[PATCH 4.14 039/183] tools lib traceevent: Simplify pointer print logic and fix %pF

From: Greg Kroah-Hartman
Date: Wed Apr 25 2018 - 07:28:50 EST


4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>


[ Upstream commit 38d70b7ca1769f26c0b79f3c08ff2cc949712b59 ]

When processing %pX in pretty_print(), simplify the logic slightly by
incrementing the ptr to the format string if isalnum(ptr[1]) is true.
This follows the logic a bit more closely to what is in the kernel.

Also, this fixes a small bug where %pF was not giving the offset of the
function.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20180112004822.260262257@xxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/lib/traceevent/event-parse.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)

--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -4949,21 +4949,22 @@ static void pretty_print(struct trace_se
else
ls = 2;

- if (*(ptr+1) == 'F' || *(ptr+1) == 'f' ||
- *(ptr+1) == 'S' || *(ptr+1) == 's') {
+ if (isalnum(ptr[1]))
ptr++;
+
+ if (*ptr == 'F' || *ptr == 'f' ||
+ *ptr == 'S' || *ptr == 's') {
show_func = *ptr;
- } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
- print_mac_arg(s, *(ptr+1), data, size, event, arg);
- ptr++;
+ } else if (*ptr == 'M' || *ptr == 'm') {
+ print_mac_arg(s, *ptr, data, size, event, arg);
arg = arg->next;
break;
- } else if (*(ptr+1) == 'I' || *(ptr+1) == 'i') {
+ } else if (*ptr == 'I' || *ptr == 'i') {
int n;

- n = print_ip_arg(s, ptr+1, data, size, event, arg);
+ n = print_ip_arg(s, ptr, data, size, event, arg);
if (n > 0) {
- ptr += n;
+ ptr += n - 1;
arg = arg->next;
break;
}