[PATCH] autofs4: fix another race between mount and expire

[linux-2.6-omap-h63xx.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index ef69c75780bf4e5ca4650411033f8711b0771fd2..c479d30eeaa384c019550194d12c94c10bf1e948 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -48,6 +48,7 @@ parameter is applicable:
        ISAPNP  ISA PnP code is enabled.
        ISDN    Appropriate ISDN support is enabled.
        JOY     Appropriate joystick support is enabled.
        ISAPNP  ISA PnP code is enabled.
        ISDN    Appropriate ISDN support is enabled.
        JOY     Appropriate joystick support is enabled.

+       LIBATA  Libata driver is enabled

        LP      Printer support is enabled.
        LOOP    Loopback device support is enabled.
        M68k    M68k architecture is enabled.
        LP      Printer support is enabled.
        LOOP    Loopback device support is enabled.
        M68k    M68k architecture is enabled.


@@ -104,6 +105,9 @@ loader, and have no meaning to the kernel directly.
 Do not modify the syntax of boot loader parameters without extreme
 need or coordination with <Documentation/i386/boot.txt>.
 
 Do not modify the syntax of boot loader parameters without extreme
 need or coordination with <Documentation/i386/boot.txt>.
 

+There are also arch-specific kernel-parameters not documented here.
+See for example <Documentation/x86_64/boot-options.txt>.
+

 Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
 a trailing = on the name of any parameter states that that parameter will
 be entered as an environment variable, whereas its absence indicates that
 Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
 a trailing = on the name of any parameter states that that parameter will
 be entered as an environment variable, whereas its absence indicates that


@@ -361,6 +365,11 @@ and is between 256 and 4096 characters. It is defined in the file
                        clocksource is not available, it defaults to PIT.
                        Format: { pit | tsc | cyclone | pmtmr }
 
                        clocksource is not available, it defaults to PIT.
                        Format: { pit | tsc | cyclone | pmtmr }
 

+       code_bytes      [IA32] How many bytes of object code to print in an
+                       oops report.
+                       Range: 0 - 8192
+                       Default: 64
+

        disable_8254_timer
        enable_8254_timer
                        [IA32/X86_64] Disable/Enable interrupt 0 timer routing
        disable_8254_timer
        enable_8254_timer
                        [IA32/X86_64] Disable/Enable interrupt 0 timer routing


@@ -601,6 +610,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        highmem otherwise. This also works to reduce highmem
                        size on bigger boxes.
 
                        highmem otherwise. This also works to reduce highmem
                        size on bigger boxes.
 

+       highres=        [KNL] Enable/disable high resolution timer mode.
+                       Valid parameters: "on", "off"
+                       Default: "on"
+

        hisax=          [HW,ISDN]
                        See Documentation/isdn/README.HiSax.
 
        hisax=          [HW,ISDN]
                        See Documentation/isdn/README.HiSax.
 


@@ -851,7 +864,14 @@ and is between 256 and 4096 characters. It is defined in the file
                        Format: <1-256>
 
        maxcpus=        [SMP] Maximum number of processors that an SMP kernel
                        Format: <1-256>
 
        maxcpus=        [SMP] Maximum number of processors that an SMP kernel

-                       should make use of
+                       should make use of.
+                       Using "nosmp" or "maxcpus=0" will disable SMP
+                       entirely (the MPS table probe still happens, though).
+                       A command-line option of "maxcpus=<NUM>", where <NUM>
+                       is an integer greater than 0, limits the maximum number
+                       of CPUs activated in SMP mode to <NUM>.
+                       Using "maxcpus=1" on an SMP kernel is the trivial
+                       case of an SMP kernel with only one CPU.

 
        max_addr=[KMG]  [KNL,BOOT,ia64] All physical memory greater than or
                        equal to this physical address is ignored.
 
        max_addr=[KMG]  [KNL,BOOT,ia64] All physical memory greater than or
                        equal to this physical address is ignored.


@@ -1026,6 +1046,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        emulation library even if a 387 maths coprocessor
                        is present.
 
                        emulation library even if a 387 maths coprocessor
                        is present.
 

+       noacpi          [LIBATA] Disables use of ACPI in libata suspend/resume
+                       when set.
+                       Format: <int>
+

        noaliencache    [MM, NUMA] Disables the allcoation of alien caches in
                        the slab allocator.  Saves per-node memory, but will
                        impact performance on real NUMA hardware.
        noaliencache    [MM, NUMA] Disables the allcoation of alien caches in
                        the slab allocator.  Saves per-node memory, but will
                        impact performance on real NUMA hardware.


@@ -1070,6 +1094,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        in certain environments such as networked servers or
                        real-time systems.
 
                        in certain environments such as networked servers or
                        real-time systems.
 

+       nohz=           [KNL] Boottime enable/disable dynamic ticks
+                       Valid arguments: on, off
+                       Default: on
+

        noirqbalance    [IA-32,SMP,KNL] Disable kernel irq balancing
 
        noirqdebug      [IA-32] Disables the code which attempts to detect and
        noirqbalance    [IA-32,SMP,KNL] Disable kernel irq balancing
 
        noirqdebug      [IA-32] Disables the code which attempts to detect and


@@ -1259,6 +1287,12 @@ and is between 256 and 4096 characters. It is defined in the file
                                This sorting is done to get a device
                                order compatible with older (<= 2.4) kernels.
                nobfsort        Don't sort PCI devices into breadth-first order.
                                This sorting is done to get a device
                                order compatible with older (<= 2.4) kernels.
                nobfsort        Don't sort PCI devices into breadth-first order.

+               cbiosize=nn[KMG]        The fixed amount of bus space which is
+                               reserved for the CardBus bridge's IO window.
+                               The default value is 256 bytes.
+               cbmemsize=nn[KMG]       The fixed amount of bus space which is
+                               reserved for the CardBus bridge's memory
+                               window. The default value is 64 megabytes.

 
        pcmv=           [HW,PCMCIA] BadgePAD 4
 
 
        pcmv=           [HW,PCMCIA] BadgePAD 4
 


@@ -1396,6 +1430,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        in <PAGE_SIZE> units (needed only for swap files).
                        See  Documentation/power/swsusp-and-swap-files.txt
 
                        in <PAGE_SIZE> units (needed only for swap files).
                        See  Documentation/power/swsusp-and-swap-files.txt
 

+       retain_initrd   [RAM] Keep initrd memory after extraction
+

        rhash_entries=  [KNL,NET]
                        Set number of hash buckets for route cache
 
        rhash_entries=  [KNL,NET]
                        Set number of hash buckets for route cache
 


@@ -1714,6 +1750,14 @@ and is between 256 and 4096 characters. It is defined in the file
        uart6850=       [HW,OSS]
                        Format: <io>,<irq>
 
        uart6850=       [HW,OSS]
                        Format: <io>,<irq>
 

+       uhci-hcd.ignore_oc=
+                       [USB] Ignore overcurrent events (default N).
+                       Some badly-designed motherboards generate lots of
+                       bogus events, for ports that aren't wired to
+                       anything.  Set this parameter to avoid log spamming.
+                       Note that genuine overcurrent events won't be
+                       reported either.
+

        usbhid.mousepoll=
                        [USBHID] The interval which mice are to be polled at.
 
        usbhid.mousepoll=
                        [USBHID] The interval which mice are to be polled at.