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

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Date:   Thu, 31 Jan 2019 13:37:04 -0500
From:   jglisse@...hat.com
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org,
        Jérôme Glisse <jglisse@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm@...r.kernel.org
Subject: [RFC PATCH 2/4] mm/mmu_notifier: use unsigned for event field in range struct

From: Jérôme Glisse <jglisse@...hat.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@...hat.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Peter Xu <peterx@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: kvm@...r.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