabled fail to build because of CONFIG_ARCH_MMAP_RND_BITS:
kernel/built-in.o:(.data+0x754): undefined reference to `mmap_rnd_bits'
kernel/built-in.o:(.data+0x76c): undefined reference to `mmap_rnd_bits_min'
kernel/built-in.o:(.data+0x770): undefined reference to `mmap_rnd_bits_max'
This changes the newly added line to only select this allow for
MMU-enabled kernels.
Fixes: 14570b3fd31a ("arm: mm: support ARCH_MMAP_RND_BITS")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Daniel Cashman <dcashman@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN arch/arm/Kconfig~arm-mm-support-arch_mmap_rnd_bits-fix arch/arm/Kconfig
--- a/arch/arm/Kconfig~arm-mm-support-arch_mmap_rnd_bits-fix
+++ a/arch/arm/Kconfig
@@ -35,7 +35,7 @@ config ARM
select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32
select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32
- select HAVE_ARCH_MMAP_RND_BITS
+ select HAVE_ARCH_MMAP_RND_BITS if MMU
select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
select HAVE_ARCH_TRACEHOOK
select HAVE_BPF_JIT
_
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