x86: default corruption check to off, but put parameter default in Kconfig

[linux-2.6-omap-h63xx.git] / arch / x86 / Kconfig

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3d0f2b6a5a16e6edd6f349b4b19756a5d2cecff7..7820d447bb8d31f71c40b1347ca94d8cf2a9649f 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -22,7 +22,6 @@ config X86
        select HAVE_IDE
        select HAVE_OPROFILE
        select HAVE_IOREMAP_PROT
-       select HAVE_GET_USER_PAGES_FAST
        select HAVE_KPROBES
        select ARCH_WANT_OPTIONAL_GPIOLIB
        select HAVE_KRETPROBES
@@ -578,35 +577,29 @@ config SWIOTLB
 
 config IOMMU_HELPER
        def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
+
 config MAXSMP
        bool "Configure Maximum number of SMP Processors and NUMA Nodes"
-       depends on X86_64 && SMP
+       depends on X86_64 && SMP && BROKEN
        default n
        help
          Configure maximum number of CPUS and NUMA Nodes for this architecture.
          If unsure, say N.
 
-if MAXSMP
 config NR_CPUS
-       int
-       default "4096"
-endif
-
-if !MAXSMP
-config NR_CPUS
-       int "Maximum number of CPUs (2-4096)"
-       range 2 4096
+       int "Maximum number of CPUs (2-512)" if !MAXSMP
+       range 2 512
        depends on SMP
+       default "4096" if MAXSMP
        default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
        default "8"
        help
          This allows you to specify the maximum number of CPUs which this
-         kernel will support.  The maximum supported value is 4096 and the
+         kernel will support.  The maximum supported value is 512 and the
          minimum value which makes sense is 2.
 
          This is purely to save memory - each supported CPU adds
          approximately eight kilobytes to the kernel image.
-endif
 
 config SCHED_SMT
        bool "SMT (Hyperthreading) scheduler support"
@@ -952,9 +945,9 @@ config NUMA
          local memory controller of the CPU and add some more
          NUMA awareness to the kernel.
 
-         For i386 this is currently highly experimental and should be only
+         For 32-bit this is currently highly experimental and should be only
          used for kernel development. It might also cause boot failures.
-         For x86_64 this is recommended on all multiprocessor Opteron systems.
+         For 64-bit this is recommended on all multiprocessor Opteron systems.
          If the system is EM64T, you should say N unless your system is
          EM64T NUMA.
 
@@ -997,17 +990,10 @@ config NUMA_EMU
          into virtual nodes when booted with "numa=fake=N", where N is the
          number of nodes. This is only useful for debugging.
 
-if MAXSMP
-
 config NODES_SHIFT
-       int
-       default "9"
-endif
-
-if !MAXSMP
-config NODES_SHIFT
-       int "Maximum NUMA Nodes (as a power of 2)"
+       int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
        range 1 9   if X86_64
+       default "9" if MAXSMP
        default "6" if X86_64
        default "4" if X86_NUMAQ
        default "3"
@@ -1015,7 +1001,6 @@ config NODES_SHIFT
        help
          Specify the maximum number of NUMA Nodes available on the target
          system.  Increases memory reserved to accomodate various tables.
-endif
 
 config HAVE_ARCH_BOOTMEM_NODE
        def_bool y
@@ -1074,6 +1059,36 @@ config HIGHPTE
          low memory.  Setting this option will put user-space page table
          entries in high memory.
 
+config X86_CHECK_BIOS_CORRUPTION
+        bool "Check for low memory corruption"
+       help
+        Periodically check for memory corruption in low memory, which
+        is suspected to be caused by BIOS.  Even when enabled in the
+        configuration, it is disabled at runtime.  Enable it by
+        setting "memory_corruption_check=1" on the kernel command
+        line.  By default it scans the low 64k of memory every 60
+        seconds; see the memory_corruption_check_size and
+        memory_corruption_check_period parameters in
+        Documentation/kernel-parameters.txt to adjust this.
+
+        When enabled with the default parameters, this option has
+        almost no overhead, as it reserves a relatively small amount
+        of memory and scans it infrequently.  It both detects corruption
+        and prevents it from affecting the running system.
+
+        It is, however, intended as a diagnostic tool; if repeatable
+        BIOS-originated corruption always affects the same memory,
+        you can use memmap= to prevent the kernel from using that
+        memory.
+
+config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
+        bool "Set the default setting of memory_corruption_check"
+       depends on X86_CHECK_BIOS_CORRUPTION
+       default y
+       help
+        Set whether the default state of memory_corruption_check is
+        on or off.
+
 config MATH_EMULATION
        bool
        prompt "Math emulation" if X86_32
@@ -1264,7 +1279,7 @@ config KEXEC
          strongly in flux, so no good recommendation can be made.
 
 config CRASH_DUMP
-       bool "kernel crash dumps (EXPERIMENTAL)"
+       bool "kernel crash dumps"
        depends on X86_64 || (X86_32 && HIGHMEM)
        help
          Generate crash dump after being started by kexec.