[RFC PATCH 2/4] mm/mmu_notifier: use unsigned for event field in range struct

[jglisse]

From: Jérôme Glisse <jgli...@redhat.com>

Use unsigned for event field in range struct so that we can also set
flags with the event. This patch change the field and introduce the
helper.

Signed-off-by: Jérôme Glisse <jgli...@redhat.com>
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Peter Xu <pet...@redhat.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Radim Krčmář <rkrc...@redhat.com>
Cc: k...@vger.kernel.org
---
 include/linux/mmu_notifier.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index be873c431886..d7a35975c2bd 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -6,6 +6,7 @@
 #include <linux/spinlock.h>
 #include <linux/mm_types.h>
 #include <linux/srcu.h>
+#include <linux/log2.h>
 
 struct mmu_notifier;
 struct mmu_notifier_ops;
@@ -38,8 +39,11 @@ enum mmu_notifier_event {
        MMU_NOTIFY_PROTECTION_VMA,
        MMU_NOTIFY_PROTECTION_PAGE,
        MMU_NOTIFY_SOFT_DIRTY,
+       MMU_NOTIFY_EVENT_MAX
 };
 
+#define MMU_NOTIFIER_EVENT_BITS order_base_2(MMU_NOTIFY_EVENT_MAX)
+
 #ifdef CONFIG_MMU_NOTIFIER
 
 /*
@@ -60,7 +64,7 @@ struct mmu_notifier_range {
        struct mm_struct *mm;
        unsigned long start;
        unsigned long end;
-       enum mmu_notifier_event event;
+       unsigned event;
        bool blockable;
 };
 
@@ -352,7 +356,7 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct 
*mm)
 
 
 static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
-                                          enum mmu_notifier_event event,
+                                          unsigned event,
                                           struct vm_area_struct *vma,
                                           struct mm_struct *mm,
                                           unsigned long start,
-- 
2.17.1