[PATCH] Arm64: Fix build error while switching from LE to BE

[geoff@infradead.org (Geoff Levand)]

Hi Arun,

On Wed, 2014-06-25 at 20:39 +0530, arun chandran wrote:
> Selecting CPU_BIG_ENDIAN and building the kernel fails just after
> building it for little endian with the message
> 
>    VDSOA arch/arm64/kernel/vdso/gettimeofday.o
>    VDSOL arch/arm64/kernel/vdso/vdso.so.dbg
> /gcc-linaro-aarch64_be-linux-gnu-4.9-2014.05_linux/bin/../lib/gcc/aarch64_be-linux-gnu/4.9.1/../../../../aarch64_be-linux-gnu/bin/ld:
> arch/arm64/kernel/vdso/note.o: compiled for a little endian system and
> target is big endian
> /gcc-linaro-aarch64_be-linux-gnu-4.9-2014.05_linux/bin/../lib/gcc/aarch64_be-linux-gnu/4.9.1/../../../../aarch64_be-linux-gnu/bin/ld:
> failed to merge target specific data of file
> arch/arm64/kernel/vdso/note.o
> /gcc-linaro-aarch64_be-linux-gnu-4.9-2014.05_linux/bin/../lib/gcc/aarch64_be-linux-gnu/4.9.1/../../../../aarch64_be-linux-gnu/bin/ld:
> arch/arm64/kernel/vdso/sigreturn.o: compiled for a little endian system
> and target is big endian
> /gcc-linaro-aarch64_be-linux-gnu-4.9-2014.05_linux/bin/../lib/gcc/aarch64_be-linux-gnu/4.9.1/../../../../aarch64_be-linux-gnu/bin/ld:
> failed to merge target specific data of file
> arch/arm64/kernel/vdso/sigreturn.o
> collect2: error: ld returned 1 exit status
> make[2]: *** [arch/arm64/kernel/vdso/vdso.so.dbg] Error 1
> make[1]: *** [arch/arm64/kernel/vdso] Error 2
> make: *** [arch/arm64/kernel] Error 2
> make: *** Waiting for unfinished jobs....
> 
> Fix it by 'Forcing' the build in arch/arm64/kernel/vdso/Makefile
> 
> Signed-off-by: Arun Chandran <achandran@mvista.com>

This seems like a bit too much to put into the commit log.  What about
something like:

  Selecting CPU_BIG_ENDIAN and building the kernel fails just after
  building it for little endian.  Fix it by 'Forcing' the build of
  vdso.  Fixes build errors like these:

    arch/arm64/kernel/vdso/note.o: compiled for a little endian system and target is big endian

-Geoff