linux-kernel - Re: [tip:perfcounters/core] perf_counter tools: Introduce stricter C code checking

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Message-ID: <18974.2897.822557.905261@drongo.ozlabs.ibm.com>
Date:	Thu, 28 May 2009 13:56:01 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	mingo@...hat.com, hpa@...or.com, acme@...hat.com,
	linux-kernel@...r.kernel.org, jkacur@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, rostedt@...dmis.org,
	mtosatti@...hat.com, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf_counter tools: Introduce stricter C code checking

tip-bot for Ingo Molnar writes:

> perf_counter tools: Introduce stricter C code checking
> 
> Tighten up our C code requirements:
> 
>  - disallow warnings

This causes failures when I compile it as a 64-bit executable on
powerpc:

    CC builtin-record.o
builtin-record.c: In function 'pid_synthesize_mmap_events':
builtin-record.c:241: warning: format '%llx' expects type 'long long unsigned int *', but argument 3 has type '__u64 *'
builtin-record.c:241: warning: format '%llx' expects type 'long long unsigned int *', but argument 4 has type '__u64 *'
builtin-record.c:241: warning: format '%llx' expects type 'long long unsigned int *', but argument 9 has type '__u64 *'

This is because u64 is an unsigned long in userspace for a 64-bit
build, not unsigned long long.  I'm not sure how best to solve this
problem.

If I compile it as a 32-bit executable, it doesn't generate warnings,
but when I try to run "perf top" (this is on a 64-bit kernel, of
course, since 32-bit powerpc kernels don't currently support
perf_counters), I get:

# perf top
 left: 0000000000000000
   ip: 00000000000891a4
right: 00000000ffffffff
KernelTop refresh period: 2 seconds
perf: builtin-top.c:453: record_ip: Assertion `left <= ip && ip <= right' failed.
Aborted

Paul.
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