From 361da40536d7f6fc6c06d54b261c299d170ccf2f Mon Sep 17 00:00:00 2001
From: Andrew Turner <andrew@FreeBSD.org>
Date: Tue, 4 Jun 2024 13:45:00 +0100
Subject: [PATCH] arm64: Disable outling atomics

We don't have the symbols for this. The virtio randon number driver
uses a C11 atomic operation. With inline atomics this is translated to
an Armv8.0 atomic operation, with outling atomics this becomes a
function call to a handler. As we don't have the needed function the
kernel fails to link.

Fix by disabling outline atomics for now.

Reviewed by:	brooks, imp
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D45301
---
 sys/conf/kern.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index d51aa1f1dfa..106f09d80ac 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -143,6 +143,8 @@ CFLAGS += -mgeneral-regs-only
 CFLAGS += -ffixed-x18
 # Build with BTI+PAC
 CFLAGS += -mbranch-protection=standard
+# TODO: support outline atomics
+CFLAGS += -mno-outline-atomics
 INLINE_LIMIT?=	8000
 .endif