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s390/mm: use a single lock for the fields in mm_context_t

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The three locks 'lock', 'pgtable_lock' and 'gmap_lock' in the
mm_context_t can be reduced to a single lock.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2017-08-17 18:17:49 +02:00
parent 60f07c8ec5
commit f28a4b4ddf
4 changed files with 12 additions and 19 deletions
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8
arch/s390/mm/gmap.c
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@@ -100,14 +100,14 @@ struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit)
if (!gmap)
return NULL;
gmap->mm = mm;
spin_lock(&mm->context.gmap_lock);
spin_lock(&mm->context.lock);
list_add_rcu(&gmap->list, &mm->context.gmap_list);
if (list_is_singular(&mm->context.gmap_list))
gmap_asce = gmap->asce;
else
gmap_asce = -1UL;
WRITE_ONCE(mm->context.gmap_asce, gmap_asce);
spin_unlock(&mm->context.gmap_lock);
spin_unlock(&mm->context.lock);
return gmap;
}
EXPORT_SYMBOL_GPL(gmap_create);
@@ -248,7 +248,7 @@ void gmap_remove(struct gmap *gmap)
spin_unlock(&gmap->shadow_lock);
}
/* Remove gmap from the pre-mm list */
spin_lock(&gmap->mm->context.gmap_lock);
spin_lock(&gmap->mm->context.lock);
list_del_rcu(&gmap->list);
if (list_empty(&gmap->mm->context.gmap_list))
gmap_asce = 0;
@@ -258,7 +258,7 @@ void gmap_remove(struct gmap *gmap)
else
gmap_asce = -1UL;
WRITE_ONCE(gmap->mm->context.gmap_asce, gmap_asce);
spin_unlock(&gmap->mm->context.gmap_lock);
spin_unlock(&gmap->mm->context.lock);
synchronize_rcu();
/* Put reference */
gmap_put(gmap);