diff options
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 70 |
1 files changed, 47 insertions, 23 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index e46c2147397..61bd2ad9428 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -59,15 +59,15 @@ config EARLY_PRINTK_DBGP with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash. You need usb debug device. -config DEBUG_STACKOVERFLOW - bool "Check for stack overflows" - depends on DEBUG_KERNEL +config EARLY_PRINTK_EFI + bool "Early printk via the EFI framebuffer" + depends on EFI && EARLY_PRINTK + select FONT_SUPPORT ---help--- - Say Y here if you want to check the overflows of kernel, IRQ - and exception stacks. This option will cause messages of the - stacks in detail when free stack space drops below a certain - limit. - If in doubt, say "N". + Write kernel log output directly into the EFI framebuffer. + + This is useful for kernel debugging when your machine crashes very + early before the console code is initialized. config X86_PTDUMP bool "Export kernel pagetable layout to userspace via debugfs" @@ -81,6 +81,15 @@ config X86_PTDUMP kernel. If in doubt, say "N" +config EFI_PGT_DUMP + bool "Dump the EFI pagetable" + depends on EFI && X86_PTDUMP + ---help--- + Enable this if you want to dump the EFI page table before + enabling virtual mode. This can be used to debug miscellaneous + issues with the mapping of the EFI runtime regions into that + table. + config DEBUG_RODATA bool "Write protect kernel read-only data structures" default y @@ -122,13 +131,31 @@ config DEBUG_NX_TEST config DOUBLEFAULT default y bool "Enable doublefault exception handler" if EXPERT - depends on X86_32 ---help--- This option allows trapping of rare doublefault exceptions that would otherwise cause a system to silently reboot. Disabling this option saves about 4k and might cause you much additional grey hair. +config DEBUG_TLBFLUSH + bool "Set upper limit of TLB entries to flush one-by-one" + depends on DEBUG_KERNEL + ---help--- + + X86-only for now. + + This option allows the user to tune the amount of TLB entries the + kernel flushes one-by-one instead of doing a full TLB flush. In + certain situations, the former is cheaper. This is controlled by the + tlb_flushall_shift knob under /sys/kernel/debug/x86. If you set it + to -1, the code flushes the whole TLB unconditionally. Otherwise, + for positive values of it, the kernel will use single TLB entry + invalidating instructions according to the following formula: + + flush_entries <= active_tlb_entries / 2^tlb_flushall_shift + + If in doubt, say "N". + config IOMMU_DEBUG bool "Enable IOMMU debugging" depends on GART_IOMMU && DEBUG_KERNEL @@ -166,6 +193,7 @@ config HAVE_MMIOTRACE_SUPPORT config X86_DECODER_SELFTEST bool "x86 instruction decoder selftest" depends on DEBUG_KERNEL && KPROBES + depends on !COMPILE_TEST ---help--- Perform x86 instruction decoder selftests at build time. This option is useful for checking the sanity of x86 instruction @@ -273,20 +301,6 @@ config OPTIMIZE_INLINING If unsure, say N. -config DEBUG_STRICT_USER_COPY_CHECKS - bool "Strict copy size checks" - depends on DEBUG_KERNEL && !TRACE_BRANCH_PROFILING - ---help--- - Enabling this option turns a certain set of sanity checks for user - copy operations into compile time failures. - - The copy_from_user() etc checks are there to help test if there - are sufficient security checks on the length argument of - the copy operation, by having gcc prove that the argument is - within bounds. - - If unsure, or if you run an older (pre 4.4) gcc, say N. - config DEBUG_NMI_SELFTEST bool "NMI Selftest" depends on DEBUG_KERNEL && X86_LOCAL_APIC @@ -299,4 +313,14 @@ config DEBUG_NMI_SELFTEST If unsure, say N. +config X86_DEBUG_STATIC_CPU_HAS + bool "Debug alternatives" + depends on DEBUG_KERNEL + ---help--- + This option causes additional code to be generated which + fails if static_cpu_has() is used before alternatives have + run. + + If unsure, say N. + endmenu |