Merge branch 'fixes-2.6.39' into for-2.6.40

Author: htejun

Documentation/ABI/testing/sysfs-bus-pci-devices-cciss

@@ -59,3 +59,15 @@ Kernel Version: 2.6.31
 Contact:	iss_storagedev@hp.com
 Description:	Displays the usage count (number of opens) of logical drive Y
 		of controller X.
+
+Where:		/sys/bus/pci/devices/<dev>/ccissX/resettable
+Date:		February 2011
+Kernel Version:	2.6.38
+Contact:	iss_storagedev@hp.com
+Description:	Value of 1 indicates the controller can honor the reset_devices
+		kernel parameter.  Value of 0 indicates reset_devices cannot be
+		honored.  This is to allow, for example, kexec tools to be able
+		to warn the user if they designate an unresettable device as
+		a dump device, as kdump requires resetting the device in order
+		to work reliably.
+

Documentation/ABI/testing/sysfs-fs-ext4

@@ -48,7 +48,7 @@ Description:
 		 will have its blocks allocated out of its own unique
 		 preallocation pool.
 
-What:		/sys/fs/ext4/<disk>/inode_readahead
+What:		/sys/fs/ext4/<disk>/inode_readahead_blks
 Date:		March 2008
 Contact:	"Theodore Ts'o" <tytso@mit.edu>
 Description:
@@ -85,7 +85,14 @@ Date:		June 2008
 Contact:	"Theodore Ts'o" <tytso@mit.edu>
 Description:
 		Tuning parameter which (if non-zero) controls the goal
-		inode used by the inode allocator in p0reference to
-		all other allocation hueristics.  This is intended for
+		inode used by the inode allocator in preference to
+		all other allocation heuristics.  This is intended for
 		debugging use only, and should be 0 on production
 		systems.
+
+What:		/sys/fs/ext4/<disk>/max_writeback_mb_bump
+Date:		September 2009
+Contact:	"Theodore Ts'o" <tytso@mit.edu>
+Description:
+		The maximum number of megabytes the writeback code will
+		try to write out before move on to another inode.

Documentation/DocBook/Makefile

@@ -55,7 +55,6 @@ mandocs: $(MAN)
 build_images = mkdir -p $(objtree)/Documentation/DocBook/media/ && \
 	       cp $(srctree)/Documentation/DocBook/dvb/*.png \
 	          $(srctree)/Documentation/DocBook/v4l/*.gif \
-	          $(srctree)/Documentation/DocBook/v4l/*.png \
 		  $(objtree)/Documentation/DocBook/media/
 
 xmldoclinks:

Documentation/DocBook/rapidio.tmpl

@@ -133,7 +133,6 @@
 !Idrivers/rapidio/rio-sysfs.c
      </sect1>
      <sect1 id="PPC32_support"><title>PPC32 support</title>
-!Earch/powerpc/sysdev/fsl_rio.c
 !Iarch/powerpc/sysdev/fsl_rio.c
      </sect1>
   </chapter>

Documentation/development-process/1.Intro

@@ -56,13 +56,13 @@ information on kernel development.
 
 1.2: WHAT THIS DOCUMENT IS ABOUT
 
-The Linux kernel, at over 6 million lines of code and well over 1000 active
-contributors, is one of the largest and most active free software projects
-in existence.  Since its humble beginning in 1991, this kernel has evolved
-into a best-of-breed operating system component which runs on pocket-sized
-digital music players, desktop PCs, the largest supercomputers in
-existence, and all types of systems in between.  It is a robust, efficient,
-and scalable solution for almost any situation.
+The Linux kernel, at over 8 million lines of code and well over 1000
+contributors to each release, is one of the largest and most active free
+software projects in existence.  Since its humble beginning in 1991, this
+kernel has evolved into a best-of-breed operating system component which
+runs on pocket-sized digital music players, desktop PCs, the largest
+supercomputers in existence, and all types of systems in between.  It is a
+robust, efficient, and scalable solution for almost any situation.
 
 With the growth of Linux has come an increase in the number of developers
 (and companies) wishing to participate in its development.  Hardware
@@ -115,7 +115,7 @@ This document was written by Jonathan Corbet, corbet@lwn.net.  It has been
 improved by comments from Johannes Berg, James Berry, Alex Chiang, Roland
 Dreier, Randy Dunlap, Jake Edge, Jiri Kosina, Matt Mackall, Arthur Marsh,
 Amanda McPherson, Andrew Morton, Andrew Price, Tsugikazu Shibata, and
-Jochen Voß. 
+Jochen Voß.
 
 This work was supported by the Linux Foundation; thanks especially to
 Amanda McPherson, who saw the value of this effort and made it all happen.
@@ -221,7 +221,7 @@ include:
 - Everything that was said above about code review applies doubly to
   closed-source code.  Since this code is not available at all, it cannot
   have been reviewed by the community and will, beyond doubt, have serious
-  problems. 
+  problems.
 
 Makers of embedded systems, in particular, may be tempted to disregard much
 of what has been said in this section in the belief that they are shipping

Documentation/development-process/2.Process

@@ -14,16 +14,15 @@ The kernel developers use a loosely time-based release process, with a new
 major kernel release happening every two or three months.  The recent
 release history looks like this:
 
-	2.6.26	July 13, 2008
-	2.6.25	April 16, 2008
-	2.6.24	January 24, 2008
-	2.6.23	October 9, 2007
-	2.6.22	July 8, 2007
-	2.6.21	April 25, 2007
-	2.6.20	February 4, 2007
+	2.6.38	March 14, 2011
+	2.6.37	January 4, 2011
+	2.6.36	October 20, 2010
+	2.6.35	August 1, 2010
+	2.6.34	May 15, 2010
+	2.6.33	February 24, 2010
 
 Every 2.6.x release is a major kernel release with new features, internal
-API changes, and more.  A typical 2.6 release can contain over 10,000
+API changes, and more.  A typical 2.6 release can contain nearly 10,000
 changesets with changes to several hundred thousand lines of code.  2.6 is
 thus the leading edge of Linux kernel development; the kernel uses a
 rolling development model which is continually integrating major changes.
@@ -42,13 +41,13 @@ merge window do not come out of thin air; they have been collected, tested,
 and staged ahead of time.  How that process works will be described in
 detail later on).
 
-The merge window lasts for two weeks.  At the end of this time, Linus
-Torvalds will declare that the window is closed and release the first of
-the "rc" kernels.  For the kernel which is destined to be 2.6.26, for
-example, the release which happens at the end of the merge window will be
-called 2.6.26-rc1.  The -rc1 release is the signal that the time to merge
-new features has passed, and that the time to stabilize the next kernel has
-begun.
+The merge window lasts for approximately two weeks.  At the end of this
+time, Linus Torvalds will declare that the window is closed and release the
+first of the "rc" kernels.  For the kernel which is destined to be 2.6.40,
+for example, the release which happens at the end of the merge window will
+be called 2.6.40-rc1.  The -rc1 release is the signal that the time to
+merge new features has passed, and that the time to stabilize the next
+kernel has begun.
 
 Over the next six to ten weeks, only patches which fix problems should be
 submitted to the mainline.  On occasion a more significant change will be
@@ -66,28 +65,27 @@ will get up to somewhere between -rc6 and -rc9 before the kernel is
 considered to be sufficiently stable and the final 2.6.x release is made.
 At that point the whole process starts over again.
 
-As an example, here is how the 2.6.25 development cycle went (all dates in
-2008): 
-
-	January 24	2.6.24 stable release
-	February 10	2.6.25-rc1, merge window closes
-	February 15	2.6.25-rc2
-	February 24	2.6.25-rc3
-	March 4	 	2.6.25-rc4
-	March 9		2.6.25-rc5
-	March 16	2.6.25-rc6
-	March 25	2.6.25-rc7
-	April 1		2.6.25-rc8
-	April 11	2.6.25-rc9
-	April 16	2.6.25 stable release
+As an example, here is how the 2.6.38 development cycle went (all dates in
+2011):
+
+	January 4	2.6.37 stable release
+	January 18	2.6.38-rc1, merge window closes
+	January 21	2.6.38-rc2
+	February 1	2.6.38-rc3
+	February 7	2.6.38-rc4
+	February 15	2.6.38-rc5
+	February 21	2.6.38-rc6
+	March 1		2.6.38-rc7
+	March 7		2.6.38-rc8
+	March 14	2.6.38 stable release
 
 How do the developers decide when to close the development cycle and create
 the stable release?  The most significant metric used is the list of
 regressions from previous releases.  No bugs are welcome, but those which
 break systems which worked in the past are considered to be especially
 serious.  For this reason, patches which cause regressions are looked upon
 unfavorably and are quite likely to be reverted during the stabilization
-period. 
+period.
 
 The developers' goal is to fix all known regressions before the stable
 release is made.  In the real world, this kind of perfection is hard to
@@ -99,26 +97,34 @@ kernels go out with a handful of known regressions though, hopefully, none
 of them are serious.
 
 Once a stable release is made, its ongoing maintenance is passed off to the
-"stable team," currently comprised of Greg Kroah-Hartman and Chris Wright.
-The stable team will release occasional updates to the stable release using
-the 2.6.x.y numbering scheme.  To be considered for an update release, a
-patch must (1) fix a significant bug, and (2) already be merged into the
-mainline for the next development kernel.  Continuing our 2.6.25 example,
-the history (as of this writing) is:
-
-	May 1		2.6.25.1
-	May 6		2.6.25.2 
-	May 9		2.6.25.3 
-	May 15		2.6.25.4
-	June 7		2.6.25.5
-	June 9		2.6.25.6
-	June 16		2.6.25.7
-	June 21		2.6.25.8
-	June 24		2.6.25.9
-
-Stable updates for a given kernel are made for approximately six months;
-after that, the maintenance of stable releases is solely the responsibility
-of the distributors which have shipped that particular kernel.
+"stable team," currently consisting of Greg Kroah-Hartman.  The stable team
+will release occasional updates to the stable release using the 2.6.x.y
+numbering scheme.  To be considered for an update release, a patch must (1)
+fix a significant bug, and (2) already be merged into the mainline for the
+next development kernel.  Kernels will typically receive stable updates for
+a little more than one development cycle past their initial release.  So,
+for example, the 2.6.36 kernel's history looked like:
+
+	October 10	2.6.36 stable release
+	November 22	2.6.36.1
+	December 9	2.6.36.2
+	January 7	2.6.36.3
+	February 17	2.6.36.4
+
+2.6.36.4 was the final stable update for the 2.6.36 release.
+
+Some kernels are designated "long term" kernels; they will receive support
+for a longer period.  As of this writing, the current long term kernels
+and their maintainers are:
+
+	2.6.27	Willy Tarreau		(Deep-frozen stable kernel)
+	2.6.32	Greg Kroah-Hartman
+	2.6.35	Andi Kleen		(Embedded flag kernel)
+
+The selection of a kernel for long-term support is purely a matter of a
+maintainer having the need and the time to maintain that release.  There
+are no known plans for long-term support for any specific upcoming
+release.
 
 
 2.2: THE LIFECYCLE OF A PATCH
@@ -130,7 +136,7 @@ each patch implements a change which is desirable to have in the mainline.
 This process can happen quickly for minor fixes, or, in the case of large
 and controversial changes, go on for years.  Much developer frustration
 comes from a lack of understanding of this process or from attempts to
-circumvent it.  
+circumvent it.
 
 In the hopes of reducing that frustration, this document will describe how
 a patch gets into the kernel.  What follows below is an introduction which
@@ -193,8 +199,8 @@ involved.
 2.3: HOW PATCHES GET INTO THE KERNEL
 
 There is exactly one person who can merge patches into the mainline kernel
-repository: Linus Torvalds.  But, of the over 12,000 patches which went
-into the 2.6.25 kernel, only 250 (around 2%) were directly chosen by Linus
+repository: Linus Torvalds.  But, of the over 9,500 patches which went
+into the 2.6.38 kernel, only 112 (around 1.3%) were directly chosen by Linus
 himself.  The kernel project has long since grown to a size where no single
 developer could possibly inspect and select every patch unassisted.  The
 way the kernel developers have addressed this growth is through the use of
@@ -229,7 +235,7 @@ first in trees dedicated to network device drivers, wireless networking,
 etc.  This chain of repositories can be arbitrarily long, though it rarely
 exceeds two or three links.  Since each maintainer in the chain trusts
 those managing lower-level trees, this process is known as the "chain of
-trust." 
+trust."
 
 Clearly, in a system like this, getting patches into the kernel depends on
 finding the right maintainer.  Sending patches directly to Linus is not
@@ -254,7 +260,7 @@ The answer comes in the form of -next trees, where subsystem trees are
 collected for testing and review.  The older of these trees, maintained by
 Andrew Morton, is called "-mm" (for memory management, which is how it got
 started).  The -mm tree integrates patches from a long list of subsystem
-trees; it also has some patches aimed at helping with debugging.  
+trees; it also has some patches aimed at helping with debugging.
 
 Beyond that, -mm contains a significant collection of patches which have
 been selected by Andrew directly.  These patches may have been posted on a
@@ -264,8 +270,8 @@ subsystem tree of last resort; if there is no other obvious path for a
 patch into the mainline, it is likely to end up in -mm.  Miscellaneous
 patches which accumulate in -mm will eventually either be forwarded on to
 an appropriate subsystem tree or be sent directly to Linus.  In a typical
-development cycle, approximately 10% of the patches going into the mainline
-get there via -mm.
+development cycle, approximately 5-10% of the patches going into the
+mainline get there via -mm.
 
 The current -mm patch is available in the "mmotm" (-mm of the moment)
 directory at:
@@ -275,7 +281,7 @@ directory at:
 Use of the MMOTM tree is likely to be a frustrating experience, though;
 there is a definite chance that it will not even compile.
 
-The other -next tree, started more recently, is linux-next, maintained by
+The primary tree for next-cycle patch merging is linux-next, maintained by
 Stephen Rothwell.  The linux-next tree is, by design, a snapshot of what
 the mainline is expected to look like after the next merge window closes.
 Linux-next trees are announced on the linux-kernel and linux-next mailing
@@ -287,41 +293,38 @@ Some information about linux-next has been gathered at:
 
 	http://linux.f-seidel.de/linux-next/pmwiki/
 
-How the linux-next tree will fit into the development process is still
-changing.  As of this writing, the first full development cycle involving
-linux-next (2.6.26) is coming to an end; thus far, it has proved to be a
-valuable resource for finding and fixing integration problems before the
-beginning of the merge window.  See http://lwn.net/Articles/287155/ for
-more information on how linux-next has worked to set up the 2.6.27 merge
-window.
-
-Some developers have begun to suggest that linux-next should be used as the
-target for future development as well.  The linux-next tree does tend to be
-far ahead of the mainline and is more representative of the tree into which
-any new work will be merged.  The downside to this idea is that the
-volatility of linux-next tends to make it a difficult development target.
-See http://lwn.net/Articles/289013/ for more information on this topic, and
-stay tuned; much is still in flux where linux-next is involved.
+Linux-next has become an integral part of the kernel development process;
+all patches merged during a given merge window should really have found
+their way into linux-next some time before the merge window opens.
+
 
 2.4.1: STAGING TREES
 
-The kernel source tree now contains the drivers/staging/ directory, where
+The kernel source tree contains the drivers/staging/ directory, where
 many sub-directories for drivers or filesystems that are on their way to
 being added to the kernel tree live.  They remain in drivers/staging while
 they still need more work; once complete, they can be moved into the
 kernel proper.  This is a way to keep track of drivers that aren't
 up to Linux kernel coding or quality standards, but people may want to use
 them and track development.
 
-Greg Kroah-Hartman currently (as of 2.6.36) maintains the staging tree.
-Drivers that still need work are sent to him, with each driver having
-its own subdirectory in drivers/staging/.  Along with the driver source
-files, a TODO file should be present in the directory as well.  The TODO
-file lists the pending work that the driver needs for acceptance into
-the kernel proper, as well as a list of people that should be Cc'd for any
-patches to the driver.  Staging drivers that don't currently build should
-have their config entries depend upon CONFIG_BROKEN.  Once they can
-be successfully built without outside patches, CONFIG_BROKEN can be removed.
+Greg Kroah-Hartman currently maintains the staging tree.  Drivers that
+still need work are sent to him, with each driver having its own
+subdirectory in drivers/staging/.  Along with the driver source files, a
+TODO file should be present in the directory as well.  The TODO file lists
+the pending work that the driver needs for acceptance into the kernel
+proper, as well as a list of people that should be Cc'd for any patches to
+the driver.  Current rules require that drivers contributed to staging
+must, at a minimum, compile properly.
+
+Staging can be a relatively easy way to get new drivers into the mainline
+where, with luck, they will come to the attention of other developers and
+improve quickly.  Entry into staging is not the end of the story, though;
+code in staging which is not seeing regular progress will eventually be
+removed.  Distributors also tend to be relatively reluctant to enable
+staging drivers.  So staging is, at best, a stop on the way toward becoming
+a proper mainline driver.
+
 
 2.5: TOOLS
 
@@ -347,11 +350,7 @@ page at:
 
 	http://git-scm.com/
 
-That page has pointers to documentation and tutorials.  One should be
-aware, in particular, of the Kernel Hacker's Guide to git, which has
-information specific to kernel development:
-
-	http://linux.yyz.us/git-howto.html
+That page has pointers to documentation and tutorials.
 
 Among the kernel developers who do not use git, the most popular choice is
 almost certainly Mercurial:
@@ -408,7 +407,7 @@ There are a few hints which can help with linux-kernel survival:
   important to filter on both the topic of interest (though note that
   long-running conversations can drift away from the original subject
   without changing the email subject line) and the people who are
-  participating.  
+  participating.
 
 - Do not feed the trolls.  If somebody is trying to stir up an angry
   response, ignore them.