linux-kernel - Re: PERF_EVENT_IOC_SET_FILTER has different values based on bitness

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Message-ID: <5434749D.9070301@gmail.com>
Date:	Tue, 07 Oct 2014 17:17:49 -0600
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...nel.org>
Subject: Re: PERF_EVENT_IOC_SET_FILTER has different values based on bitness

On 10/7/14, 5:07 PM, David Ahern wrote:
>
> 32-bit perf binaries are not able to set filters on 64-bit kernels.
>
>     $ perf record -e  net:netif_receive_skb --filter 'name == "eth1"
>     Error: failed to set filter with 25 (Inappropriate ioctl for device)
>
> The reason is that the definition of PERF_EVENT_IOC_SET_FILTER contains
> a pointer:
>
> #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
>
> the size of which of course differs for 32-bit and 64-bit. This has been
> there since the original commit (6fb2915df7f07) back in 2009.
>
> Thoughts on how to fix this? Changing the definition of SET_FILTER
> breaks existing setups so that rules it out. What about something like
> this:
>
> #define PERF_EVENT_IOC_SET_FILTER_32       _IOW('$', 6, u32)
>
> and then
>
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 963bf139e2b2..c805132ac1cf 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -3714,6 +3714,7 @@ static long perf_ioctl(struct file *file, unsigned
> int cmd, unsigned long arg)
>      }
>
>      case PERF_EVENT_IOC_SET_FILTER:
> +   case PERF_EVENT_IOC_SET_FILTER_32:
>          return perf_event_set_filter(event, (void __user *)arg);
>
>      default:
>

Oh, PERF_EVENT_IOC_ID has the same problem:

#define PERF_EVENT_IOC_ID               _IOR('$', 7, __u64 *)

David

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