linux-kernel - [PATCH v5 1/9] mm/mmu_notifier: helper to test if a range invalidation is blockable

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Date:   Tue, 19 Feb 2019 15:04:22 -0500
From:   jglisse@...hat.com
To:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Jérôme Glisse <jglisse@...hat.com>,
        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,
        linux-fsdevel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v5 1/9] mm/mmu_notifier: helper to test if a range invalidation is blockable

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

Simple helpers to test if range invalidation is blockable. Latter
patches use cocinnelle to convert all direct dereference of range->
blockable to use this function instead so that we can convert the
blockable field to an unsigned for more flags.

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
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: linux-fsdevel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
---
 include/linux/mmu_notifier.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 4050ec1c3b45..e630def131ce 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -226,6 +226,12 @@ extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r,
 extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
 				  unsigned long start, unsigned long end);
 
+static inline bool
+mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
+{
+	return range->blockable;
+}
+
 static inline void mmu_notifier_release(struct mm_struct *mm)
 {
 	if (mm_has_notifiers(mm))
@@ -455,6 +461,11 @@ static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range,
 #define mmu_notifier_range_init(range, mm, start, end) \
 	_mmu_notifier_range_init(range, start, end)
 
+static inline bool
+mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
+{
+	return true;
+}
 
 static inline int mm_has_notifiers(struct mm_struct *mm)
 {
-- 
2.17.2