[PATCH 6/9][v5] powerpc/perf: Define big-endian version of perf_mem_data_src
sukadev at linux.vnet.ibm.com
Thu Oct 3 16:20:14 EST 2013
Michael Ellerman [michael at ellerman.id.au] wrote:
| On Tue, Oct 01, 2013 at 05:15:07PM -0700, Sukadev Bhattiprolu wrote:
| > perf_mem_data_src is an union that is initialized via the ->val field
| > and accessed via the bitmap fields. For this to work on big endian
| > platforms, we also need a big-endian represenation of perf_mem_data_src.
| > diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
| > index ca1d90b..846f399 100644
| > --- a/include/uapi/linux/perf_event.h
| > +++ b/include/uapi/linux/perf_event.h
| > @@ -19,6 +19,50 @@
| > #include <asm/byteorder.h>
| > /*
| > + * Kernel and userspace check for endianness in incompatible ways.
| > + * In user space, <endian.h> defines both __BIG_ENDIAN and __LITTLE_ENDIAN
| > + * but sets __BYTE_ORDER to one or the other. So user space uses checks are:
| Why can't you use __BIG_ENDIAN_BITFIELD ?
That macro is not available when building the perf tool - bc there is
a util/include/asm/byterorder.h which gets included instead of the
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