source "lib/Kconfig.debug"
-config NONPROMISC_DEVMEM
+config STRICT_DEVMEM
bool "Filter access to /dev/mem"
help
- If this option is left off, you allow userspace access to all
+ If this option is disabled, you allow userspace (root) access to all
of memory, including kernel and userspace memory. Accidental
access to this is obviously disastrous, but specific access can
- be used by people debugging the kernel.
+ be used by people debugging the kernel. Note that with PAT support
+ enabled, even in this case there are restrictions on /dev/mem
+ use due to the cache aliasing requirements.
If this option is switched on, the /dev/mem file only allows
userspace access to PCI space and the BIOS code and data regions.
If in doubt, say Y.
+config X86_VERBOSE_BOOTUP
+ bool "Enable verbose x86 bootup info messages"
+ default y
+ help
+ Enables the informational output from the decompression stage
+ (e.g. bzImage) of the boot. If you disable this you will still
+ see errors. Disable this if you want silent bootup.
+
config EARLY_PRINTK
bool "Early printk" if EMBEDDED
default y
config DEBUG_PER_CPU_MAPS
bool "Debug access to per_cpu maps"
depends on DEBUG_KERNEL
- depends on X86_64_SMP
+ depends on X86_SMP
default n
help
Say Y to verify that the per_cpu map being accessed has
on the VM subsystem for higher order allocations. This option
will also use IRQ stacks to compensate for the reduced stackspace.
-config X86_FIND_SMP_CONFIG
- def_bool y
- depends on X86_LOCAL_APIC || X86_VOYAGER
- depends on X86_32
-
-config X86_MPPARSE
- def_bool y
- depends on (X86_32 && (X86_LOCAL_APIC && !X86_VISWS)) || X86_64
-
config DOUBLEFAULT
default y
bool "Enable doublefault exception handler" if EMBEDDED
Add a simple leak tracer to the IOMMU code. This is useful when you
are debugging a buggy device driver that leaks IOMMU mappings.
+config MMIOTRACE_HOOKS
+ bool
+
+config MMIOTRACE
+ bool "Memory mapped IO tracing"
+ depends on DEBUG_KERNEL && PCI
+ select TRACING
+ select MMIOTRACE_HOOKS
+ help
+ Mmiotrace traces Memory Mapped I/O access and is meant for
+ debugging and reverse engineering. It is called from the ioremap
+ implementation and works via page faults. Tracing is disabled by
+ default and can be enabled at run-time.
+
+ See Documentation/tracers/mmiotrace.txt.
+ If you are not helping to develop drivers, say N.
+
+config MMIOTRACE_TEST
+ tristate "Test module for mmiotrace"
+ depends on MMIOTRACE && m
+ help
+ This is a dumb module for testing mmiotrace. It is very dangerous
+ as it will write garbage to IO memory starting at a given address.
+ However, it should be safe to use on e.g. unused portion of VRAM.
+
+ Say N, unless you absolutely know what you are doing.
+
#
# IO delay types:
#
config OPTIMIZE_INLINING
bool "Allow gcc to uninline functions marked 'inline'"
- depends on BROKEN
help
This option determines if the kernel forces gcc to inline the functions
developers have marked 'inline'. Doing so takes away freedom from gcc to
become the default in the future, until then this option is there to
test gcc for this.
+ If unsure, say N.
+
endmenu