linux-kernel - [RFC v2 03/10] mm: Add a range parameter to the vm

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Message-Id: <1495624801-8063-4-git-send-email-ldufour@linux.vnet.ibm.com>
Date:   Wed, 24 May 2017 13:19:54 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     linux-mm@...ck.org
Cc:     Davidlohr Bueso <dave@...olabs.net>, akpm@...ux-foundation.org,
        Jan Kara <jack@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Michal Hocko <mhocko@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andi Kleen <andi@...stfloor.org>, haren@...ux.vnet.ibm.com,
        aneesh.kumar@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: [RFC v2 03/10] mm: Add a range parameter to the vm_fault structure

When handling a page fault, it happens that the mmap_sem is released
during the processing. As moving to range lock requires to pass the
range parameter to the lock/unlock operation, this patch add a pointer
to the range structure used when locking the mmap_sem to vm_fault
structure.

Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
---
 include/linux/mm.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7cb17c6b97de..4ad96294c180 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -344,6 +344,9 @@ struct vm_fault {
 					 * page table to avoid allocation from
 					 * atomic context.
 					 */
+#ifdef CONFIG_MEM_RANGE_LOCK
+	struct range_lock *lockrange;	/* Range lock interval */
+#endif
 };
 
 /* page entry size for vm->huge_fault() */
-- 
2.7.4