Build failure on ARM64 for Linux 4.2-rc1 was: Linux 4.2-rc1

[Mark Langsdorf]

On 07/05/2015 03:22 PM, Linus Torvalds wrote:
> It's Sunday, two weeks have passed, and the merge window is closed. I
> just pushed out the tag to the git trees, and tar-balls and patches
> should be mirroring out too.

I'm seeing a build regression on arm64 for tools/perf.

On linux-4.1, it builds fine.

On linux-4.2-rc1, it dies with this relevant message (skipping the
missing defines, etc):

/home/mlangsdorf/tmp/linux-4.2/include/linux/preempt.h: At top level:
/home/mlangsdorf/tmp/linux-4.2/include/linux/preempt.h:64:25: fatal 
error: asm/preempt.h: No such file or directory
 #include <asm/preempt.h>

On both versions, arch/arm64/include/generated/asm/preempt.h
exists. I'm guessing something changed in the build system so
that's its not being picked up for 4.2-rc1 but I'm not sure where
to look.

--Mark Langsdorf
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