linux/init/Kconfig, branch v4.0

Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

2015-02-19T18:36:45Z

Pull kconfig updates from Michal Marek: "Yann E Morin was supposed to take over kconfig maintainership, but this hasn't happened. So I'm sending a few kconfig patches that I collected: - Fix for missing va_end in kconfig - merge_config.sh displays used if given too few arguments - s/boolean/bool/ in Kconfig files for consistency, with the plan to only support bool in the future" * 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: kconfig: use va_end to match corresponding va_start merge_config.sh: Display usage if given too few arguments kconfig: use bool instead of boolean for type definition attributes

Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

2015-02-19T18:31:37Z

Pull misc kbuild changes from Michal Marek: "Just a few non-critical kbuild changes: - builddeb adds the actual distribution name in the changelog - documentation fixes" * 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: kbuild: trivial - fix the help doc of CONFIG_CC_OPTIMIZE_FOR_SIZE kbuild: Update documentation of clean-files and clean-dirs builddeb: Try to determine distribution builddeb: Update year and git repository URL in debian/copyright

init: remove CONFIG_INIT_FALLBACK

2015-02-14T05:21:42Z

CONFIG_INIT_FALLBACK adds config bloat without an obvious use case that makes it worth keeping around. Delete it. Signed-off-by: Andy Lutomirski Cc: Rusty Russell Cc: Chuck Ebbert Cc: Frank Rowand Reviewed-by: Josh Triplett Cc: Randy Dunlap Cc: Rob Landley Cc: Shuah Khan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge branches 'doc.2015.01.07a', 'fixes.2015.01.15a', 'preempt.2015.01.06a', 'srcu.2015.01.06a', 'stall.2015.01.16a' and 'torture.2015.01.11a' into HEAD

2015-01-16T07:34:34Z

doc.2015.01.07a: Documentation updates. fixes.2015.01.15a: Miscellaneous fixes. preempt.2015.01.06a: Changes to handling of lists of preempted tasks. srcu.2015.01.06a: SRCU updates. stall.2015.01.16a: RCU CPU stall-warning updates and fixes. torture.2015.01.11a: RCU torture-test updates and fixes.

rcu: Optionally run grace-period kthreads at real-time priority

2015-01-16T07:25:04Z

Recent testing has shown that under heavy load, running RCU's grace-period kthreads at real-time priority can improve performance (according to 0day test robot) and reduce the incidence of RCU CPU stall warnings. However, most systems do just fine with the default non-realtime priorities for these kthreads, and it does not make sense to expose the entire user base to any risk stemming from this change, given that this change is of use only to a few users running extremely heavy workloads. Therefore, this commit allows users to specify realtime priorities for the grace-period kthreads, but leaves them running SCHED_OTHER by default. The realtime priority may be specified at build time via the RCU_KTHREAD_PRIO Kconfig parameter, or at boot time via the rcutree.kthread_prio parameter. Either way, 0 says to continue the default SCHED_OTHER behavior and values from 1-99 specify that priority of SCHED_FIFO behavior. Note that a value of 0 is not permitted when the RCU_BOOST Kconfig parameter is specified. Signed-off-by: Paul E. McKenney

kbuild: trivial - fix the help doc of CONFIG_CC_OPTIMIZE_FOR_SIZE

2015-01-08T13:53:50Z

Other than GCC, we have another choice, Clang for building the kernel these days. It seems better to say "compiler" rather than "gcc". Signed-off-by: Masahiro Yamada Signed-off-by: Michal Marek

kconfig: use bool instead of boolean for type definition attributes

2015-01-07T12:08:04Z

Support for keyword 'boolean' will be dropped later on. No functional change. Reference: http://lkml.kernel.org/r/cover.1418003065.git.cj@linux.com Signed-off-by: Christoph Jaeger Signed-off-by: Michal Marek

rcu: Make SRCU optional by using CONFIG_SRCU

2015-01-06T19:04:29Z

SRCU is not necessary to be compiled by default in all cases. For tinification efforts not compiling SRCU unless necessary is desirable. The current patch tries to make compiling SRCU optional by introducing a new Kconfig option CONFIG_SRCU which is selected when any of the components making use of SRCU are selected. If we do not select CONFIG_SRCU, srcu.o will not be compiled at all. text data bss dec hex filename 2007 0 0 2007 7d7 kernel/rcu/srcu.o Size of arch/powerpc/boot/zImage changes from text data bss dec hex filename 831552 64180 23944 919676 e087c arch/powerpc/boot/zImage : before 829504 64180 23952 917636 e0084 arch/powerpc/boot/zImage : after so the savings are about ~2000 bytes. Signed-off-by: Pranith Kumar CC: Paul E. McKenney CC: Josh Triplett CC: Lai Jiangshan Signed-off-by: Paul E. McKenney [ paulmck: resolve conflict due to removal of arch/ia64/kvm/Kconfig. ]

rcu: Remove "select IRQ_WORK" from config TREE_RCU

2015-01-06T19:01:17Z

The 48a7639ce80c ("rcu: Make callers awaken grace-period kthread") removed the irq_work_queue(), so the TREE_RCU doesn't need irq work any more. This commit therefore updates RCU's Kconfig and Signed-off-by: Lai Jiangshan Signed-off-by: Paul E. McKenney

init: allow CONFIG_INIT_FALLBACK=n to disable defaults if init= fails

2014-12-11T01:41:12Z

If a user puts init=/whatever on the command line and /whatever can't be run, then the kernel will try a few default options before giving up. If init=/whatever came from a bootloader prompt, then this is unexpected but probably harmless. On the other hand, if it comes from a script (e.g. a tool like virtme or perhaps a future kselftest script), then the fallbacks are likely to exist, but they'll do the wrong thing. For example, they might unexpectedly invoke systemd. This adds a config option CONFIG_INIT_FALLBACK. If unset, then a failure to run the specified init= process be fatal. The tentative plan is to remove CONFIG_INIT_FALLBACK for 3.20. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andy Lutomirski Cc: Rob Landley Cc: Chuck Ebbert Cc: Randy Dunlap Cc: Shuah Khan Cc: Frank Rowand Cc: Josh Triplett Acked-by: Rusty Russell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds