x86, espfix: Make espfix64 a Kconfig option, fix UML
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@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Richard Weinberger <richard@nod.at>
Link: http://lkml.kernel.org/r/1398816946-3351-1-git-send-email-hpa@linux.intel.com
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 25d2c6f..9a952a5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -914,6 +914,10 @@
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 1cc3789..491ef3e 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -29,7 +29,7 @@
obj-y += syscall_$(BITS).o vsyscall_gtod.o
obj-$(CONFIG_X86_64) += vsyscall_64.o
obj-$(CONFIG_X86_64) += vsyscall_emu_64.o
-obj-$(CONFIG_X86_64) += espfix_64.o
+obj-$(CONFIG_X86_ESPFIX64) += espfix_64.o
obj-$(CONFIG_SYSFS) += ksysfs.o
obj-y += bootflag.o e820.o
obj-y += pci-dma.o quirks.o topology.o kdebugfs.o
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 61a5350..5d93ac1 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -246,7 +246,7 @@
/*
* 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 70fc00e..58c132d 100644
--- a/init/main.c
+++ b/init/main.c
@@ -617,7 +617,7 @@
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