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-rw-r--r--drivers/oprofile/cpu_buffer.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 0ac8b06..219f79e 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -319,8 +319,16 @@ void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
{
- int is_kernel = !user_mode(regs);
- unsigned long pc = profile_pc(regs);
+ int is_kernel;
+ unsigned long pc;
+
+ if (likely(regs)) {
+ is_kernel = !user_mode(regs);
+ pc = profile_pc(regs);
+ } else {
+ is_kernel = 0; /* This value will not be used */
+ pc = ESCAPE_CODE; /* as this causes an early return. */
+ }
__oprofile_add_ext_sample(pc, regs, event, is_kernel);
}