The patch titled
Subject: scs: add CONFIG_MMU dependency for vfree_atomic()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
scs-add-config_mmu-dependency-for-vfree_atomic.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scs-add-config_mmu-dependency-for-vfree_atomic.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Samuel Holland <samuel.holland@xxxxxxxxxx>
Subject: scs: add CONFIG_MMU dependency for vfree_atomic()
Date: Mon, 22 Jan 2024 09:52:01 -0800
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@xxxxxxxxxx
Fixes: a2abe7cbd8fe ("scs: switch to vmapped shadow stacks")
Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
Reviewed-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/Kconfig | 1 +
1 file changed, 1 insertion(+)
--- a/arch/Kconfig~scs-add-config_mmu-dependency-for-vfree_atomic
+++ a/arch/Kconfig
@@ -668,6 +668,7 @@ config SHADOW_CALL_STACK
bool "Shadow Call Stack"
depends on ARCH_SUPPORTS_SHADOW_CALL_STACK
depends on DYNAMIC_FTRACE_WITH_ARGS || DYNAMIC_FTRACE_WITH_REGS || !FUNCTION_GRAPH_TRACER
+ depends on MMU
help
This option enables the compiler's Shadow Call Stack, which
uses a shadow stack to protect function return addresses from
_
Patches currently in -mm which might be from samuel.holland@xxxxxxxxxx are
scs-add-config_mmu-dependency-for-vfree_atomic.patch
