no 32-bit support on LE powerpc64le

[than]

Hello all,

we have a problem to build kernel-4.0 on ppc64le. The real problem is 
that there's no 32 bit code generator support in gcc on the ppc64le.
So the option NO_PERF_READ_VDSO32 should be set to 1 on ppc64le.

I have create a patch which fixes the issue for me.

diff -Nur linux-4.0/tools/perf/config/Makefile.than linux-4.0/tools/perf/config/Makefile
--- linux-4.0/tools/perf/config/Makefile.than   2015-06-02 11:58:17.525763988 +0200
+++ linux-4.0/tools/perf/config/Makefile        2015-06-02 12:31:04.898865043 +0200
@@ -642,6 +642,9 @@
     CFLAGS += -DHAVE_KVM_STAT_SUPPORT
 endif
 
+ifeq ($(ARCH),ppc64le)
+  NO_PERF_READ_VDSO32 := 1
+endif
 ifeq (${IS_64_BIT}, 1)
   ifndef NO_PERF_READ_VDSO32
     $(call feature_check,compile-32)


For more infos please take a look at 
https://bugzilla.redhat.com/show_bug.cgi?id=1227260

Thanks,

Best Regards,
Than
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