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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: a2abe7cbd8
("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>
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@ -681,6 +681,7 @@ config SHADOW_CALL_STACK
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bool "Shadow Call Stack"
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depends on ARCH_SUPPORTS_SHADOW_CALL_STACK
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depends on DYNAMIC_FTRACE_WITH_ARGS || DYNAMIC_FTRACE_WITH_REGS || !FUNCTION_GRAPH_TRACER
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depends on MMU
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help
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This option enables the compiler's Shadow Call Stack, which
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uses a shadow stack to protect function return addresses from
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