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* cgroup, kthread: close race window where new kthreads can be migrated to ↵Tejun Heo2017-03-171-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | non-root cgroups Creation of a kthread goes through a couple interlocked stages between the kthread itself and its creator. Once the new kthread starts running, it initializes itself and wakes up the creator. The creator then can further configure the kthread and then let it start doing its job by waking it up. In this configuration-by-creator stage, the creator is the only one that can wake it up but the kthread is visible to userland. When altering the kthread's attributes from userland is allowed, this is fine; however, for cases where CPU affinity is critical, kthread_bind() is used to first disable affinity changes from userland and then set the affinity. This also prevents the kthread from being migrated into non-root cgroups as that can affect the CPU affinity and many other things. Unfortunately, the cgroup side of protection is racy. While the PF_NO_SETAFFINITY flag prevents further migrations, userland can win the race before the creator sets the flag with kthread_bind() and put the kthread in a non-root cgroup, which can lead to all sorts of problems including incorrect CPU affinity and starvation. This bug got triggered by userland which periodically tries to migrate all processes in the root cpuset cgroup to a non-root one. Per-cpu workqueue workers got caught while being created and ended up with incorrected CPU affinity breaking concurrency management and sometimes stalling workqueue execution. This patch adds task->no_cgroup_migration which disallows the task to be migrated by userland. kthreadd starts with the flag set making every child kthread start in the root cgroup with migration disallowed. The flag is cleared after the kthread finishes initialization by which time PF_NO_SETAFFINITY is set if the kthread should stay in the root cgroup. It'd be better to wait for the initialization instead of failing but I couldn't think of a way of implementing that without adding either a new PF flag, or sleeping and retrying from waiting side. Even if userland depends on changing cgroup membership of a kthread, it either has to be synchronized with kthread_create() or periodically repeat, so it's unlikely that this would break anything. v2: Switch to a simpler implementation using a new task_struct bit field suggested by Oleg. Signed-off-by: Tejun Heo <tj@kernel.org> Suggested-by: Oleg Nesterov <oleg@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Reported-and-debugged-by: Chris Mason <clm@fb.com> Cc: stable@vger.kernel.org # v4.3+ (we can't close the race on < v4.3) Signed-off-by: Tejun Heo <tj@kernel.org>
* sched/headers: Clean up <linux/sched.h>Ingo Molnar2017-03-031-571/+651
| | | | | | | | | | | | | | | | | | | | | | | | | Now that <linux/sched.h> dependencies have been sorted out, do various trivial cleanups: - remove unnecessary structure predeclarations - fix various typos - update comments where necessary - remove pointless comments - use consistent types - tabulate consistently - use a consistent comment style - clean up the header section a bit - use a consistent style of a single field per line - remove line-breaks where they make the code look worse - etc ... No change in functionality. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove #ifdefs from <linux/sched.h>Ingo Molnar2017-03-031-8/+4
| | | | | | | | | | We can remove two pairs of #ifdefs by defining structures in a smarter way. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove the <linux/topology.h> include from <linux/sched.h>Ingo Molnar2017-03-031-6/+1
| | | | | | | | | | | | | It's used only by a single (rarely used) inline function (task_node(p)), which we can move to <linux/sched/topology.h>. ( Add <linux/nodemask.h>, because we rely on that. ) Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <linux/magic.h> from <linux/sched/task_stack.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | | It's not used by any of the scheduler methods, but <linux/sched/task_stack.h> needs it to pick up STACK_END_MAGIC. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/core: Remove unused prefetch_stack()Ingo Molnar2017-03-031-6/+0
| | | | | | | | | | | | prefetch_stack() is defined by IA64, but not actually used anywhere anymore. Remove it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <linux/rculist.h> from <linux/sched.h>Ingo Molnar2017-03-031-1/+1
| | | | | | | | | | | We don't actually need the full rculist.h header anymore, include the smaller rcupdate.h header instead. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove the 'init_pid_ns' prototype from <linux/sched.h>Ingo Molnar2017-03-031-2/+0
| | | | | | | | | | pid.h already defines it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <linux/signal.h> from <linux/sched.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | | | Instead of including the full <linux/signal.h>, only include the types-only <linux/signal_types.h> header in <linux/sched.h>, to further decouple the scheduler header from the signal headers. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <linux/rwsem.h> from <linux/sched.h>Ingo Molnar2017-03-031-2/+0
| | | | | | | | | | | | | | | This is a stray header that is not needed by anything in sched.h, so remove it. Update files that relied on the stray inclusion. This reduces the size of the header dependency graph. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove the runqueue_is_locked() prototypeIngo Molnar2017-03-031-2/+0
| | | | | | | | | | Remove the runqueue_is_locked() prototype, the function does not exist anymore. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove the <linux/gfp.h> include from <linux/sched.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | This reduces sched.h header dependencies. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <linux/rtmutex.h> from <linux/sched.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | This reduces header dependencies. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <asm/ptrace.h> from <linux/sched.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | This reduces header dependencies. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <linux/cred.h> inclusion from <linux/sched.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | This reduces header dependencies and speeds up the build. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove <linux/cgroup-defs.h> from <linux/sched.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | | | | | | It's not used by anything in <linux/sched.h> anymore. This reduces the preprocessed size of <linux/sched.h> and speeds up the build a bit. Also fix code that implicitly relied on headers included by <linux/cgroup-defs.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove #include <linux/capability.h> from <linux/sched.h>Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | | The <linux/sched.h> header does not actually make use of any types or APIs defined in <linux/capability.h>, so remove its inclusion. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove unused 'task_can_switch_user()' prototypeIngo Molnar2017-03-031-3/+0
| | | | | | | | | | The function does not exist anymore. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the sched_exec() prototype to <linux/sched/task.h>Ingo Molnar2017-03-031-7/+0
| | | | | | | | | | | | | | sched_exec() better fits into the task lifetime APIs than into the core scheduler APIs. This reduces the size of <linux/sched.h> a bit. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the get_task_struct()/put_task_struct() and related APIs ↵Ingo Molnar2017-03-031-14/+0
| | | | | | | | | | | | | from <linux/sched.h> to <linux/sched/task.h> These belong into the task lifetime API header. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers, mm: Move 'struct tlbflush_unmap_batch' from <linux/sched.h> ↵Ingo Molnar2017-03-031-21/+0
| | | | | | | | | | | | | | | | to <linux/mm_types_task.h> Unclutter <linux/sched.h> some more. Also move the CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH condition inside the structure body definition, to remove a pair of #ifdefs from sched.h. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers, timekeeping: Move the timer tick function prototypes to ↵Ingo Molnar2017-03-031-1/+0
| | | | | | | | | | | | | <linux/timekeeping.h> Move the update_process_times() and xtime_update() prototypes to <linux/timekeeping.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move _init() prototypes from <linux/sched.h> to ↵Ingo Molnar2017-03-031-5/+0
| | | | | | | | | | | | | <linux/sched/init.h> trap_init() and cpu_init() belong into <linux/cpu.h>, sched_init*() into <linux/sched/init.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move exit_files() and exit_itimers() from <linux/sched.h> to ↵Ingo Molnar2017-03-031-4/+0
| | | | | | | | | | | | | <linux/sched/task.h> These two functions are task management related, not core scheduler APIs. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move kstack_end() from <linux/sched.h> to ↵Ingo Molnar2017-03-031-10/+0
| | | | | | | | | | | | | <linux/sched/task_stack.h> This is a task-stack related API, not core scheduler functionality. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers, vfs/execve: Move the do_execve*() prototypes from ↵Ingo Molnar2017-03-031-8/+0
| | | | | | | | | | | | | <linux/sched.h> to <linux/binfmts.h> These are not scheduler related. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move sched_info_on() and force_schedstat_enabled() from ↵Ingo Molnar2017-03-031-16/+0
| | | | | | | | | | | | | <linux/sched.h> to <linux/sched/stat.h> These APIs are not core scheduler but scheduler statistics related. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move cputime functionality from <linux/sched.h> and ↵Ingo Molnar2017-03-031-89/+0
| | | | | | | | | | | | | | | | | | | <linux/cputime.h> into <linux/sched/cputime.h> Move cputime related functionality out of <linux/sched.h>, as most code that includes <linux/sched.h> does not use that functionality. Move data types that are not included in task_struct directly to the signal definitions, into <linux/sched/signal.h>. Also merge the (small) existing <linux/cputime.h> header into <linux/sched/cputime.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the task_lock()/unlock() APIs to <linux/sched/task.h>Ingo Molnar2017-03-031-20/+0
| | | | | | | | | | | | | | The task_lock()/task_unlock() APIs are not realated to core scheduling, they are task lifetime APIs, i.e. they belong into <linux/sched/task.h>. Move them. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move 'init_task' and 'init_thread_union' from <linux/sched.h> ↵Ingo Molnar2017-03-031-3/+0
| | | | | | | | | | | | | | | | to <linux/sched/task.h> 'init_task' is really not part of core scheduler APIs but part of the fork() interface between the scheduler and process management. So move the declarations. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove the <linux/mm_types.h> dependency from <linux/sched.h>Ingo Molnar2017-03-031-1/+1
| | | | | | | | | | | Use the freshly introduced, reduced size <linux/mm_types_task.h> header instead. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the 'root_task_group' declaration to ↵Ingo Molnar2017-03-031-4/+0
| | | | | | | | | | | | | | | | | <linux/sched/autogroup.h> Also remove the duplicate declaration from <linux/init_task.h>. ( That declaration was originally duplicated for dependency hell reasons, but there's no problem including the much smaller <linux/sched/autogroup.h> header now, to pick up the right prototype. ) Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move task-stack related APIs from <linux/sched.h> to ↵Ingo Molnar2017-03-031-106/+9
| | | | | | | | | | | | | | | | | | <linux/sched/task_stack.h> Split out the task->stack related functionality, which is not really part of the core scheduler APIs. Only keep task_thread_info() because it's used by sched.h. Update the code that uses those facilities. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the PREEMPT_COUNT defines from <linux/sched.h> to ↵Ingo Molnar2017-03-031-21/+0
| | | | | | | | | | | | | | <linux/preempt.h> These defines are not really part of the scheduler's driver API, but are related to the preempt count - so move them to <linux/preempt.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/core: Move, sort and clean up <linux/sched.h> structure predeclarationsIngo Molnar2017-03-031-33/+23
| | | | | | | | | | | | | | | | | Most of the structure predeclarations were at the head of sched.h, but not all of them - there were a number of lines spread around sched.h, in random places. Move them to the head, and also sort them alphabetically. Remove unused entries. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move task lifetime APIs from <linux/sched.h> to ↵Ingo Molnar2017-03-031-91/+0
| | | | | | | | | | | | | | | | | <linux/sched/task.h> There's a fair amount of task lifetime management (a.k.a fork()/exit()) related APIs in <linux/sched.h>, but only a small fraction of the users of the generic sched.h header make use of them. Move these functions to the <linux/sched/task.h> header. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Split hotplug CPU interfaces out of <linux/sched.h> into ↵Ingo Molnar2017-03-031-15/+0
| | | | | | | | | | | | | <linux/sched/hotplug.h> Split the CPU hotplug scheduler APIs out of the common header. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move <asm/current.h> include from the middle of ↵Ingo Molnar2017-03-031-2/+2
| | | | | | | | | | | | | | | | | | | | | | <linux/sched.h> to the header portion Linux-0.01 already defined 'current' in the middle of sched.h, so this is an ancient historical precedent - but still in a modern kernel it looks a bit weird that we have: #include <asm/current.h> in the middle of the header. Move it further up. If this was done for some obscure dependency reasons then we'll trigger and document it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers, time/timekeeping: Move the xtime_update() prototype from ↵Ingo Molnar2017-03-031-2/+0
| | | | | | | | | | | | | <linux/sched.h> to <linux/time.h> This was in <linux/sched.h> only for hysterical raisins. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move debugging functions from <linux/sched.h> to ↵Ingo Molnar2017-03-031-36/+0
| | | | | | | | | | | | | | | | | <linux/sched/debug.h> Collect the various scheduler and task state debugging APIs scattered around <linux/sched.h> into the new <linux/sched/debug.h> header. In particular the show_regs() and show_stack() prototype affects many files, update them. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the NOHZ APIs from <linux/sched.h> to <linux/sched/nohz.h>Ingo Molnar2017-03-031-35/+0
| | | | | | | | | | | | | | | There's a number of NOHZ/dyntics related functionality in <linux/sched.h>, but only a handful of timer files are making use of them. Move them into their own header. This better documents these APIs and unclutters <linux/sched.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move task statistics APIs from <linux/sched.h> to ↵Ingo Molnar2017-03-031-10/+0
| | | | | | | | | | | | | | | <linux/sched/stat.h> There are a number of task statistics related variables and methods exported via sched.h - collect them into <linux/sched/stat.h> and include it from their usage sites. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the memalloc_noio_*() APIs to <linux/sched/mm.h>Ingo Molnar2017-03-031-22/+0
| | | | | | | | | | | In preparation to remove the <linux/gfp.h> include from <linux/sched.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move signal wakeup & sigpending methods from <linux/sched.h> ↵Ingo Molnar2017-03-031-51/+0
| | | | | | | | | | | | | into <linux/sched/signal.h> This reduces the size of <linux/sched.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move CONFIG_TASK_XACCT bits from <linux/sched.h> to ↵Ingo Molnar2017-03-031-38/+0
| | | | | | | | | | | | | | <linux/sched/xacct.h> The CONFIG_TASK_XACCT=y accounting inline functions are only used by fs/read_write.c, so move them into their separate header. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Remove various unrelated headers from <linux/sched.h>Ingo Molnar2017-03-031-28/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remove the following header inclusions from <linux/sched.h>: #include <asm/param.h> #include <linux/threads.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/timex.h> #include <linux/jiffies.h> #include <linux/rbtree.h> #include <linux/thread_info.h> #include <linux/cpumask.h> #include <linux/errno.h> #include <linux/nodemask.h> #include <linux/preempt.h> #include <asm/page.h> #include <linux/smp.h> #include <linux/compiler.h> #include <linux/completion.h> #include <linux/percpu.h> #include <linux/topology.h> #include <linux/rcupdate.h> #include <linux/time.h> #include <linux/timer.h> #include <linux/llist.h> #include <linux/uidgid.h> #include <asm/processor.h> because they are either not required, or are already included naturally as part of the remaining headers. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the JOBCTL_ defines and methods from <linux/sched.h> to ↵Ingo Molnar2017-03-031-30/+0
| | | | | | | | | | | | | | | | | <linux/sched/jobctl.h> Only a small fraction of sched.h users actually utilizes these defines, and they are not scheduler functionality in any case, so move them into their separate header. (Also make <linux/sched/jobctl.h> a self-contained header.) Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the NUMA balancing interfaces from <linux/sched.h> to ↵Ingo Molnar2017-03-031-35/+0
| | | | | | | | | | | | | | | <linux/sched/numa_balancing.h> Split out the interface between the scheduler and the MM which deals with page fault driven NUMA balancing, into the new <linux/sched/numa_balancing.h> header. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move in_vfork() from <linux/sched.h> to <linux/sched/mm.h>Ingo Molnar2017-03-031-26/+0
| | | | | | | | | | | | The in_vfork() function deals with task->mm, so it better belongs into <linux/sched/mm.h>. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sched/headers: Move the 'init_mm' declaration from <linux/sched.h> to ↵Ingo Molnar2017-03-031-2/+0
| | | | | | | | | | | <linux/mm_types.h> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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