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

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Date:	Tue, 07 Oct 2014 18:53:19 -0600
From:	David Ahern <dsahern@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	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, 6:50 PM, Andi Kleen wrote:
> David Ahern <dsahern@...il.com> writes:
>>>
>>> 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 *)
>
> The right way is to add a compat_perf_ioctl()

Sure, looked into that way as well. But SET_FILTER and IOC_ID will still 
compile to the same values for a 64-bit kernel.

David

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