linux-kernel - Re: [PATCH] perf tool: fix endianness handling of u32 data in samples

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Message-ID: <20110902200255.GG17970@ghostprotocols.net>
Date:	Fri, 2 Sep 2011 17:02:55 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, peterz@...radead.org, fweisbec@...il.com,
	paulus@...ba.org, tglx@...utronix.de, anton@...ba.org
Subject: Re: [PATCH] perf tool: fix endianness handling of u32 data in samples

Em Fri, Sep 02, 2011 at 01:41:51PM -0600, David Ahern escreveu:
> @@ -423,18 +449,25 @@ int perf_event__parse_sample(const union perf_event *event, u64 type,
>  	}
>  
>  	if (type & PERF_SAMPLE_RAW) {
> -		u32 *p = (u32 *)array;
> +		u.val64 = *array;
> +		if (swapped) {
> +			/* undo swap of u64, then swap on individual u32s */
> +			u.val64 = bswap_64(u.val64);
> +			u.val32[0] = bswap_32(u.val32[0]);
> +			u.val32[1] = bswap_32(u.val32[1]);
> +
> +			WARN_ONCE(swapped, "Endianness of raw data not corrected!\n");
> +		}

That works too, but then we'll be always testing swapped two times :-)

- Arnaldo
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