Commit 197725de authored by H. Peter Anvin's avatar H. Peter Anvin
Browse files

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: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarH. 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
parent 20b68535

arch/x86/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -914,6 +914,10 @@ 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

arch/x86/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o 
obj-y			+= syscall_$(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

arch/x86/kernel/smpboot.c

+1 −1
Original line number Diff line number Diff line
@@ -246,7 +246,7 @@ 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

init/main.c

+1 −1
Original line number Diff line number Diff line
@@ -617,7 +617,7 @@ 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

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