admin-guide: move tainted kernels info to a separate file

The tainted kernels info is not directly related to
the oops tracing. So, let's move it to a separate file.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/index.rst

@@ -28,6 +28,7 @@ problems and bugs in particular.
    bug-hunting
    bug-bisect
    oops-tracing
+   tainted-kernels
    ramoops
    dynamic-debug-howto
    init

Documentation/admin-guide/oops-tracing.rst

@@ -239,62 +239,3 @@ processed by ``klogd``::
 
 ---------------------------------------------------------------------------
 
-Tainted kernels
----------------
-
-Some oops reports contain the string **'Tainted: '** after the program
-counter. This indicates that the kernel has been tainted by some
-mechanism.  The string is followed by a series of position-sensitive
-characters, each representing a particular tainted value.
-
-  1) 'G' if all modules loaded have a GPL or compatible license, 'P' if
-     any proprietary module has been loaded.  Modules without a
-     MODULE_LICENSE or with a MODULE_LICENSE that is not recognised by
-     insmod as GPL compatible are assumed to be proprietary.
-
-  2) ``F`` if any module was force loaded by ``insmod -f``, ``' '`` if all
-     modules were loaded normally.
-
-  3) ``S`` if the oops occurred on an SMP kernel running on hardware that
-     hasn't been certified as safe to run multiprocessor.
-     Currently this occurs only on various Athlons that are not
-     SMP capable.
-
-  4) ``R`` if a module was force unloaded by ``rmmod -f``, ``' '`` if all
-     modules were unloaded normally.
-
-  5) ``M`` if any processor has reported a Machine Check Exception,
-     ``' '`` if no Machine Check Exceptions have occurred.
-
-  6) ``B`` if a page-release function has found a bad page reference or
-     some unexpected page flags.
-
-  7) ``U`` if a user or user application specifically requested that the
-     Tainted flag be set, ``' '`` otherwise.
-
-  8) ``D`` if the kernel has died recently, i.e. there was an OOPS or BUG.
-
-  9) ``A`` if the ACPI table has been overridden.
-
- 10) ``W`` if a warning has previously been issued by the kernel.
-     (Though some warnings may set more specific taint flags.)
-
- 11) ``C`` if a staging driver has been loaded.
-
- 12) ``I`` if the kernel is working around a severe bug in the platform
-     firmware (BIOS or similar).
-
- 13) ``O`` if an externally-built ("out-of-tree") module has been loaded.
-
- 14) ``E`` if an unsigned module has been loaded in a kernel supporting
-     module signature.
-
- 15) ``L`` if a soft lockup has previously occurred on the system.
-
- 16) ``K`` if the kernel has been live patched.
-
-The primary reason for the **'Tainted: '** string is to tell kernel
-debuggers if this is a clean kernel or if anything unusual has
-occurred.  Tainting is permanent: even if an offending module is
-unloaded, the tainted value remains to indicate that the kernel is not
-trustworthy.

Documentation/admin-guide/tainted-kernels.rst

@@ -0,0 +1,59 @@
+Tainted kernels
+---------------
+
+Some oops reports contain the string **'Tainted: '** after the program
+counter. This indicates that the kernel has been tainted by some
+mechanism.  The string is followed by a series of position-sensitive
+characters, each representing a particular tainted value.
+
+  1) 'G' if all modules loaded have a GPL or compatible license, 'P' if
+     any proprietary module has been loaded.  Modules without a
+     MODULE_LICENSE or with a MODULE_LICENSE that is not recognised by
+     insmod as GPL compatible are assumed to be proprietary.
+
+  2) ``F`` if any module was force loaded by ``insmod -f``, ``' '`` if all
+     modules were loaded normally.
+
+  3) ``S`` if the oops occurred on an SMP kernel running on hardware that
+     hasn't been certified as safe to run multiprocessor.
+     Currently this occurs only on various Athlons that are not
+     SMP capable.
+
+  4) ``R`` if a module was force unloaded by ``rmmod -f``, ``' '`` if all
+     modules were unloaded normally.
+
+  5) ``M`` if any processor has reported a Machine Check Exception,
+     ``' '`` if no Machine Check Exceptions have occurred.
+
+  6) ``B`` if a page-release function has found a bad page reference or
+     some unexpected page flags.
+
+  7) ``U`` if a user or user application specifically requested that the
+     Tainted flag be set, ``' '`` otherwise.
+
+  8) ``D`` if the kernel has died recently, i.e. there was an OOPS or BUG.
+
+  9) ``A`` if the ACPI table has been overridden.
+
+ 10) ``W`` if a warning has previously been issued by the kernel.
+     (Though some warnings may set more specific taint flags.)
+
+ 11) ``C`` if a staging driver has been loaded.
+
+ 12) ``I`` if the kernel is working around a severe bug in the platform
+     firmware (BIOS or similar).
+
+ 13) ``O`` if an externally-built ("out-of-tree") module has been loaded.
+
+ 14) ``E`` if an unsigned module has been loaded in a kernel supporting
+     module signature.
+
+ 15) ``L`` if a soft lockup has previously occurred on the system.
+
+ 16) ``K`` if the kernel has been live patched.
+
+The primary reason for the **'Tainted: '** string is to tell kernel
+debuggers if this is a clean kernel or if anything unusual has
+occurred.  Tainting is permanent: even if an offending module is
+unloaded, the tainted value remains to indicate that the kernel is not
+trustworthy.