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tracing: Have syscall trace events show "0x" for values greater than 10

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Currently the syscall trace events show each value as hexadecimal, but
without adding "0x" it can be confusing:

   sys_write(fd: 4, buf: 0x55c4a1fa9270, count: 44)

Looks like the above write wrote 44 bytes, when in reality it wrote 68
bytes.

Add a "0x" for all values greater or equal to 10 to remove the ambiguity.
For values less than 10, leave off the "0x" as that just adds noise to the
output.

Also change the iterator to check if "i" is nonzero and print the ", "
delimiter at the start, then adding the logic to the trace_seq_printf() at
the end.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Takaya Saeki <takayas@google.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ian Rogers <irogers@google.com>
Cc: Douglas Raillard <douglas.raillard@arm.com>
Link: https://lore.kernel.org/20250923130713.764558957@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt
2025-09-23 09:04:59 -04:00
committed by Steven Rostedt (Google)
parent 17a1a107d0
commit 3add2d34bd
1 changed files with 9 additions and 3 deletions
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12
kernel/trace/trace_syscalls.c
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@@ -153,14 +153,20 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
if (trace_seq_has_overflowed(s))
goto end;
if (i)
trace_seq_puts(s, ", ");
/* parameter types */
if (tr && tr->trace_flags & TRACE_ITER_VERBOSE)
trace_seq_printf(s, "%s ", entry->types[i]);
/* parameter values */
trace_seq_printf(s, "%s: %lx%s", entry->args[i],
trace->args[i],
i == entry->nb_args - 1 ? "" : ", ");
if (trace->args[i] < 10)
trace_seq_printf(s, "%s: %lu", entry->args[i],
trace->args[i]);
else
trace_seq_printf(s, "%s: 0x%lx", entry->args[i],
trace->args[i]);
}
trace_seq_putc(s, ')');