encrypted-keys: fix rcu and sparse messages

[mirror_ubuntu-bionic-kernel.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 73baff1e0c70393db33a403c3d06a5aaae9ba22d..b29f3c416296ef880203a02c1d9b8c707f09206a 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -628,6 +628,25 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        no_debug_objects
                        [KNL] Disable object debugging
 
+       debug_guardpage_minorder=
+                       [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this
+                       parameter allows control of the order of pages that will
+                       be intentionally kept free (and hence protected) by the
+                       buddy allocator. Bigger value increase the probability
+                       of catching random memory corruption, but reduce the
+                       amount of memory for normal system use. The maximum
+                       possible value is MAX_ORDER/2.  Setting this parameter
+                       to 1 or 2 should be enough to identify most random
+                       memory corruption problems caused by bugs in kernel or
+                       driver code when a CPU writes to (or reads from) a
+                       random memory location. Note that there exists a class
+                       of memory corruptions problems caused by buggy H/W or
+                       F/W or by drivers badly programing DMA (basically when
+                       memory is written at bus level and the CPU MMU is
+                       bypassed) which are not detectable by
+                       CONFIG_DEBUG_PAGEALLOC, hence this option will not help
+                       tracking down these problems.
+
        debugpat        [X86] Enable PAT debugging
 
        decnet.addr=    [HW,NET]
@@ -1805,6 +1824,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        nomfgpt         [X86-32] Disable Multi-Function General Purpose
                        Timer usage (for AMD Geode machines).
 
+       nonmi_ipi       [X86] Disable using NMI IPIs during panic/reboot to
+                       shutdown the other cpus.  Instead use the REBOOT_VECTOR
+                       irq.
+
        nopat           [X86] Disable PAT (page attribute table extension of
                        pagetables) support.
 
@@ -2376,6 +2399,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        slram=          [HW,MTD]
 
+       slab_max_order= [MM, SLAB]
+                       Determines the maximum allowed order for slabs.
+                       A high setting may cause OOMs due to memory
+                       fragmentation.  Defaults to 1 for systems with
+                       more than 32MB of RAM, 0 otherwise.
+
        slub_debug[=options[,slabs]]    [MM, SLUB]
                        Enabling slub_debug allows one to determine the
                        culprit if slab objects become corrupted. Enabling
@@ -2446,6 +2475,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        stacktrace      [FTRACE]
                        Enabled the stack tracer on boot up.
 
+       stacktrace_filter=[function-list]
+                       [FTRACE] Limit the functions that the stack tracer
+                       will trace at boot up. function-list is a comma separated
+                       list of functions. This list can be changed at run
+                       time by the stack_trace_filter file in the debugfs
+                       tracing directory. Note, this enables stack tracing
+                       and the stacktrace above is not needed.
+
        sti=            [PARISC,HW]
                        Format: <num>
                        Set the STI (builtin display/keyboard on the HP-PARISC