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s390/mm: use RCU for gmap notifier list and the per-mm gmap list

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The gmap notifier list and the gmap list in the mm_struct change rarely.
Use RCU to optimize the reader of these lists.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2016-03-08 11:54:14 +01:00
committed by Christian Borntraeger
parent 414d3b0749
commit 8ecb1a59d6
5 changed files with 41 additions and 29 deletions
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11
arch/s390/include/asm/mmu.h
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@@ -8,8 +8,9 @@ typedef struct {
cpumask_t cpu_attach_mask;
atomic_t attach_count;
unsigned int flush_mm;
spinlock_t list_lock;
spinlock_t pgtable_lock;
struct list_head pgtable_list;
spinlock_t gmap_lock;
struct list_head gmap_list;
unsigned long asce;
unsigned long asce_limit;
@@ -22,9 +23,11 @@ typedef struct {
unsigned int use_skey:1;
} mm_context_t;
#define INIT_MM_CONTEXT(name) \
.context.list_lock = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
#define INIT_MM_CONTEXT(name) \
.context.pgtable_lock = \
__SPIN_LOCK_UNLOCKED(name.context.pgtable_lock), \
.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
.context.gmap_lock = __SPIN_LOCK_UNLOCKED(name.context.gmap_lock), \
.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
static inline int tprot(unsigned long addr)