[PATCH v2] perf test shell: Fix check open filename arg using 'perf trace

[Michael Petlan <mpetlan@redhat.com>]

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Hi Arnaldo, so I have tried what you've suggested and looks good.
Patch is attached. Sorry for not posting it in-text, but I need to
fix my mail client first, since it screwes some patches up due to
flowed-text...
Cheers,
Michael

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commit 92281a9ff73f98d8aca7595504340a25c92b9f1a
Author: Michael Petlan <mpetlan@redhat.com>
Date:   Fri Dec 8 18:43:18 2017 +0100

    perf test shell: Fix check open filename arg using 'perf trace'
    
    The following commit added an exception for s390x to use openat()
    instead of open() in the test:
    
      commit f231af789b11a2f1a3795acc3228a3e178a80c21
      Author: Thomas Richter <tmricht@linux.vnet.ibm.com>
      Date:   Tue Nov 14 08:18:46 2017 +0100
    
    Since the problem is not s390x-specific, this patch makes it more
    generic, so the test handles both open() and openat() no matter
    which architecture it is running on.
    
    Signed-off-by: Michael Petlan <mpetlan@redhat.com>

diff --git a/tools/perf/tests/shell/trace+probe_vfs_getname.sh b/tools/perf/tests/shell/trace+probe_vfs_getname.sh
index 2a9ef08..edd1073 100755
--- a/tools/perf/tests/shell/trace+probe_vfs_getname.sh
+++ b/tools/perf/tests/shell/trace+probe_vfs_getname.sh
@@ -17,10 +17,9 @@ skip_if_no_perf_probe || exit 2
 file=$(mktemp /tmp/temporary_file.XXXXX)
 
 trace_open_vfs_getname() {
-	test "$(uname -m)" = s390x && { svc="openat"; txt="dfd: +CWD, +"; }
-
-	perf trace -e ${svc:-open} touch $file 2>&1 | \
-	egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ ${svc:-open}\(${txt}filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
+	evts=`perf list syscalls:sys_enter_open* |& egrep 'open(at)? ' | sed -r 's/.*sys_enter_(.*) +\[.*/-e \1/'`
+	perf trace $evts touch $file 2>&1 | \
+	egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
 }