[PATCH 3.15 30/42] x86, espfix: Make espfix64 a Kconfig option, fix UML
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2014-08-05 18:49:25
Also in:
lkml
3.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: "H. Peter Anvin" <hpa@zytor.com> 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@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 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- 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(-)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig@@ -915,6 +915,10 @@ 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 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile
@@ -29,7 +29,7 @@ obj-$(CONFIG_X86_64) += sys_x86_64.o x86 obj-y += syscall_$(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 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c
@@ -246,7 +246,7 @@ static void notrace start_secondary(void /* * Enable the espfix hack for this CPU */ -#ifdef CONFIG_X86_64 +#ifdef CONFIG_X86_ESPFIX64 init_espfix_ap(); #endif --- a/init/main.c +++ b/init/main.c
@@ -617,7 +617,7 @@ asmlinkage __visible void __init start_k 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