From cd459beede7b5d1168d664c2d921aa15a4531666 Mon Sep 17 00:00:00 2001
From: Samuel Holland <samuel.holland@sifive.com>
Date: Mon, 22 Jan 2024 09:52:01 -0800
Subject: [PATCH] scs: add CONFIG_MMU dependency for vfree_atomic()

commit 6f9dc684cae638dda0570154509884ee78d0f75c upstream.

The shadow call stack implementation fails to build without CONFIG_MMU:

  ld.lld: error: undefined symbol: vfree_atomic
  >>> referenced by scs.c
  >>>               kernel/scs.o:(scs_free) in archive vmlinux.a

Link: https://lkml.kernel.org/r/20240122175204.2371009-1-samuel.holland@sifive.com
Fixes: a2abe7cbd8fe ("scs: switch to vmapped shadow stacks")
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index b45c699c2bac..2e2dc0975ab4 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -605,6 +605,7 @@ config SHADOW_CALL_STACK
 	bool "Clang Shadow Call Stack"
 	depends on CC_IS_CLANG && ARCH_SUPPORTS_SHADOW_CALL_STACK
 	depends on DYNAMIC_FTRACE_WITH_REGS || !FUNCTION_GRAPH_TRACER
+	depends on MMU
 	help
 	  This option enables Clang's Shadow Call Stack, which uses a
 	  shadow stack to protect function return addresses from being