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-rw-r--r--kernel/trace/ftrace.c9
-rw-r--r--kernel/trace/trace_kprobe.c8
2 files changed, 14 insertions, 3 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1ee417f..908038f 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2740,7 +2740,7 @@ static int ftrace_process_regex(struct ftrace_hash *hash,
{
char *func, *command, *next = buff;
struct ftrace_func_command *p;
- int ret;
+ int ret = -EINVAL;
func = strsep(&next, ":");
@@ -3330,6 +3330,7 @@ static int ftrace_process_locs(struct module *mod,
{
unsigned long *p;
unsigned long addr;
+ unsigned long flags;
mutex_lock(&ftrace_lock);
p = start;
@@ -3346,7 +3347,13 @@ static int ftrace_process_locs(struct module *mod,
ftrace_record_ip(addr);
}
+ /*
+ * Disable interrupts to prevent interrupts from executing
+ * code that is being modified.
+ */
+ local_irq_save(flags);
ftrace_update_code(mod);
+ local_irq_restore(flags);
mutex_unlock(&ftrace_lock);
return 0;
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index f925c45..27d13b3 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1870,8 +1870,12 @@ fs_initcall(init_kprobe_trace);
#ifdef CONFIG_FTRACE_STARTUP_TEST
-static int kprobe_trace_selftest_target(int a1, int a2, int a3,
- int a4, int a5, int a6)
+/*
+ * The "__used" keeps gcc from removing the function symbol
+ * from the kallsyms table.
+ */
+static __used int kprobe_trace_selftest_target(int a1, int a2, int a3,
+ int a4, int a5, int a6)
{
return a1 + a2 + a3 + a4 + a5 + a6;
}
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