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authorH. Peter Anvin <hpa@zytor.com>2014-05-04 10:00:49 -0700
committerH. Peter Anvin <hpa@zytor.com>2014-05-04 10:00:49 -0700
commit197725de65477bc8509b41388157c1a2283542bb (patch)
tree3c6a93426fe489b6c8f6e87027c73cf970bacdc5
parent20b68535cd27183ebd3651ff313afb2b97dac941 (diff)
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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
-rw-r--r--arch/x86/Kconfig4
-rw-r--r--arch/x86/kernel/Makefile2
-rw-r--r--arch/x86/kernel/smpboot.c2
-rw-r--r--init/main.c2
4 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 25d2c6f7325e..9a952a572585 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 1cc3789d99d9..491ef3e59850 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 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 61a5350850fb..5d93ac1b72db 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -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
diff --git a/init/main.c b/init/main.c
index 70fc00e7db06..58c132d7de4b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -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