Three fixes for the docs build, including removing an annoying warning on

"make help" if sphinx isn't present.
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Merge tag 'doc-4.8-fixes' of git://git.lwn.net/linux

Pull documentation fixes from Jonathan Corbet:
 "Three fixes for the docs build, including removing an annoying warning
  on 'make help' if sphinx isn't present"

* tag 'doc-4.8-fixes' of git://git.lwn.net/linux:
  DocBook: use DOCBOOKS="" to ignore DocBooks instead of IGNORE_DOCBOOKS=1
  Documenation: update cgroup's document path
  Documentation/sphinx: do not warn about missing tools in 'make help'

Documentation/DocBook/Makefile

@@ -6,8 +6,6 @@
 # To add a new book the only step required is to add the book to the
 # list of DOCBOOKS.
 
-ifeq ($(IGNORE_DOCBOOKS),)
-
 DOCBOOKS := z8530book.xml device-drivers.xml \
 	    kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
 	    writing_usb_driver.xml networking.xml \
@@ -19,6 +17,14 @@ DOCBOOKS := z8530book.xml device-drivers.xml \
 	    tracepoint.xml w1.xml \
 	    writing_musb_glue_layer.xml crypto-API.xml iio.xml
 
+ifeq ($(DOCBOOKS),)
+
+# Skip DocBook build if the user explicitly requested no DOCBOOKS.
+.DEFAULT:
+	@echo "  SKIP    DocBook $@ target (DOCBOOKS=\"\" specified)."
+
+else
+
 ###
 # The build process is as follows (targets):
 #              (xmldocs) [by docproc]
@@ -214,16 +220,7 @@ silent_gen_xml = :
 	       -e "s/>/\\>/g";     \
 	   echo "</programlisting>")  > $@
 
-else
-
-htmldocs:
-pdfdocs:
-psdocs:
-xmldocs:
-installmandocs:
-
-endif # IGNORE_DOCBOOKS
-
+endif # DOCBOOKS=""
 
 ###
 # Help targets as used by the top-level makefile
@@ -240,7 +237,7 @@ dochelp:
 	@echo  '  make DOCBOOKS="s1.xml s2.xml" [target] Generate only docs s1.xml s2.xml'
 	@echo  '  valid values for DOCBOOKS are: $(DOCBOOKS)'
 	@echo
-	@echo  "  make IGNORE_DOCBOOKS=1 [target] Don't generate docs from Docbook"
+	@echo  "  make DOCBOOKS=\"\" [target] Don't generate docs from Docbook"
 	@echo  '     This is useful to generate only the ReST docs (Sphinx)'
 
 

Documentation/Makefile.sphinx

@@ -67,6 +67,8 @@ installmandocs:
 cleandocs:
 	$(Q)rm -rf $(BUILDDIR)
 
+endif # HAVE_SPHINX
+
 dochelp:
 	@echo  ' Linux kernel internal documentation in different formats (Sphinx):'
 	@echo  '  htmldocs        - HTML'
@@ -74,5 +76,3 @@ dochelp:
 	@echo  '  epubdocs        - EPUB'
 	@echo  '  xmldocs         - XML'
 	@echo  '  cleandocs       - clean all generated files'
-
-endif # HAVE_SPHINX

Documentation/cgroup-v1/cgroups.txt

@@ -2,7 +2,7 @@
 				-------
 
 Written by Paul Menage <menage@google.com> based on
-Documentation/cgroups/cpusets.txt
+Documentation/cgroup-v1/cpusets.txt
 
 Original copyright statements from cpusets.txt:
 Portions Copyright (C) 2004 BULL SA.
@@ -72,7 +72,7 @@ On their own, the only use for cgroups is for simple job
 tracking. The intention is that other subsystems hook into the generic
 cgroup support to provide new attributes for cgroups, such as
 accounting/limiting the resources which processes in a cgroup can
-access. For example, cpusets (see Documentation/cgroups/cpusets.txt) allow
+access. For example, cpusets (see Documentation/cgroup-v1/cpusets.txt) allow
 you to associate a set of CPUs and a set of memory nodes with the
 tasks in each cgroup.
 

Documentation/cgroup-v1/cpusets.txt

@@ -48,7 +48,7 @@ hooks, beyond what is already present, required to manage dynamic
 job placement on large systems.
 
 Cpusets use the generic cgroup subsystem described in
-Documentation/cgroups/cgroups.txt.
+Documentation/cgroup-v1/cgroups.txt.
 
 Requests by a task, using the sched_setaffinity(2) system call to
 include CPUs in its CPU affinity mask, and using the mbind(2) and

Documentation/cgroup-v1/memcg_test.txt

@@ -6,7 +6,7 @@ Because VM is getting complex (one of reasons is memcg...), memcg's behavior
 is complex. This is a document for memcg's internal behavior.
 Please note that implementation details can be changed.
 
-(*) Topics on API should be in Documentation/cgroups/memory.txt)
+(*) Topics on API should be in Documentation/cgroup-v1/memory.txt)
 
 0. How to record usage ?
    2 objects are used.
@@ -256,7 +256,7 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y.
 
 	You can see charges have been moved by reading *.usage_in_bytes or
 	memory.stat of both A and B.
-	See 8.2 of Documentation/cgroups/memory.txt to see what value should be
+	See 8.2 of Documentation/cgroup-v1/memory.txt to see what value should be
 	written to move_charge_at_immigrate.
 
  9.10 Memory thresholds

Documentation/filesystems/tmpfs.txt

@@ -98,7 +98,7 @@ A memory policy with a valid NodeList will be saved, as specified, for
 use at file creation time.  When a task allocates a file in the file
 system, the mount option memory policy will be applied with a NodeList,
 if any, modified by the calling task's cpuset constraints
-[See Documentation/cgroups/cpusets.txt] and any optional flags, listed
+[See Documentation/cgroup-v1/cpusets.txt] and any optional flags, listed
 below.  If the resulting NodeLists is the empty set, the effective memory
 policy for the file will revert to "default" policy.
 

Documentation/kernel-parameters.txt

@@ -3589,7 +3589,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
 	relax_domain_level=
 			[KNL, SMP] Set scheduler's default relax_domain_level.
-			See Documentation/cgroups/cpusets.txt.
+			See Documentation/cgroup-v1/cpusets.txt.
 
 	relative_sleep_states=
 			[SUSPEND] Use sleep state labeling where the deepest
@@ -3918,7 +3918,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 	swapaccount=[0|1]
 			[KNL] Enable accounting of swap in memory resource
 			controller if no parameter or 1 is given or disable
-			it if 0 is given (See Documentation/cgroups/memory.txt)
+			it if 0 is given (See Documentation/cgroup-v1/memory.txt)
 
 	swiotlb=	[ARM,IA-64,PPC,MIPS,X86]
 			Format: { <int> | force }

Documentation/kernel-per-CPU-kthreads.txt

@@ -10,7 +10,7 @@ REFERENCES
 
 o	Documentation/IRQ-affinity.txt:  Binding interrupts to sets of CPUs.
 
-o	Documentation/cgroups:  Using cgroups to bind tasks to sets of CPUs.
+o	Documentation/cgroup-v1:  Using cgroups to bind tasks to sets of CPUs.
 
 o	man taskset:  Using the taskset command to bind tasks to sets
 	of CPUs.

Documentation/scheduler/sched-deadline.txt

@@ -431,7 +431,7 @@ CONTENTS
 
  -deadline tasks cannot have an affinity mask smaller that the entire
  root_domain they are created on. However, affinities can be specified
- through the cpuset facility (Documentation/cgroups/cpusets.txt).
+ through the cpuset facility (Documentation/cgroup-v1/cpusets.txt).
 
 5.1 SCHED_DEADLINE and cpusets HOWTO
 ------------------------------------

Documentation/scheduler/sched-design-CFS.txt

@@ -215,7 +215,7 @@ SCHED_BATCH) tasks.
 
    These options need CONFIG_CGROUPS to be defined, and let the administrator
    create arbitrary groups of tasks, using the "cgroup" pseudo filesystem.  See
-   Documentation/cgroups/cgroups.txt for more information about this filesystem.
+   Documentation/cgroup-v1/cgroups.txt for more information about this filesystem.
 
 When CONFIG_FAIR_GROUP_SCHED is defined, a "cpu.shares" file is created for each
 group created using the pseudo filesystem.  See example steps below to create

Documentation/scheduler/sched-rt-group.txt

@@ -133,7 +133,7 @@ This uses the cgroup virtual file system and "<cgroup>/cpu.rt_runtime_us"
 to control the CPU time reserved for each control group.
 
 For more information on working with control groups, you should read
-Documentation/cgroups/cgroups.txt as well.
+Documentation/cgroup-v1/cgroups.txt as well.
 
 Group settings are checked against the following limits in order to keep the
 configuration schedulable:

Documentation/vm/numa

@@ -63,7 +63,7 @@ nodes.  Each emulated node will manage a fraction of the underlying cells'
 physical memory.  NUMA emluation is useful for testing NUMA kernel and
 application features on non-NUMA platforms, and as a sort of memory resource
 management mechanism when used together with cpusets.
-[see Documentation/cgroups/cpusets.txt]
+[see Documentation/cgroup-v1/cpusets.txt]
 
 For each node with memory, Linux constructs an independent memory management
 subsystem, complete with its own free page lists, in-use page lists, usage
@@ -113,7 +113,7 @@ allocation behavior using Linux NUMA memory policy.
 
 System administrators can restrict the CPUs and nodes' memories that a non-
 privileged user can specify in the scheduling or NUMA commands and functions
-using control groups and CPUsets.  [see Documentation/cgroups/cpusets.txt]
+using control groups and CPUsets.  [see Documentation/cgroup-v1/cpusets.txt]
 
 On architectures that do not hide memoryless nodes, Linux will include only
 zones [nodes] with memory in the zonelists.  This means that for a memoryless

Documentation/vm/numa_memory_policy.txt

@@ -9,7 +9,7 @@ document attempts to describe the concepts and APIs of the 2.6 memory policy
 support.
 
 Memory policies should not be confused with cpusets
-(Documentation/cgroups/cpusets.txt)
+(Documentation/cgroup-v1/cpusets.txt)
 which is an administrative mechanism for restricting the nodes from which
 memory may be allocated by a set of processes. Memory policies are a
 programming interface that a NUMA-aware application can take advantage of.  When

Documentation/vm/page_migration

@@ -38,7 +38,7 @@ locations.
 Larger installations usually partition the system using cpusets into
 sections of nodes. Paul Jackson has equipped cpusets with the ability to
 move pages when a task is moved to another cpuset (See
-Documentation/cgroups/cpusets.txt).
+Documentation/cgroup-v1/cpusets.txt).
 Cpusets allows the automation of process locality. If a task is moved to
 a new cpuset then also all its pages are moved with it so that the
 performance of the process does not sink dramatically. Also the pages

Documentation/vm/unevictable-lru.txt

@@ -122,7 +122,7 @@ MEMORY CONTROL GROUP INTERACTION
 --------------------------------
 
 The unevictable LRU facility interacts with the memory control group [aka
-memory controller; see Documentation/cgroups/memory.txt] by extending the
+memory controller; see Documentation/cgroup-v1/memory.txt] by extending the
 lru_list enum.
 
 The memory controller data structure automatically gets a per-zone unevictable

Documentation/x86/x86_64/fake-numa-for-cpusets

@@ -8,7 +8,7 @@ assign them to cpusets and their attached tasks.  This is a way of limiting the
 amount of system memory that are available to a certain class of tasks.
 
 For more information on the features of cpusets, see
-Documentation/cgroups/cpusets.txt.
+Documentation/cgroup-v1/cpusets.txt.
 There are a number of different configurations you can use for your needs.  For
 more information on the numa=fake command line option and its various ways of
 configuring fake nodes, see Documentation/x86/x86_64/boot-options.txt.
@@ -33,7 +33,7 @@ A machine may be split as follows with "numa=fake=4*512," as reported by dmesg:
 	On node 3 totalpages: 131072
 
 Now following the instructions for mounting the cpusets filesystem from
-Documentation/cgroups/cpusets.txt, you can assign fake nodes (i.e. contiguous memory
+Documentation/cgroup-v1/cpusets.txt, you can assign fake nodes (i.e. contiguous memory
 address spaces) to individual cpusets:
 
 	[root@xroads /]# mkdir exampleset