From dab01c597f6bd40e0efe7da967b8374ca1971b79 Mon Sep 17 00:00:00 2001
From: David Stevens <stevensd@google.com>
Date: Fri, 24 Apr 2026 12:14:54 -0700
Subject: [PATCH] x86/entry/fred: Encode frame pointer on entry

Add missing ENCODE_FRAME_POINTER macro invocation into FRED_ENTER macro,
to prevent the unwinder from encountering a NULL stack frame pointer
when CONFIG_UNWINDER_FRAME_POINTER is enabled

Fixes: 14619d912b65 ("x86/fred: FRED entry/exit and dispatch code")
Signed-off-by: David Stevens <stevensd@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Link: https://patch.msgid.link/20260424191456.2679717-12-stevensd@google.com
---
 arch/x86/entry/entry_64_fred.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/entry/entry_64_fred.S b/arch/x86/entry/entry_64_fred.S
index 0d2768ab836c..b98f8945dfff 100644
--- a/arch/x86/entry/entry_64_fred.S
+++ b/arch/x86/entry/entry_64_fred.S
@@ -7,6 +7,7 @@
 #include <linux/kvm_types.h>
 
 #include <asm/asm.h>
+#include <asm/frame.h>
 #include <asm/fred.h>
 #include <asm/segment.h>
 
@@ -19,6 +20,7 @@
 	UNWIND_HINT_END_OF_STACK
 	ANNOTATE_NOENDBR
 	PUSH_AND_CLEAR_REGS
+	ENCODE_FRAME_POINTER
 	movq	%rsp, %rdi	/* %rdi -> pt_regs */
 .endm