linux-kernel - Re: [PATCH] perf: Align cpu map events properly.

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Message-ID: <20181016152925.GD3849@kernel.org>
Date:   Tue, 16 Oct 2018 12:29:25 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     David Miller <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: Align cpu map events properly.

Em Thu, Oct 11, 2018 at 10:46:55PM -0700, David Miller escreveu:
> The size of the resulting cpu map can be smaller than a multiple
> of sizeof(u64), resulting in SIGBUS on cpus like Sparc as the
> next event will not be aligned properly.
> 
> Fixes: 6c872901af07 ("perf cpu_map: Add cpu_map event synthesize function")
> Signed-off-by: David S. Miller <davem@...emloft.net>

Thanks, applied to perf/urgent.

- Arnaldo
 
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index 0cd42150f712..0988eb3b844b 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -1081,6 +1081,7 @@ void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max
>  	}
>  
>  	*size += sizeof(struct cpu_map_data);
> +	*size = PERF_ALIGN(*size, sizeof(u64));
>  	return zalloc(*size);
>  }
>