linux-kernel - [PATCH v3 4/7] x86/tls: create an explicit config symbol for the TLS area in the GDT

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Date:   Thu, 21 Jun 2018 14:17:51 -0700
From:   "H. Peter Anvin, Intel" <h.peter.anvin@...el.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     "H. Peter Anvin" <hpa@...ux.intel.com>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        "Chang S . Bae" <chang.seok.bae@...el.com>,
        "Markus T . Metzger" <markus.t.metzger@...el.com>
Subject: [PATCH v3 4/7] x86/tls: create an explicit config symbol for the TLS area in the GDT

From: "H. Peter Anvin" <hpa@...ux.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@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Chang S. Bae <chang.seok.bae@...el.com>
Cc: Markus T. Metzger <markus.t.metzger@...el.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