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Subject[RFC PATCH 2/4] mm/mmu_notifier: use unsigned for event field in range struct
Date
From: Jérôme Glisse <jglisse@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 <jglisse@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: kvm@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
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