perf probe: Set retprobe flag when probe in address-based alternative mode
When perf probe searched in a debuginfo file and failed, it tried with an alternative, in function get_alternative_probe_event(): memcpy(tmp, &pev->point, sizeof(*tmp)); memset(&pev->point, 0, sizeof(pev->point)); In this case, it drops the retprobe flag and forgets to set it back in find_alternative_probe_point(), so the problem occurs. Can be reproduced as following: $ perf probe -v -k vmlinux --add='sys_write%return' ... Added new event: Writing event: p:probe/sys_write _stext+1584952 probe:sys_write (on sys_write%return) $ cat /sys/kernel/debug/tracing/kprobe_events p:probe/sys_write _stext+1584952 After this patch: $ perf probe -v -k vmlinux --add='sys_write%return' Added new event: Writing event: r:probe/sys_write SyS_write+0 probe:sys_write (on sys_write%return) $ cat /sys/kernel/debug/tracing/kprobe_events r:probe/sys_write SyS_write Signed-off-by: NHe Kuang <hekuang@huawei.com> Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com> Acked-by: NMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1428925290-5623-1-git-send-email-hekuang@huawei.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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