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Commit f1f10076 authored by Vegard Nossum's avatar Vegard Nossum Committed by Linus Torvalds
Browse files

mm: add new mmgrab() helper 

Apart from adding the helper function itself, the rest of the kernel is
converted mechanically using:

  git grep -l 'atomic_inc.*mm_count' | xargs sed -i 's/atomic_inc(&\(.*\)->mm_count);/mmgrab\(\1\);/'
  git grep -l 'atomic_inc.*mm_count' | xargs sed -i 's/atomic_inc(&\(.*\)\.mm_count);/mmgrab\(\&\1\);/'

This is needed for a later patch that hooks into the helper, but might
be a worthwhile cleanup on its own.

(Michal Hocko provided most of the kerneldoc comment.)

Link: http://lkml.kernel.org/r/20161218123229.22952-1-vegard.nossum@oracle.com


Signed-off-by: default avatarVegard Nossum <vegard.nossum@oracle.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 522b837c

arch/alpha/kernel/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -144,7 +144,7 @@ smp_callin(void) 
		alpha_mv.smp_callin();



	/* All kernel threads share the same mm context.  */

	atomic_inc(&init_mm.mm_count);

	mmgrab(&init_mm);

	current->active_mm = &init_mm;



	/* inform the notifiers about the new cpu */

arch/arc/kernel/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -140,7 +140,7 @@ void start_kernel_secondary(void) 
	setup_processor();



	atomic_inc(&mm->mm_users);

	atomic_inc(&mm->mm_count);

	mmgrab(mm);

	current->active_mm = mm;

	cpumask_set_cpu(cpu, mm_cpumask(mm));

arch/arm/kernel/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -371,7 +371,7 @@ asmlinkage void secondary_start_kernel(void) 
	 * reference and switch to it.

	 */

	cpu = smp_processor_id();

	atomic_inc(&mm->mm_count);

	mmgrab(mm);

	current->active_mm = mm;

	cpumask_set_cpu(cpu, mm_cpumask(mm));

arch/arm64/kernel/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -222,7 +222,7 @@ asmlinkage void secondary_start_kernel(void) 
	 * All kernel threads share the same mm context; grab a

	 * reference and switch to it.

	 */

	atomic_inc(&mm->mm_count);

	mmgrab(mm);

	current->active_mm = mm;



	/*

arch/blackfin/mach-common/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -308,7 +308,7 @@ void secondary_start_kernel(void) 


	/* Attach the new idle task to the global mm. */

	atomic_inc(&mm->mm_users);

	atomic_inc(&mm->mm_count);

	mmgrab(mm);

	current->active_mm = mm;



	preempt_disable();