linux-kernel - Re: [PATCH 6/9][v5] powerpc/perf: Define big-endian version of perf_mem_data

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Date:	Thu, 3 Oct 2013 15:39:44 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Michael Ellerman <michaele@....ibm.com>,
	linux-kernel@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>, linuxppc-dev@...abs.org,
	Paul Mackerras <paulus@...ba.org>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Subject: Re: [PATCH 6/9][v5] powerpc/perf: Define big-endian version of
 perf_mem_data_src

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 ?

cheers
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