mm/mmu_notifier: convert mmu_notifier_range->blockable to a flags

Use an unsigned field for flags other than blockable and convert the
blockable field to be one of those flags.

Link: http://lkml.kernel.org/r/20190326164747.24405-4-jglisse@redhat.com
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krcmar <rkrcmar@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Christian Koenig <christian.koenig@amd.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index e630def..c8672c3 100644 (file)
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -25,11 +25,13 @@ struct mmu_notifier_mm {
        spinlock_t lock;
 };
 
+#define MMU_NOTIFIER_RANGE_BLOCKABLE (1 << 0)
+
 struct mmu_notifier_range {
        struct mm_struct *mm;
        unsigned long start;
        unsigned long end;
-       bool blockable;
+       unsigned flags;
 };
 
 struct mmu_notifier_ops {
@@ -229,7 +231,7 @@ extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
 static inline bool
 mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
 {
-       return range->blockable;
+       return (range->flags & MMU_NOTIFIER_RANGE_BLOCKABLE);
 }
 
 static inline void mmu_notifier_release(struct mm_struct *mm)
@@ -275,7 +277,7 @@ static inline void
 mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
 {
        if (mm_has_notifiers(range->mm)) {
-               range->blockable = true;
+               range->flags |= MMU_NOTIFIER_RANGE_BLOCKABLE;
                __mmu_notifier_invalidate_range_start(range);
        }
 }
@@ -284,7 +286,7 @@ static inline int
 mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
 {
        if (mm_has_notifiers(range->mm)) {
-               range->blockable = false;
+               range->flags &= ~MMU_NOTIFIER_RANGE_BLOCKABLE;
                return __mmu_notifier_invalidate_range_start(range);
        }
        return 0;
@@ -331,6 +333,7 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
        range->mm = mm;
        range->start = start;
        range->end = end;
+       range->flags = 0;
 }
 
 #define ptep_clear_flush_young_notify(__vma, __address, __ptep)                \