Re: [PATCH 6/9][v5] powerpc/perf: Define big-endian version of perf_mem_data_src
From: Michael Ellerman <hidden>
Date: 2013-10-03 05:39:48
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On Tue, Oct 01, 2013 at 05:15:07PM -0700, Sukadev Bhattiprolu wrote:
quoted hunk ↗ jump to hunk
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 ? cheers