linux-kernel - [PATCH v6 3/8] mm/mmu_notifier: convert mmu_notifier

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Date:   Tue, 26 Mar 2019 12:47:42 -0400
From:   jglisse@...hat.com
To:     linux-kernel@...r.kernel.org
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Christian König <christian.koenig@....com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>, Jan Kara <jack@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ross Zwisler <zwisler@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>, kvm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v6 3/8] mm/mmu_notifier: convert mmu_notifier_range->blockable to a flags

From: Jérôme Glisse <jglisse@...hat.com>

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

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: Christian König <christian.koenig@....com>
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Peter Xu <peterx@...hat.com>
Cc: Felix Kuehling <Felix.Kuehling@....com>
Cc: Jason Gunthorpe <jgg@...lanox.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ross Zwisler <zwisler@...nel.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Christian Koenig <christian.koenig@....com>
Cc: Ralph Campbell <rcampbell@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: kvm@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-rdma@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
---
 include/linux/mmu_notifier.h | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index e630def131ce..c8672c366f67 100644
--- 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)		\
-- 
2.20.1