linux-kernel - Re: [PATCH 5/5] perf test: squelch warnings about undefined sizeof

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Date:	Tue, 18 Mar 2014 12:40:23 -0400
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 5/5] perf test: squelch warnings about undefined sizeof

Jiri Olsa wrote:
>> > Squelch the warnings by explicitly ignoring the sizeof function.
>>
>> It just hides the warning leaving the real problem untouched.  If you
>> really don't want to see those, I guess installing proper plugin for the
>> failing events will help you (in case you didn't).
>
> it wont' help, sizeof is special.. AFAIK we did not figure
> out a way to handle that so far
>
> but I think it was used only in one trace subsystem.. maybe we
> could replace it and forbid to use it in future ;-)

It only seems to be used by xen:

  Warning: [xen:xen_mmu_set_pte] function sizeof not defined
  Warning: [xen:xen_mmu_set_pte_atomic] function sizeof not defined
  Warning: [xen:xen_mmu_set_domain_pte] function sizeof not defined
  Warning: [xen:xen_mmu_set_pte_at] function sizeof not defined
  Warning: [xen:xen_mmu_set_pmd] function sizeof not defined
  Warning: [xen:xen_mmu_set_pud] function sizeof not defined
  Warning: [xen:xen_mmu_set_pgd] function sizeof not defined
  Warning: [xen:xen_mmu_ptep_modify_prot_start] function sizeof not defined
  Warning: [xen:xen_mmu_ptep_modify_prot_commit] function sizeof not defined

These events are defined in include/trace/events/xen.h. Any hints on
how to proceed?
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