1 files changed, 3 insertions, 0 deletions

diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index 1e45ff292bc9..3c73dc865ead 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -245,6 +245,9 @@ syscall_exit:
 
 restore_all:
         movl EFLAGS(%esp), %eax         # mix EFLAGS, SS and CS
+        # Warning: OLDSS(%esp) contains the wrong/random values if we
+        # are returning to the kernel.
+        # See comments in process.c:copy_thread() for details.
         movb OLDSS(%esp), %ah
         movb CS(%esp), %al
         andl $(VM_MASK | (4 << 8) | 3), %eax