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    Subject[PATCH v2 38/59] x86/Kconfig: Add CONFIG_CALL_THUNKS
    From: Thomas Gleixner <tglx@linutronix.de>

    In preparation for mitigating the Intel SKL RSB underflow issue in
    software, add a new configuration symbol which allows to build the
    required call thunk infrastructure conditionally.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    ---
    arch/x86/Kconfig | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -2432,6 +2432,13 @@ config CC_HAS_SLS
    config CC_HAS_RETURN_THUNK
    def_bool $(cc-option,-mfunction-return=thunk-extern)

    +config HAVE_CALL_THUNKS
    + def_bool y
    + depends on RETHUNK && OBJTOOL
    +
    +config CALL_THUNKS
    + def_bool n
    +
    menuconfig SPECULATION_MITIGATIONS
    bool "Mitigations for speculative execution vulnerabilities"
    default y

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