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ftrace: avoid duplicated function when writing set_graph_function 

Impact: fix a bug in function filter setting

when writing function to set_graph_function, we should check whether it
has existed in set_graph_function to avoid duplicating.

Signed-off-by: Liming Wang <liming.wang@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Liming Wang 2008-12-04 14:24:49 +08:00 committed by Ingo Molnar
parent 6b2539302b
commit faec2ec505
1 changed files with 8 additions and 2 deletions
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10
kernel/trace/ftrace.c
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@ -1425,7 +1425,7 @@ ftrace_set_func(unsigned long *array, int idx, char *buffer)
struct dyn_ftrace *rec;
struct ftrace_page *pg;
int found = 0;
int i;
int i, j;
if (ftrace_disabled)
return -ENODEV;
@ -1443,7 +1443,13 @@ ftrace_set_func(unsigned long *array, int idx, char *buffer)
kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
if (strcmp(str, buffer) == 0) {
found = 1;
array[idx] = rec->ip;
for (j = 0; j < idx; j++)
if (array[j] == rec->ip) {
found = 0;
break;
}
if (found)
array[idx] = rec->ip;
break;
}
}