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perf bench: fix assert when NDEBUG is defined 

When NDEBUG is defined, the assert macro will be expanded to nothing.
Some assert calls used in perf are also including some functionality
(e.g. system calls), not only validity checks. Therefore, if NDEBUG is
defined, this functionality will be removed along with the assert.  Perf
also defines BUG_ON based on assert, so it has the same problem.

Define BUG_ON so that the condition will be executed when NDEBUG is
defined.  Replace the assert statements that have these side effects
with BUG_ON.

For defining BUG_ON, use "if (cond) {}" insted of "if (cond) ;" because
in the latter case build fails with "error: suggest braces around empty
body in an ‘if’ statement [-Werror=empty-body]"

Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1347082551-2394-1-git-send-email-irina.tirdea@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Irina Tirdea 2012-09-08 08:35:51 +03:00 committed by Arnaldo Carvalho de Melo
parent ef34eb4da3
commit 8bf98b8968
2 changed files with 7 additions and 3 deletions
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6
tools/perf/bench/sched-pipe.c
View File

@ -56,13 +56,13 @@ int bench_sched_pipe(int argc, const char **argv,
* causes error in building environment for perf
*/
int __used ret, wait_stat;
pid_t pid, retpid;
pid_t pid, retpid __used;
argc = parse_options(argc, argv, options,
bench_sched_pipe_usage, 0);
assert(!pipe(pipe_1));
assert(!pipe(pipe_2));
BUG_ON(pipe(pipe_1));
BUG_ON(pipe(pipe_2));
pid = fork();
assert(pid >= 0);

4
tools/perf/util/include/linux/kernel.h
View File

@ -47,8 +47,12 @@
#endif
#ifndef BUG_ON
#ifdef NDEBUG
#define BUG_ON(cond) do { if (cond) {} } while (0)
#else
#define BUG_ON(cond) assert(!(cond))
#endif
#endif
/*
* Both need more care to handle endianness