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Subject[PATCH 08/40] perf trace: Allow specifying number of syscall args for tracepointless syscalls
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

When we don't have syscalls:sys_{enter,exit}_NAME, we had to resort to
dumping all the 6 syscall arguments, fix it by providing that info for
such syscalls, like 'clone'.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-dfq1jtrxj8dqvqoeqqpr3slu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-trace.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index f8b7bfdf4ee7..e1988d08911d 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -611,6 +611,7 @@ static struct syscall_fmt {
const char *name;
const char *alias;
struct syscall_arg_fmt arg[6];
+ u8 nr_args;
bool errpid;
bool timeout;
bool hexret;
@@ -1169,6 +1170,9 @@ static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
{
int idx;

+ if (nr_args == 6 && sc->fmt && sc->fmt->nr_args != 0)
+ nr_args = sc->fmt->nr_args;
+
sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));
if (sc->arg_fmt == NULL)
return -1;
@@ -1413,7 +1417,7 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
* may end up not having any args, like with gettid(), so only
* print the raw args when we didn't manage to read it.
*/
- while (arg.idx < 6) {
+ while (arg.idx < sc->nr_args) {
if (arg.mask & bit)
goto next_arg;
val = syscall_arg__val(&arg, arg.idx);
--
2.9.4
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