[PATCH 6/9][v5] powerpc/perf: Define big-endian version of perf_mem_data_src
michael at ellerman.id.au
Thu Oct 3 15:39:44 EST 2013
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 ?
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