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[PATCH 11/53] sched/headers: Move task->mm handling methods to <linux/sched/mm.h>

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Move the following task->mm helper APIs into a new header file,
<linux/sched/mm.h>, to further reduce the size and complexity
of <linux/sched.h>.

Here are how the APIs are used in various kernel files:

  # mm_alloc():
  arch/arm/mach-rpc/ecard.c
  fs/exec.c
  include/linux/sched/mm.h
  kernel/fork.c

  # __mmdrop():
  arch/arc/include/asm/mmu_context.h
  include/linux/sched/mm.h
  kernel/fork.c

  # mmdrop():
  arch/arm/mach-rpc/ecard.c
  arch/m68k/sun3/mmu_emu.c
  arch/x86/mm/tlb.c
  drivers/gpu/drm/amd/amdkfd/kfd_process.c
  drivers/gpu/drm/i915/i915_gem_userptr.c
  drivers/infiniband/hw/hfi1/file_ops.c
  drivers/vfio/vfio_iommu_spapr_tce.c
  fs/exec.c
  fs/proc/base.c
  fs/proc/task_mmu.c
  fs/proc/task_nommu.c
  fs/userfaultfd.c
  include/linux/mmu_notifier.h
  include/linux/sched/mm.h
  kernel/fork.c
  kernel/futex.c
  kernel/sched/core.c
  mm/khugepaged.c
  mm/ksm.c
  mm/mmu_context.c
  mm/mmu_notifier.c
  mm/oom_kill.c
  virt/kvm/kvm_main.c

  # mmdrop_async_fn():
  include/linux/sched/mm.h

  # mmdrop_async():
  include/linux/sched/mm.h
  kernel/fork.c

  # mmget_not_zero():
  fs/userfaultfd.c
  include/linux/sched/mm.h
  mm/oom_kill.c

  # mmput():
  arch/arc/include/asm/mmu_context.h
  arch/arc/kernel/troubleshoot.c
  arch/frv/mm/mmu-context.c
  arch/powerpc/platforms/cell/spufs/context.c
  arch/sparc/include/asm/mmu_context_32.h
  drivers/android/binder.c
  drivers/gpu/drm/etnaviv/etnaviv_gem.c
  drivers/gpu/drm/i915/i915_gem_userptr.c
  drivers/infiniband/core/umem.c
  drivers/infiniband/core/umem_odp.c
  drivers/infiniband/core/uverbs_main.c
  drivers/infiniband/hw/mlx4/main.c
  drivers/infiniband/hw/mlx5/main.c
  drivers/infiniband/hw/usnic/usnic_uiom.c
  drivers/iommu/amd_iommu_v2.c
  drivers/iommu/intel-svm.c
  drivers/lguest/lguest_user.c
  drivers/misc/cxl/fault.c
  drivers/misc/mic/scif/scif_rma.c
  drivers/oprofile/buffer_sync.c
  drivers/vfio/vfio_iommu_type1.c
  drivers/vhost/vhost.c
  drivers/xen/gntdev.c
  fs/exec.c
  fs/proc/array.c
  fs/proc/base.c
  fs/proc/task_mmu.c
  fs/proc/task_nommu.c
  fs/userfaultfd.c
  include/linux/sched/mm.h
  kernel/cpuset.c
  kernel/events/core.c
  kernel/events/uprobes.c
  kernel/exit.c
  kernel/fork.c
  kernel/ptrace.c
  kernel/sys.c
  kernel/trace/trace_output.c
  kernel/tsacct.c
  mm/memcontrol.c
  mm/memory.c
  mm/mempolicy.c
  mm/migrate.c
  mm/mmu_notifier.c
  mm/nommu.c
  mm/oom_kill.c
  mm/process_vm_access.c
  mm/rmap.c
  mm/swapfile.c
  mm/util.c
  virt/kvm/async_pf.c

  # mmput_async():
  include/linux/sched/mm.h
  kernel/fork.c
  mm/oom_kill.c

  # get_task_mm():
  arch/arc/kernel/troubleshoot.c
  arch/powerpc/platforms/cell/spufs/context.c
  drivers/android/binder.c
  drivers/gpu/drm/etnaviv/etnaviv_gem.c
  drivers/infiniband/core/umem.c
  drivers/infiniband/core/umem_odp.c
  drivers/infiniband/hw/mlx4/main.c
  drivers/infiniband/hw/mlx5/main.c
  drivers/infiniband/hw/usnic/usnic_uiom.c
  drivers/iommu/amd_iommu_v2.c
  drivers/iommu/intel-svm.c
  drivers/lguest/lguest_user.c
  drivers/misc/cxl/fault.c
  drivers/misc/mic/scif/scif_rma.c
  drivers/oprofile/buffer_sync.c
  drivers/vfio/vfio_iommu_type1.c
  drivers/vhost/vhost.c
  drivers/xen/gntdev.c
  fs/proc/array.c
  fs/proc/base.c
  fs/proc/task_mmu.c
  include/linux/sched/mm.h
  kernel/cpuset.c
  kernel/events/core.c
  kernel/exit.c
  kernel/fork.c
  kernel/ptrace.c
  kernel/sys.c
  kernel/trace/trace_output.c
  kernel/tsacct.c
  mm/memcontrol.c
  mm/memory.c
  mm/mempolicy.c
  mm/migrate.c
  mm/mmu_notifier.c
  mm/nommu.c
  mm/util.c

  # mm_access():
  fs/proc/base.c
  include/linux/sched/mm.h
  kernel/fork.c
  mm/process_vm_access.c

  # mm_release():
  arch/arc/include/asm/mmu_context.h
  fs/exec.c
  include/linux/sched/mm.h
  include/uapi/linux/sched.h
  kernel/exit.c
  kernel/fork.c

Cc: 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>
---
 include/linux/sched.h    | 52 ----------------------------------------------------
 include/linux/sched/mm.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 52 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f53b11a88ee0..a3232d4c97da 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2379,58 +2379,6 @@ static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
 	return sp;
 }
 
-/*
- * Routines for handling mm_structs
- */
-extern struct mm_struct * mm_alloc(void);
-
-/* mmdrop drops the mm and the page tables */
-extern void __mmdrop(struct mm_struct *);
-static inline void mmdrop(struct mm_struct *mm)
-{
-	if (unlikely(atomic_dec_and_test(&mm->mm_count)))
-		__mmdrop(mm);
-}
-
-static inline void mmdrop_async_fn(struct work_struct *work)
-{
-	struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work);
-	__mmdrop(mm);
-}
-
-static inline void mmdrop_async(struct mm_struct *mm)
-{
-	if (unlikely(atomic_dec_and_test(&mm->mm_count))) {
-		INIT_WORK(&mm->async_put_work, mmdrop_async_fn);
-		schedule_work(&mm->async_put_work);
-	}
-}
-
-static inline bool mmget_not_zero(struct mm_struct *mm)
-{
-	return atomic_inc_not_zero(&mm->mm_users);
-}
-
-/* mmput gets rid of the mappings and all user-space */
-extern void mmput(struct mm_struct *);
-#ifdef CONFIG_MMU
-/* same as above but performs the slow path from the async context. Can
- * be called from the atomic context as well
- */
-extern void mmput_async(struct mm_struct *);
-#endif
-
-/* Grab a reference to a task's mm, if it is not already going away */
-extern struct mm_struct *get_task_mm(struct task_struct *task);
-/*
- * Grab a reference to a task's mm, if it is not already going away
- * and ptrace_may_access with the mode parameter passed to it
- * succeeds.
- */
-extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
-/* Remove the current tasks stale references to the old mm_struct */
-extern void mm_release(struct task_struct *, struct mm_struct *);
-
 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
 			struct task_struct *, unsigned long);
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index d32e3932b2e3..175b61f2672a 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -5,4 +5,56 @@
 #include <linux/mm_types.h>
 #include <linux/gfp.h>
 
+/*
+ * Routines for handling mm_structs
+ */
+extern struct mm_struct * mm_alloc(void);
+
+/* mmdrop drops the mm and the page tables */
+extern void __mmdrop(struct mm_struct *);
+static inline void mmdrop(struct mm_struct *mm)
+{
+	if (unlikely(atomic_dec_and_test(&mm->mm_count)))
+		__mmdrop(mm);
+}
+
+static inline void mmdrop_async_fn(struct work_struct *work)
+{
+	struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work);
+	__mmdrop(mm);
+}
+
+static inline void mmdrop_async(struct mm_struct *mm)
+{
+	if (unlikely(atomic_dec_and_test(&mm->mm_count))) {
+		INIT_WORK(&mm->async_put_work, mmdrop_async_fn);
+		schedule_work(&mm->async_put_work);
+	}
+}
+
+static inline bool mmget_not_zero(struct mm_struct *mm)
+{
+	return atomic_inc_not_zero(&mm->mm_users);
+}
+
+/* mmput gets rid of the mappings and all user-space */
+extern void mmput(struct mm_struct *);
+#ifdef CONFIG_MMU
+/* same as above but performs the slow path from the async context. Can
+ * be called from the atomic context as well
+ */
+extern void mmput_async(struct mm_struct *);
+#endif
+
+/* Grab a reference to a task's mm, if it is not already going away */
+extern struct mm_struct *get_task_mm(struct task_struct *task);
+/*
+ * Grab a reference to a task's mm, if it is not already going away
+ * and ptrace_may_access with the mode parameter passed to it
+ * succeeds.
+ */
+extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
+/* Remove the current tasks stale references to the old mm_struct */
+extern void mm_release(struct task_struct *, struct mm_struct *);
+
 #endif /* _LINUX_SCHED_MM_H */
-- 
2.7.4

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[PATCH 00/53] sched.h modernization -v2, phase #3: "Move definitions between headers" Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 04/53] sched/headers: Move idle polling methods to <linux/sched/idle.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 16/53] sched/headers: Move 'struct pacct_struct' and 'struct cpu_itimer' form <linux/sched.h> to <linux/sched/signal.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 05/53] sched/headers: Move the wake-queue types and interfaces from sched.h into <linux/sched/wake_q.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 26/53] sched/headers: Move the memalloc_noio_*() APIs to <linux/sched/mm.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 28/53] sched/headers: Move the NOHZ APIs from <linux/sched.h> to <linux/sched/nohz.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 34/53] sched/headers, RCU: Move rcu_copy_process() from <linux/sched/task.h> to kernel/fork.c Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 30/53] sched/headers, time/timekeeping: Move the xtime_update() prototype from <linux/sched.h> to <linux/time.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 19:50 +0100
  [PATCH 17/53] sched/headers: Move the cpufreq interfaces to <linux/sched/cpufreq.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 11/53] sched/headers: Move task->mm handling methods to <linux/sched/mm.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 48/53] sched/headers: Move exit_files() and exit_itimers() from <linux/sched.h> to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 08/53] sched/headers: Move various ABI definitions to <uapi/linux/sched/types.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 19/53] sched/headers: Move the 'init_mm' declaration from <linux/sched.h> to <linux/mm_types.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 25/53] sched/headers: Move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 02/53] sched/headers: Move the 'cpu_idle_type' enum from <linux/sched.h> to <linux/sched/idle.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 50/53] sched/headers, timekeeping: Move the timer tick function prototypes to <linux/timekeeping.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 21/53] sched/headers: Move the NUMA balancing interfaces from <linux/sched.h> to <linux/sched/numa_balancing.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 31/53] sched/headers: Move <asm/current.h> include from the middle of <linux/sched.h> to the header portion Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 15/53] sched/headers: Move softlockup detector watchdog methods to <linux/nmi.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 29/53] sched/headers: Move debugging functions from <linux/sched.h> to <linux/sched/debug.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 27/53] sched/headers: Move task statistics APIs from <linux/sched.h> to <linux/sched/stat.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 23/53] sched/headers: Remove various unrelated headers from <linux/sched.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 13/53] sched/headers: Move task_struct::signal and task_struct::sighand types and accessors into <linux/sched/signal.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 18/53] sched/headers: Move more mm_struct related functionality from <linux/sched.h> to <linux/sched/mm.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 01/53] sched/headers: Move scheduler topology interfaces to <linux/sched/topology.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:00 +0100
  [PATCH 42/53] sched/headers: Move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 49/53] sched/headers: Move _init() prototypes from <linux/sched.h> to <linux/sched/init.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 41/53] sched/headers: Remove the <linux/mm_types.h> dependency from <linux/sched.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 44/53] sched/headers: Move cputime functionality from <linux/sched.h> and <linux/cputime.h> into <linux/sched/cputime.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 40/53] mm/headers, sched/headers: Move task related MM types from <linux/mm_types.> to <linux/mm_types_task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 43/53] sched/headers: Move the task_lock()/unlock() APIs to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:20 +0100
  [PATCH 46/53] sched/headers, vfs/execve: Move the do_execve*() prototypes from <linux/sched.h> to <linux/binfmts.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:50 +0100
  [PATCH 53/53] sched/headers: Move the sched_exec() prototype to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 20:50 +0100
  [PATCH 45/53] sched/headers: Move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 21:40 +0100
  [PATCH 51/53] sched/headers, mm: Move 'struct tlbflush_unmap_batch' from <linux/sched.h> to <linux/mm_types_task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 21:40 +0100
  [PATCH 37/53] sched/headers: Move task-stack related APIs from <linux/sched.h> to <linux/sched/task_stack.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 21:50 +0100
  [PATCH 47/53] sched/headers: Move kstack_end() from <linux/sched.h> to <linux/sched/task_stack.h> Ingo Molnar <mingo@kernel.org> - 2017-02-08 22:40 +0100
  [PATCH 52/53] sched/headers: Move the get_task_struct()/put_task_struct() and related APIs from <linux/sched.h> to <linux/sched/task.h> Ingo Molnar <mingo@kernel.org> - 2017-02-09 00:10 +0100

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