diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/index.rst | 1 | ||||
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 13 | ||||
| -rw-r--r-- | Documentation/admin-guide/xfs.rst (renamed from Documentation/filesystems/xfs.txt) | 132 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt | 15 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt | 24 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/renesas,wdt.txt (renamed from Documentation/devicetree/bindings/watchdog/renesas-wdt.txt) | 0 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt | 1 | ||||
| -rw-r--r-- | Documentation/filesystems/dax.txt | 2 | ||||
| -rw-r--r-- | Documentation/riscv/boot-image-header.txt | 50 | ||||
| -rw-r--r-- | Documentation/trace/kprobetrace.rst | 42 | ||||
| -rw-r--r-- | Documentation/trace/uprobetracer.rst | 10 | ||||
| -rw-r--r-- | Documentation/watchdog/hpwdt.rst | 4 | ||||
| -rw-r--r-- | Documentation/watchdog/watchdog-parameters.rst | 11 |
13 files changed, 205 insertions, 100 deletions
diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst index 280355d08af5..33feab2f4084 100644 --- a/Documentation/admin-guide/index.rst +++ b/Documentation/admin-guide/index.rst @@ -77,6 +77,7 @@ configure specific aspects of kernel behavior to your liking. blockdev/index ext4 binderfs + xfs pm/index thunderbolt LSM/index diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a5f4004e8705..f0461456d910 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2011,6 +2011,19 @@ Built with CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y, the default is off. + kprobe_event=[probe-list] + [FTRACE] Add kprobe events and enable at boot time. + The probe-list is a semicolon delimited list of probe + definitions. Each definition is same as kprobe_events + interface, but the parameters are comma delimited. + For example, to add a kprobe event on vfs_read with + arg1 and arg2, add to the command line; + + kprobe_event=p,vfs_read,$arg1,$arg2 + + See also Documentation/trace/kprobetrace.rst "Kernel + Boot Parameter" section. + kpti= [ARM64] Control page table isolation of user and kernel address spaces. Default: enabled on cores which need mitigation. diff --git a/Documentation/filesystems/xfs.txt b/Documentation/admin-guide/xfs.rst index a5cbb5e0e3db..e76665a8f2f2 100644 --- a/Documentation/filesystems/xfs.txt +++ b/Documentation/admin-guide/xfs.rst @@ -1,4 +1,6 @@ +.. SPDX-License-Identifier: GPL-2.0 +====================== The SGI XFS Filesystem ====================== @@ -18,8 +20,6 @@ Mount Options ============= When mounting an XFS filesystem, the following options are accepted. -For boolean mount options, the names with the (*) suffix is the -default behaviour. allocsize=size Sets the buffered I/O end-of-file preallocation size when @@ -31,46 +31,43 @@ default behaviour. preallocation size, which uses a set of heuristics to optimise the preallocation size based on the current allocation patterns within the file and the access patterns - to the file. Specifying a fixed allocsize value turns off + to the file. Specifying a fixed ``allocsize`` value turns off the dynamic behaviour. - attr2 - noattr2 + attr2 or noattr2 The options enable/disable an "opportunistic" improvement to be made in the way inline extended attributes are stored on-disk. When the new form is used for the first time when - attr2 is selected (either when setting or removing extended + ``attr2`` is selected (either when setting or removing extended attributes) the on-disk superblock feature bit field will be updated to reflect this format being in use. The default behaviour is determined by the on-disk feature - bit indicating that attr2 behaviour is active. If either - mount option it set, then that becomes the new default used + bit indicating that ``attr2`` behaviour is active. If either + mount option is set, then that becomes the new default used by the filesystem. - CRC enabled filesystems always use the attr2 format, and so - will reject the noattr2 mount option if it is set. + CRC enabled filesystems always use the ``attr2`` format, and so + will reject the ``noattr2`` mount option if it is set. - discard - nodiscard (*) + discard or nodiscard (default) Enable/disable the issuing of commands to let the block device reclaim space freed by the filesystem. This is useful for SSD devices, thinly provisioned LUNs and virtual machine images, but may have a performance impact. - Note: It is currently recommended that you use the fstrim - application to discard unused blocks rather than the discard + Note: It is currently recommended that you use the ``fstrim`` + application to ``discard`` unused blocks rather than the ``discard`` mount option because the performance impact of this option is quite severe. - grpid/bsdgroups - nogrpid/sysvgroups (*) + grpid/bsdgroups or nogrpid/sysvgroups (default) These options define what group ID a newly created file - gets. When grpid is set, it takes the group ID of the + gets. When ``grpid`` is set, it takes the group ID of the directory in which it is created; otherwise it takes the - fsgid of the current process, unless the directory has the - setgid bit set, in which case it takes the gid from the - parent directory, and also gets the setgid bit set if it is + ``fsgid`` of the current process, unless the directory has the + ``setgid`` bit set, in which case it takes the ``gid`` from the + parent directory, and also gets the ``setgid`` bit set if it is a directory itself. filestreams @@ -78,46 +75,42 @@ default behaviour. across the entire filesystem rather than just on directories configured to use it. - ikeep - noikeep (*) - When ikeep is specified, XFS does not delete empty inode - clusters and keeps them around on disk. When noikeep is + ikeep or noikeep (default) + When ``ikeep`` is specified, XFS does not delete empty inode + clusters and keeps them around on disk. When ``noikeep`` is specified, empty inode clusters are returned to the free space pool. - inode32 - inode64 (*) - When inode32 is specified, it indicates that XFS limits + inode32 or inode64 (default) + When ``inode32`` is specified, it indicates that XFS limits inode creation to locations which will not result in inode numbers with more than 32 bits of significance. - When inode64 is specified, it indicates that XFS is allowed + When ``inode64`` is specified, it indicates that XFS is allowed to create inodes at any location in the filesystem, including those which will result in inode numbers occupying - more than 32 bits of significance. + more than 32 bits of significance. - inode32 is provided for backwards compatibility with older + ``inode32`` is provided for backwards compatibility with older systems and applications, since 64 bits inode numbers might cause problems for some applications that cannot handle large inode numbers. If applications are in use which do - not handle inode numbers bigger than 32 bits, the inode32 + not handle inode numbers bigger than 32 bits, the ``inode32`` option should be specified. - - largeio - nolargeio (*) - If "nolargeio" is specified, the optimal I/O reported in - st_blksize by stat(2) will be as small as possible to allow + largeio or nolargeio (default) + If ``nolargeio`` is specified, the optimal I/O reported in + ``st_blksize`` by **stat(2)** will be as small as possible to allow user applications to avoid inefficient read/modify/write I/O. This is typically the page size of the machine, as this is the granularity of the page cache. - If "largeio" specified, a filesystem that was created with a - "swidth" specified will return the "swidth" value (in bytes) - in st_blksize. If the filesystem does not have a "swidth" - specified but does specify an "allocsize" then "allocsize" + If ``largeio`` is specified, a filesystem that was created with a + ``swidth`` specified will return the ``swidth`` value (in bytes) + in ``st_blksize``. If the filesystem does not have a ``swidth`` + specified but does specify an ``allocsize`` then ``allocsize`` (in bytes) will be returned instead. Otherwise the behaviour - is the same as if "nolargeio" was specified. + is the same as if ``nolargeio`` was specified. logbufs=value Set the number of in-memory log buffers. Valid numbers @@ -127,7 +120,7 @@ default behaviour. If the memory cost of 8 log buffers is too high on small systems, then it may be reduced at some cost to performance - on metadata intensive workloads. The logbsize option below + on metadata intensive workloads. The ``logbsize`` option below controls the size of each buffer and so is also relevant to this case. @@ -138,7 +131,7 @@ default behaviour. and 32768 (32k). Valid sizes for version 2 logs also include 65536 (64k), 131072 (128k) and 262144 (256k). The logbsize must be an integer multiple of the log - stripe unit configured at mkfs time. + stripe unit configured at **mkfs(8)** time. The default value for for version 1 logs is 32768, while the default value for version 2 logs is MAX(32768, log_sunit). @@ -153,21 +146,21 @@ default behaviour. noalign Data allocations will not be aligned at stripe unit boundaries. This is only relevant to filesystems created - with non-zero data alignment parameters (sunit, swidth) by - mkfs. + with non-zero data alignment parameters (``sunit``, ``swidth``) by + **mkfs(8)**. norecovery The filesystem will be mounted without running log recovery. If the filesystem was not cleanly unmounted, it is likely to - be inconsistent when mounted in "norecovery" mode. + be inconsistent when mounted in ``norecovery`` mode. Some files or directories may not be accessible because of this. - Filesystems mounted "norecovery" must be mounted read-only or + Filesystems mounted ``norecovery`` must be mounted read-only or the mount will fail. nouuid Don't check for double mounted file systems using the file - system uuid. This is useful to mount LVM snapshot volumes, - and often used in combination with "norecovery" for mounting + system ``uuid``. This is useful to mount LVM snapshot volumes, + and often used in combination with ``norecovery`` for mounting read-only snapshots. noquota @@ -176,15 +169,15 @@ default behaviour. uquota/usrquota/uqnoenforce/quota User disk quota accounting enabled, and limits (optionally) - enforced. Refer to xfs_quota(8) for further details. + enforced. Refer to **xfs_quota(8)** for further details. gquota/grpquota/gqnoenforce Group disk quota accounting enabled and limits (optionally) - enforced. Refer to xfs_quota(8) for further details. + enforced. Refer to **xfs_quota(8)** for further details. pquota/prjquota/pqnoenforce Project disk quota accounting enabled and limits (optionally) - enforced. Refer to xfs_quota(8) for further details. + enforced. Refer to **xfs_quota(8)** for further details. sunit=value and swidth=value Used to specify the stripe unit and width for a RAID device @@ -192,11 +185,11 @@ default behaviour. block units. These options are only relevant to filesystems that were created with non-zero data alignment parameters. - The sunit and swidth parameters specified must be compatible + The ``sunit`` and ``swidth`` parameters specified must be compatible with the existing filesystem alignment characteristics. In - general, that means the only valid changes to sunit are - increasing it by a power-of-2 multiple. Valid swidth values - are any integer multiple of a valid sunit value. + general, that means the only valid changes to ``sunit`` are + increasing it by a power-of-2 multiple. Valid ``swidth`` values + are any integer multiple of a valid ``sunit`` value. Typically the only time these mount options are necessary if after an underlying RAID device has had it's geometry @@ -221,22 +214,25 @@ default behaviour. Deprecated Mount Options ======================== +=========================== ================ Name Removal Schedule - ---- ---------------- +=========================== ================ +=========================== ================ Removed Mount Options ===================== +=========================== ======= Name Removed - ---- ------- +=========================== ======= delaylog/nodelaylog v4.0 ihashsize v4.0 irixsgid v4.0 osyncisdsync/osyncisosync v4.0 barrier v4.19 nobarrier v4.19 - +=========================== ======= sysctls ======= @@ -302,27 +298,27 @@ The following sysctls are available for the XFS filesystem: fs.xfs.inherit_sync (Min: 0 Default: 1 Max: 1) Setting this to "1" will cause the "sync" flag set - by the xfs_io(8) chattr command on a directory to be + by the **xfs_io(8)** chattr command on a directory to be inherited by files in that directory. fs.xfs.inherit_nodump (Min: 0 Default: 1 Max: 1) Setting this to "1" will cause the "nodump" flag set - by the xfs_io(8) chattr command on a directory to be + by the **xfs_io(8)** chattr command on a directory to be inherited by files in that directory. fs.xfs.inherit_noatime (Min: 0 Default: 1 Max: 1) Setting this to "1" will cause the "noatime" flag set - by the xfs_io(8) chattr command on a directory to be + by the **xfs_io(8)** chattr command on a directory to be inherited by files in that directory. fs.xfs.inherit_nosymlinks (Min: 0 Default: 1 Max: 1) Setting this to "1" will cause the "nosymlinks" flag set - by the xfs_io(8) chattr command on a directory to be + by the **xfs_io(8)** chattr command on a directory to be inherited by files in that directory. fs.xfs.inherit_nodefrag (Min: 0 Default: 1 Max: 1) Setting this to "1" will cause the "nodefrag" flag set - by the xfs_io(8) chattr command on a directory to be + by the **xfs_io(8)** chattr command on a directory to be inherited by files in that directory. fs.xfs.rotorstep (Min: 1 Default: 1 Max: 256) @@ -368,7 +364,7 @@ handler: -error handlers: Defines the behavior for a specific error. -The filesystem behavior during an error can be set via sysfs files. Each +The filesystem behavior during an error can be set via ``sysfs`` files. Each error handler works independently - the first condition met by an error handler for a specific class will cause the error to be propagated rather than reset and retried. @@ -419,7 +415,7 @@ level directory: handler configurations. Note: there is no guarantee that fail_at_unmount can be set while an - unmount is in progress. It is possible that the sysfs entries are + unmount is in progress. It is possible that the ``sysfs`` entries are removed by the unmounting filesystem before a "retry forever" error handler configuration causes unmount to hang, and hence the filesystem must be configured appropriately before unmount begins to prevent @@ -428,7 +424,7 @@ level directory: Each filesystem has specific error class handlers that define the error propagation behaviour for specific errors. There is also a "default" error handler defined, which defines the behaviour for all errors that don't have -specific handlers defined. Where multiple retry constraints are configuredi for +specific handlers defined. Where multiple retry constraints are configured for a single error, the first retry configuration that expires will cause the error to be propagated. The handler configurations are found in the directory: @@ -463,7 +459,7 @@ to be propagated. The handler configurations are found in the directory: Setting the value to "N" (where 0 < N < Max) will allow XFS to retry the operation for up to "N" seconds before propagating the error. -Note: The default behaviour for a specific error handler is dependent on both +**Note:** The default behaviour for a specific error handler is dependent on both the class and error context. For example, the default values for "metadata/ENODEV" are "0" rather than "-1" so that this error handler defaults to "fail immediately" behaviour. This is done because ENODEV is a fatal, diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt index f378922906f6..a575e42f7fec 100644 --- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt @@ -145,6 +145,16 @@ Optional Child nodes: - Data cells of ocotp: Detailed bindings are described in bindings/nvmem/nvmem.txt +Watchdog bindings based on SCU Message Protocol +------------------------------------------------------------ + +Required properties: +- compatible: should be: + "fsl,imx8qxp-sc-wdt" + followed by "fsl,imx-sc-wdt"; +Optional properties: +- timeout-sec: contains the watchdog timeout in seconds. + Example (imx8qxp): ------------- aliases { @@ -207,6 +217,11 @@ firmware { rtc: rtc { compatible = "fsl,imx8qxp-sc-rtc"; }; + + watchdog { + compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt"; + timeout-sec = <60>; + }; }; }; diff --git a/Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt b/Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt deleted file mode 100644 index 02b87e92ae68..000000000000 --- a/Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt +++ /dev/null @@ -1,24 +0,0 @@ -* Freescale i.MX System Controller Watchdog - -i.MX system controller watchdog is for i.MX SoCs with system controller inside, -the watchdog is managed by system controller, users can ONLY communicate with -system controller from secure mode for watchdog operations, so Linux i.MX system -controller watchdog driver will call ARM SMC API and trap into ARM-Trusted-Firmware -for watchdog operations, ARM-Trusted-Firmware is running at secure EL3 mode and -it will request system controller to execute the watchdog operation passed from -Linux kernel. - -Required properties: -- compatible: Should be : - "fsl,imx8qxp-sc-wdt" - followed by "fsl,imx-sc-wdt"; - -Optional properties: -- timeout-sec : Contains the watchdog timeout in seconds. - -Examples: - -watchdog { - compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt"; - timeout-sec = <60>; -}; diff --git a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt b/Documentation/devicetree/bindings/watchdog/renesas,wdt.txt index 9f365c1a3399..9f365c1a3399 100644 --- a/Documentation/devicetree/bindings/watchdog/renesas-wdt.txt +++ b/Documentation/devicetree/bindings/watchdog/renesas,wdt.txt diff --git a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt index 46055254e8dd..e65198d82a2b 100644 --- a/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt +++ b/Documentation/devicetree/bindings/watchdog/sunxi-wdt.txt @@ -6,6 +6,7 @@ Required properties: "allwinner,sun4i-a10-wdt" "allwinner,sun6i-a31-wdt" "allwinner,sun50i-a64-wdt","allwinner,sun6i-a31-wdt" + "allwinner,sun50i-h6-wdt","allwinner,sun6i-a31-wdt" "allwinner,suniv-f1c100s-wdt", "allwinner,sun4i-a10-wdt" - reg : Specifies base physical address and size of the registers. diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index 6d2c0d340dea..679729442fd2 100644 --- a/Documentation/filesystems/dax.txt +++ b/Documentation/filesystems/dax.txt @@ -76,7 +76,7 @@ exposure of uninitialized data through mmap. These filesystems may be used for inspiration: - ext2: see Documentation/filesystems/ext2.txt - ext4: see Documentation/filesystems/ext4/ -- xfs: see Documentation/filesystems/xfs.txt +- xfs: see Documentation/admin-guide/xfs.rst Handling Media Errors diff --git a/Documentation/riscv/boot-image-header.txt b/Documentation/riscv/boot-image-header.txt new file mode 100644 index 000000000000..1b73fea23b39 --- /dev/null +++ b/Documentation/riscv/boot-image-header.txt @@ -0,0 +1,50 @@ + Boot image header in RISC-V Linux + ============================================= + +Author: Atish Patra <atish.patra@wdc.com> +Date : 20 May 2019 + +This document only describes the boot image header details for RISC-V Linux. +The complete booting guide will be available at Documentation/riscv/booting.txt. + +The following 64-byte header is present in decompressed Linux kernel image. + + u32 code0; /* Executable code */ + u32 code1; /* Executable code */ + u64 text_offset; /* Image load offset, little endian */ + u64 image_size; /* Effective Image size, little endian */ + u64 flags; /* kernel flags, little endian */ + u32 version; /* Version of this header */ + u32 res1 = 0; /* Reserved */ + u64 res2 = 0; /* Reserved */ + u64 magic = 0x5643534952; /* Magic number, little endian, "RISCV" */ + u32 res3; /* Reserved for additional RISC-V specific header */ + u32 res4; /* Reserved for PE COFF offset */ + +This header format is compliant with PE/COFF header and largely inspired from +ARM64 header. Thus, both ARM64 & RISC-V header can be combined into one common +header in future. + +Notes: +- This header can also be reused to support EFI stub for RISC-V in future. EFI + specification needs PE/COFF image header in the beginning of the kernel image + in order to load it as an EFI application. In order to support EFI stub, + code0 should be replaced with "MZ" magic string and res5(at offset 0x3c) should + point to the rest of the PE/COFF header. + +- version field indicate header version number. + Bits 0:15 - Minor version + Bits 16:31 - Major version + + This preserves compatibility across newer and older version of the header. + The current version is defined as 0.1. + +- res3 is reserved for offset to any other additional fields. This makes the + header extendible in future. One example would be to accommodate ISA + extension for RISC-V in future. For current version, it is set to be zero. + +- In current header, the flag field has only one field. + Bit 0: Kernel endianness. 1 if BE, 0 if LE. + +- Image size is mandatory for boot loader to load kernel image. Booting will + fail otherwise. diff --git a/Documentation/trace/kprobetrace.rst b/Documentation/trace/kprobetrace.rst index 7d2b0178d3f3..fbb314bfa112 100644 --- a/Documentation/trace/kprobetrace.rst +++ b/Documentation/trace/kprobetrace.rst @@ -51,15 +51,17 @@ Synopsis of kprobe_events $argN : Fetch the Nth function argument. (N >= 1) (\*1) $retval : Fetch return value.(\*2) $comm : Fetch current task comm. - +|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(\*3) + +|-[u]OFFS(FETCHARG) : Fetch memory at FETCHARG +|- OFFS address.(\*3)(\*4) NAME=FETCHARG : Set NAME as the argument name of FETCHARG. FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types (u8/u16/u32/u64/s8/s16/s32/s64), hexadecimal types - (x8/x16/x32/x64), "string" and bitfield are supported. + (x8/x16/x32/x64), "string", "ustring" and bitfield + are supported. (\*1) only for the probe on function entry (offs == 0). (\*2) only for return probe. (\*3) this is useful for fetching a field of data structures. + (\*4) "u" means user-space dereference. See :ref:`user_mem_access`. Types ----- @@ -77,7 +79,8 @@ apply it to registers/stack-entries etc. (for example, '$stack1:x8[8]' is wrong, but '+8($stack):x8[8]' is OK.) String type is a special type, which fetches a "null-terminated" string from kernel space. This means it will fail and store NULL if the string container -has been paged out. +has been paged out. "ustring" type is an alternative of string for user-space. +See :ref:`user_mem_access` for more info.. The string array type is a bit different from other types. For other base types, <base-type>[1] is equal to <base-type> (e.g. +0(%di):x32[1] is same as +0(%di):x32.) But string[1] is not equal to string. The string type itself @@ -92,6 +95,25 @@ Symbol type('symbol') is an alias of u32 or u64 type (depends on BITS_PER_LONG) which shows given pointer in "symbol+offset" style. For $comm, the default type is "string"; any other type is invalid. +.. _user_mem_access: +User Memory Access +------------------ +Kprobe events supports user-space memory access. For that purpose, you can use +either user-space dereference syntax or 'ustring' type. + +The user-space dereference syntax allows you to access a field of a data +structure in user-space. This is done by adding the "u" prefix to the +dereference syntax. For example, +u4(%si) means it will read memory from the +address in the register %si offset by 4, and the memory is expected to be in +user-space. You can use this for strings too, e.g. +u0(%si):string will read +a string from the address in the register %si that is expected to be in user- +space. 'ustring' is a shortcut way of performing the same task. That is, ++0(%si):ustring is equivalent to +u0(%si):string. + +Note that kprobe-event provides the user-memory access syntax but it doesn't +use it transparently. This means if you use normal dereference or string type +for user memory, it might fail, and may always fail on some archs. The user +has to carefully check if the target data is in kernel or user space. Per-Probe Event Filtering ------------------------- @@ -124,6 +146,20 @@ You can check the total number of probe hits and probe miss-hits via The first column is event name, the second is the number of probe hits, the third is the number of probe miss-hits. +Kernel Boot Parameter +--------------------- +You can add and enable new kprobe events when booting up the kernel by +"kprobe_event=" parameter. The parameter accepts a semicolon-delimited +kprobe events, which format is similar to the kprobe_events. +The difference is that the probe definition parameters are comma-delimited +instead of space. For example, adding myprobe event on do_sys_open like below + + p:myprobe do_sys_open dfd=%ax filename=%dx flags=%cx mode=+4($stack) + +should be below for kernel boot parameter (just replace spaces with comma) + + p:myprobe,do_sys_open,dfd=%ax,filename=%dx,flags=%cx,mode=+4($stack) + Usage examples -------------- diff --git a/Documentation/trace/uprobetracer.rst b/Documentation/trace/uprobetracer.rst index 0b21305fabdc..6e75a6c5a2c8 100644 --- a/Documentation/trace/uprobetracer.rst +++ b/Documentation/trace/uprobetracer.rst @@ -42,16 +42,18 @@ Synopsis of uprobe_tracer @+OFFSET : Fetch memory at OFFSET (OFFSET from same file as PATH) $stackN : Fetch Nth entry of stack (N >= 0) $stack : Fetch stack address. - $retval : Fetch return value.(*) + $retval : Fetch return value.(\*1) $comm : Fetch current task comm. - +|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(**) + +|-[u]OFFS(FETCHARG) : Fetch memory at FETCHARG +|- OFFS address.(\*2)(\*3) NAME=FETCHARG : Set NAME as the argument name of FETCHARG. FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types (u8/u16/u32/u64/s8/s16/s32/s64), hexadecimal types (x8/x16/x32/x64), "string" and bitfield are supported. - (*) only for return probe. - (**) this is useful for fetching a field of data structures. + (\*1) only for return probe. + (\*2) this is useful for fetching a field of data structures. + (\*3) Unlike kprobe event, "u" prefix will just be ignored, becuse uprobe + events can access only user-space memory. Types ----- diff --git a/Documentation/watchdog/hpwdt.rst b/Documentation/watchdog/hpwdt.rst index 94a96371113e..c165d92cfd12 100644 --- a/Documentation/watchdog/hpwdt.rst +++ b/Documentation/watchdog/hpwdt.rst @@ -39,6 +39,10 @@ Last reviewed: 08/20/2018 Default value is set when compiling the kernel. If it is set to "Y", then there is no way of disabling the watchdog once it has been started. + kdumptimeout Minimum timeout in seconds to apply upon receipt of an NMI + before calling panic. (-1) disables the watchdog. When value + is > 0, the timer is reprogrammed with the greater of + value or current timeout value. ============ ================================================================ NOTE: diff --git a/Documentation/watchdog/watchdog-parameters.rst b/Documentation/watchdog/watchdog-parameters.rst index b121caae7798..a3985cc5aeda 100644 --- a/Documentation/watchdog/watchdog-parameters.rst +++ b/Documentation/watchdog/watchdog-parameters.rst @@ -13,6 +13,17 @@ modules. ------------------------------------------------- +watchdog core: + open_timeout: + Maximum time, in seconds, for which the watchdog framework will take + care of pinging a running hardware watchdog until userspace opens the + corresponding /dev/watchdogN device. A value of 0 means an infinite + timeout. Setting this to a non-zero value can be useful to ensure that + either userspace comes up properly, or the board gets reset and allows + fallback logic in the bootloader to try something else. + +------------------------------------------------- + acquirewdt: wdt_stop: Acquire WDT 'stop' io port (default 0x43) |