On Fri, 13 Dec 2013 17:04:14 +0000 David Howells <[email protected]> wrote:
> Steven Rostedt <[email protected]> wrote: > > > > Would it be possible to print this as a string rather than a number? > > > The protocol numbers are completely arbitrary, so the reader would have > > > to open i2c.h each time to figure out what is what. > > > > That can be done in the TP_printk() with: > > > > ".. %s ..", .., > > __print_symbolic(__entry->protocol, > > { I2C_SMBUS_QUICK , "QUICK" }, > > { I2C_SMBUS_BYTE , "BYTE" }, > > { I2C_SMBUS_BYTE_DATA , "BYTE_DATA" }, > > [...] > > { I2C_SMBUS_I2C_BLOCK_DATA, "I2C_BLOCK_DATA"}), ... > > What happens if the number isn't in the table? It simply prints the hex value. See trace_output.c: const char * ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, const struct trace_print_flags *symbol_array) { int i; const char *ret = p->buffer + p->len; for (i = 0; symbol_array[i].name; i++) { if (val != symbol_array[i].mask) continue; trace_seq_puts(p, symbol_array[i].name); break; } if (ret == (const char *)(p->buffer + p->len)) trace_seq_printf(p, "0x%lx", val); trace_seq_putc(p, 0); return ret; } -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
