[PATCH] x86/ptrace: Add comments to x86_regset about empty slots

[Yu-cheng Yu]

find_regset() goes through regsets sequentially.  Empty slots
in regset arrays causes mismatch.  Add comments to x86_regset
enum.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
---
 arch/x86/kernel/ptrace.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index e2ee403865eb..130ca4f27a17 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -42,6 +42,11 @@
 
 #include "tls.h"
 
+/*
+ * find_regset() goes through regsets sequentially.
+ * Do not create empty slots in x86_64_regsets[] or
+ * x86_32_regsets[] below.
+ */
 enum x86_regset {
 	REGSET_GENERAL,
 	REGSET_FP,
-- 
2.17.1