arm64: add ftrace support

[AKASHI Takahiro]

On 10/25/2013 08:39 PM, Jens Meier wrote:
> Hi,
>
> I had some problems applying/compiling Akashi’s ftrace patches.
> - There is an invocation of insn.o missing in the first Makefile patch
> - <asm/insn.h> is missing in the patch set as well as in the latest upstream kernel although included from ftrace.c

Yeah, my patches requires "hotpatch code" interfaces from Jiang Liu, Huawei:
    [PATCH v5 0/7] Optimize jump label implementation for ARM64

Sorry for not mentioning it clearly.
Actually <asm/insn.h> is necessary only in patch [2/6].

-Takahiro AKASHI

>
> Best Regards
> Jens
>
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