linux-kernel - [RFC v4 08/20] mm/spf: Fix fe.sequence init in __handle_mm

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Date:   Fri,  9 Jun 2017 16:20:57 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, kirill@...temov.name,
        ak@...ux.intel.com, mhocko@...nel.org, dave@...olabs.net,
        jack@...e.cz, Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com
Subject: [RFC v4 08/20] mm/spf: Fix fe.sequence init in __handle_mm_fault()

__handle_mm_fault() calls handle_pte_fault which requires the sequence
field of the fault_env to be initialized.

Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
---
 mm/memory.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/memory.c b/mm/memory.c
index 9de741554e15..f05288797c60 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3904,6 +3904,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
 	vmf.pmd = pmd_alloc(mm, vmf.pud, address);
 	if (!vmf.pmd)
 		return VM_FAULT_OOM;
+	vmf.sequence = raw_read_seqcount(&vma->vm_sequence);
 	if (pmd_none(*vmf.pmd) && transparent_hugepage_enabled(vma)) {
 		ret = create_huge_pmd(&vmf);
 		if (!(ret & VM_FAULT_FALLBACK))
-- 
2.7.4