diff options
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index acc0271920f2..85a87d2ac0c0 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -5,13 +5,15 @@ config TRACE_IRQFLAGS_SUPPORT 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 left on, 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. @@ -171,6 +173,33 @@ config IOMMU_LEAK 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: # @@ -260,7 +289,6 @@ config CPA_DEBUG 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 @@ -271,5 +299,7 @@ config OPTIMIZE_INLINING become the default in the future, until then this option is there to test gcc for this. + If unsure, say N. + endmenu |