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perf probe-event: Better error message for a too-long probe name

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This is a common failure mode when probing userspace C++ code (where the
mangling adds significant length to the symbol names).

Prior to this patch, only a very generic error message is produced,
making the user guess at what the issue is.

Signed-off-by: Dima Kogan <dima@secretsauce.net>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20240416045533.162692-3-dima@secretsauce.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Dima Kogan 2024-04-15 21:55:11 -07:00 committed by Arnaldo Carvalho de Melo
parent a529bec023
commit c15ed44429
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/probe-event.c
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@ -2758,7 +2758,7 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
/* Try no suffix number */
ret = e_snprintf(buf, len, "%s%s", nbase, ret_event ? "__return" : "");
if (ret < 0) {
pr_debug("snprintf() failed: %d\n", ret);
pr_warning("snprintf() failed: %d; the event name nbase='%s' is too long\n", ret, nbase);
goto out;
}
if (!strlist__has_entry(namelist, buf))