linux-kernel - [PATCH 3.12 023/104] x86, espfix: Make espfix64 a Kconfig option, fix UML

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Message-Id: <9217746a13b46bf0da738c0bacdb77b0db288137.1408535000.git.jslaby@suse.cz>
Date:	Wed, 20 Aug 2014 13:42:46 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Richard Weinberger <richard@....at>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 023/104] x86, espfix: Make espfix64 a Kconfig option, fix UML

From: "H. Peter Anvin" <hpa@...or.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 197725de65477bc8509b41388157c1a2283542bb upstream.

Make espfix64 a hidden Kconfig option.  This fixes the x86-64 UML
build which had broken due to the non-existence of init_espfix_bsp()
in UML: since UML uses its own Kconfig, this option does not appear in
the UML build.

This also makes it possible to make support for 16-bit segments a
configuration option, for the people who want to minimize the size of
the kernel.

Reported-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Cc: Richard Weinberger <richard@....at>
Link: http://lkml.kernel.org/r/1398816946-3351-1-git-send-email-hpa@linux.intel.com
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/x86/Kconfig          | 4 ++++
 arch/x86/kernel/Makefile  | 2 +-
 arch/x86/kernel/smpboot.c | 2 +-
 init/main.c               | 2 +-
 4 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9dc1a24d41b8..b423c245595f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -978,6 +978,10 @@ config VM86
 	  XFree86 to initialize some video cards via BIOS. Disabling this
 	  option saves about 6k.
 
+config X86_ESPFIX64
+	def_bool y
+	depends on X86_64
+
 config TOSHIBA
 	tristate "Toshiba Laptop support"
 	depends on X86_32
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index d5c94c90716b..32f114091e97 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -29,7 +29,7 @@ obj-$(CONFIG_X86_64)	+= sys_x86_64.o x8664_ksyms_64.o
 obj-y			+= syscall_$(BITS).o
 obj-$(CONFIG_X86_64)	+= vsyscall_64.o
 obj-$(CONFIG_X86_64)	+= vsyscall_emu_64.o
-obj-$(CONFIG_X86_64)	+= espfix_64.o
+obj-$(CONFIG_X86_ESPFIX64)	+= espfix_64.o
 obj-y			+= bootflag.o e820.o
 obj-y			+= pci-dma.o quirks.o topology.o kdebugfs.o
 obj-y			+= alternative.o i8253.o pci-nommu.o hw_breakpoint.o
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index a7340d7d6d06..42c26a485533 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -267,7 +267,7 @@ static void notrace start_secondary(void *unused)
 	/*
 	 * Enable the espfix hack for this CPU
 	 */
-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X86_ESPFIX64
 	init_espfix_ap();
 #endif
 
diff --git a/init/main.c b/init/main.c
index 8e35b39b5a80..181221865266 100644
--- a/init/main.c
+++ b/init/main.c
@@ -610,7 +610,7 @@ asmlinkage void __init start_kernel(void)
 	if (efi_enabled(EFI_RUNTIME_SERVICES))
 		efi_enter_virtual_mode();
 #endif
-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X86_ESPFIX64
 	/* Should be run before the first non-init thread is created */
 	init_espfix_bsp();
 #endif
-- 
2.0.4

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