diff options
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e1d0c9ac2b56..f73071742975 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -107,9 +107,9 @@ config X86 select HAVE_ARCH_SOFT_DIRTY select CLOCKSOURCE_WATCHDOG select GENERIC_CLOCKEVENTS - select ARCH_CLOCKSOURCE_DATA if X86_64 + select ARCH_CLOCKSOURCE_DATA select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) - select GENERIC_TIME_VSYSCALL if X86_64 + select GENERIC_TIME_VSYSCALL select KTIME_SCALAR if X86_32 select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER @@ -127,6 +127,7 @@ config X86 select HAVE_DEBUG_STACKOVERFLOW select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64 select HAVE_CC_STACKPROTECTOR + select GENERIC_CPU_AUTOPROBE config INSTRUCTION_DECODER def_bool y @@ -195,9 +196,6 @@ config ARCH_HAS_CPU_RELAX config ARCH_HAS_CACHE_LINE_SIZE def_bool y -config ARCH_HAS_CPU_AUTOPROBE - def_bool y - config HAVE_SETUP_PER_CPU_AREA def_bool y @@ -1521,6 +1519,20 @@ config EFI_STUB See Documentation/efi-stub.txt for more information. +config EFI_MIXED + bool "EFI mixed-mode support" + depends on EFI_STUB && X86_64 + ---help--- + Enabling this feature allows a 64-bit kernel to be booted + on a 32-bit firmware, provided that your CPU supports 64-bit + mode. + + Note that it is not possible to boot a mixed-mode enabled + kernel via the EFI boot stub - a bootloader that supports + the EFI handover protocol must be used. + + If unsure, say N. + config SECCOMP def_bool y prompt "Enable seccomp to safely compute untrusted bytecode" @@ -1772,17 +1784,29 @@ config DEBUG_HOTPLUG_CPU0 If unsure, say N. config COMPAT_VDSO - def_bool y - prompt "Compat VDSO support" + def_bool n + prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)" depends on X86_32 || IA32_EMULATION ---help--- - Map the 32-bit VDSO to the predictable old-style address too. + Certain buggy versions of glibc will crash if they are + presented with a 32-bit vDSO that is not mapped at the address + indicated in its segment table. - Say N here if you are running a sufficiently recent glibc - version (2.3.3 or later), to remove the high-mapped - VDSO mapping and to exclusively use the randomized VDSO. + The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a + and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and + 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is + the only released version with the bug, but OpenSUSE 9 + contains a buggy "glibc 2.3.2". - If unsure, say Y. + The symptom of the bug is that everything crashes on startup, saying: + dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed! + + Saying Y here changes the default value of the vdso32 boot + option from 1 to 0, which turns off the 32-bit vDSO entirely. + This works around the glibc bug but hurts performance. + + If unsure, say N: if you are compiling your own kernel, you + are unlikely to be using a buggy version of glibc. config CMDLINE_BOOL bool "Built-in kernel command line" |