compiling of tools/perf fail on x86 64bit kernel and 32bit userspace

[Riccardo Magliocchetti]

Hi,

with latest git, i cannot compile perf on 32 bit userspace with a 64 bit 
kernel.

~/src/linux-2.6/tools/perf$ make
PERF_VERSION = 2.6.39.rc6.224.g06d006f
    GEN common-cmds.h
    * new build flags or prefix
    CC perf.o
    CC builtin-annotate.o
    CC builtin-bench.o
    CC bench/sched-messaging.o
    CC bench/sched-pipe.o
    CC bench/mem-memcpy-x86-64-asm.o
bench/../../../arch/x86/lib/memcpy_64.S: Assembler messages:
bench/../../../arch/x86/lib/memcpy_64.S:28: Error: bad register name `%rdi'
bench/../../../arch/x86/lib/memcpy_64.S:33: Error: invalid instruction 
suffix for `movs'

ARCH=x86 make works fine

thanks,
riccardo
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