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trace: add variant without spacing in trace_print_hex_seq 

For upcoming tracepoint support for BPF, we want to dump the program's
tag. Format should be similar to __print_hex(), but without spacing.
Add a __print_hex_str() variant for exactly that purpose that reuses
trace_print_hex_seq().

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Daniel Borkmann 2017-01-25 02:28:16 +01:00 committed by David S. Miller
parent 60b1af3300
commit 2acae0d5b0
3 changed files with 13 additions and 5 deletions
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3
include/linux/trace_events.h
View File

@ -33,7 +33,8 @@ const char *trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
unsigned int bitmask_size);
const char *trace_print_hex_seq(struct trace_seq *p,
const unsigned char *buf, int len);
const unsigned char *buf, int len,
bool spacing);
const char *trace_print_array_seq(struct trace_seq *p,
const void *buf, int count,

8
include/trace/trace_events.h
View File

@ -297,7 +297,12 @@ TRACE_MAKE_SYSTEM_STR();
#endif
#undef __print_hex
#define __print_hex(buf, buf_len) trace_print_hex_seq(p, buf, buf_len)
#define __print_hex(buf, buf_len) \
trace_print_hex_seq(p, buf, buf_len, true)
#undef __print_hex_str
#define __print_hex_str(buf, buf_len) \
trace_print_hex_seq(p, buf, buf_len, false)
#undef __print_array
#define __print_array(array, count, el_size) \
@ -711,6 +716,7 @@ static inline void ftrace_test_probe_##call(void) \
#undef __print_flags
#undef __print_symbolic
#undef __print_hex
#undef __print_hex_str
#undef __get_dynamic_array
#undef __get_dynamic_array_len
#undef __get_str

7
kernel/trace/trace_output.c
View File

@ -163,14 +163,15 @@ trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
const char *
trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
bool spacing)
{
int i;
const char *ret = trace_seq_buffer_ptr(p);
for (i = 0; i < buf_len; i++)
trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
trace_seq_printf(p, "%s%2.2x", !spacing || i == 0 ? "" : " ",
buf[i]);
trace_seq_putc(p, 0);
return ret;