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    Subject[PATCH v3 4/7] x86/tls: create an explicit config symbol for the TLS area in the GDT
    Date
    From: "H. Peter Anvin" <hpa@linux.intel.com>

    Instead of using X86_32 || IA32_EMULATION, which is really rather ugly
    in the Makefile especially, create a dedicated config symbol for the
    TLS area. This will be further used in subsequent patches.

    Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Chang S. Bae <chang.seok.bae@intel.com>
    Cc: Markus T. Metzger <markus.t.metzger@intel.com>
    ---
    arch/x86/Kconfig | 4 ++++
    arch/x86/kernel/Makefile | 3 +--
    2 files changed, 5 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index f1dbb4ee19d7..e48036e3f158 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -2937,6 +2937,10 @@ config X86_DMA_REMAP
    config HAVE_GENERIC_GUP
    def_bool y

    +config X86_TLS_AREA
    + def_bool y
    + depends on IA32_EMULATION || X86_32
    +
    source "net/Kconfig"

    source "drivers/Kconfig"
    diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
    index 02d6f5cf4e70..d26ef8a40a88 100644
    --- a/arch/x86/kernel/Makefile
    +++ b/arch/x86/kernel/Makefile
    @@ -65,8 +65,7 @@ obj-y += resource.o
    obj-y += process.o
    obj-y += fpu/
    obj-y += ptrace.o
    -obj-$(CONFIG_X86_32) += tls.o
    -obj-$(CONFIG_IA32_EMULATION) += tls.o
    +obj-$(CONFIG_X86_TLS_AREA) += tls.o
    obj-y += step.o
    obj-$(CONFIG_INTEL_TXT) += tboot.o
    obj-$(CONFIG_ISA_DMA_API) += i8237.o
    --
    2.14.4
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