From faec2ec505d397e9426754722b6e80d519c4938f Mon Sep 17 00:00:00 2001 From: Liming Wang Date: Thu, 4 Dec 2008 14:24:49 +0800 Subject: [PATCH] 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 Signed-off-by: Ingo Molnar --- kernel/trace/ftrace.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index eb57dc1ea097..d2b156538162 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -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; } } -- 2.20.1