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authorSteven Rostedt <srostedt@redhat.com>2009-05-20 19:21:47 -0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-05-26 20:31:50 +0200
commit0f4fc29dd68dfab9c6ddd5d087d34a5b6818cb00 (patch)
treeaf3d210c8db9adcf117580c949fb708badcb520b /kernel/trace/trace_output.c
parent62ba180e80f4194a498585ac0e4c07daa8ca08d1 (diff)
downloadlinux-0f4fc29dd68dfab9c6ddd5d087d34a5b6818cb00.tar.bz2
tracing: add __print_symbolic to trace events
This patch adds __print_symbolic which is similar to __print_flags but works for an enumeration type instead. That is, there is only a one to one mapping between the values and the symbols. When a match is made, then it is printed, otherwise the hex value is outputed. [ Impact: add interface for showing symbol names in events ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'kernel/trace/trace_output.c')
-rw-r--r--kernel/trace/trace_output.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index a4840c260c89..c12d95db2f56 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -251,6 +251,31 @@ ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
return p->buffer;
}
+const char *
+ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
+ const struct trace_print_flags *symbol_array)
+{
+ int i;
+
+ trace_seq_init(p);
+
+ 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 (!p->len)
+ trace_seq_printf(p, "0x%lx", val);
+
+ trace_seq_putc(p, 0);
+
+ return p->buffer;
+}
+
#ifdef CONFIG_KRETPROBES
static inline const char *kretprobed(const char *name)
{