perf: Fix endianness argument compatibility with OPT_BOOLEAN() and introduce OPT_INCR()

Parsing an option from the command line with OPT_BOOLEAN on a
bool data type would not work on a big-endian machine due to the
manner in which the boolean was being cast into an int and
incremented. For example, running 'perf probe --list' on a
PowerPC machine would fail to properly set the list_events bool
and would therefore print out the usage information and
terminate.

This patch makes OPT_BOOLEAN work as expected with a bool
datatype. For cases where the original OPT_BOOLEAN was
intentionally being used to increment an int each time it was
passed in on the command line, this patch introduces OPT_INCR
with the old behaviour of OPT_BOOLEAN (the verbose variable is
currently the only such example of this).

I have reviewed every use of OPT_BOOLEAN to verify that a true
C99 bool was passed. Where integers were used, I verified that
they were only being used for boolean logic and changed them to
bools to ensure that they would not be mistakenly used as ints.
The major exception was the verbose variable which now uses
OPT_INCR instead of OPT_BOOLEAN.

Signed-off-by: Ian Munsie <imunsie@au.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: <stable@kernel.org> # NOTE: wont apply to .3[34].x cleanly, please backport
Cc: Git development list <git@vger.kernel.org>
Cc: Ian Munsie <imunsie@au1.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Eric B Munson <ebmunson@us.ibm.com>
Cc: Valdis.Kletnieks@vt.edu
Cc: WANG Cong <amwang@redhat.com>
Cc: Thiago Farina <tfransosi@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: John Kacur <jkacur@redhat.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1271147857-11604-1-git-send-email-imunsie@au.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 7 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 4abdd9b646b3..40f24dd46ef4 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -57,7 +57,7 @@
 
 static int                      *fd[MAX_NR_CPUS][MAX_COUNTERS];
 
-static int                      system_wide                     =      0;
+static bool                     system_wide                     =  false;
 
 static int                      default_interval                =      0;
 
@@ -68,18 +68,18 @@ static int			target_pid			=     -1;
 static int                      target_tid                      =     -1;
 static pid_t                    *all_tids                       =      NULL;
 static int                      thread_num                      =      0;
-static int                      inherit                         =      0;
+static bool                     inherit                         =  false;
 static int                      profile_cpu                     =     -1;
 static int                      nr_cpus                         =      0;
 static unsigned int             realtime_prio                   =      0;
-static int                      group                           =      0;
+static bool                     group                           =  false;
 static unsigned int             page_size;
 static unsigned int             mmap_pages                      =     16;
 static int                      freq                            =   1000; /* 1 KHz */
 
 static int                      delay_secs                      =      2;
-static int                      zero                            =      0;
-static int                      dump_symtab                     =      0;
+static bool                     zero                            =  false;
+static bool                     dump_symtab                     =  false;
 
 static bool                     hide_kernel_symbols             =  false;
 static bool                     hide_user_symbols               =  false;
@@ -854,7 +854,7 @@ static void handle_keypress(int c)
                         display_weighted = ~display_weighted;
                         break;
                 case 'z':
-                        zero = ~zero;
+                        zero = !zero;
                         break;
                 default:
                         break;
@@ -1335,7 +1335,7 @@ static const struct option options[] = {
                     "display this many functions"),
         OPT_BOOLEAN('U', "hide_user_symbols", &hide_user_symbols,
                     "hide user symbols"),
-        OPT_BOOLEAN('v', "verbose", &verbose,
+        OPT_INCR('v', "verbose", &verbose,
                     "be more verbose (show counter open errors, etc)"),
         OPT_END()
 };