linux-kernel - [PATCH v2] mm: Change return type to vm_fault

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Date:   Fri, 11 May 2018 23:36:39 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     akpm@...ux-foundation.org, mhocko@...e.com, hughd@...gle.com,
        dan.j.williams@...el.com, rientjes@...gle.com,
        mike.kravetz@...cle.com, n-horiguchi@...jp.nec.com,
        aneesh.kumar@...ux.vnet.ibm.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        willy@...radead.org
Subject: [PATCH v2] mm: Change return type to vm_fault_t

Use new return type vm_fault_t for fault handler
in struct vm_operations_struct. For now, this is
just documenting that the function returns a 
VM_FAULT value rather than an errno.  Once all
instances are converted, vm_fault_t will become
a distinct type.

commit 1c8f422059ae ("mm: change return type to
vm_fault_t")

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
v2: Updated the change log

 mm/hugetlb.c | 2 +-
 mm/mmap.c    | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7c204e3..acb432a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3158,7 +3158,7 @@ static int hugetlb_vm_op_split(struct vm_area_struct *vma, unsigned long addr)
  * hugegpage VMA.  do_page_fault() is supposed to trap this, so BUG is we get
  * this far.
  */
-static int hugetlb_vm_op_fault(struct vm_fault *vmf)
+static vm_fault_t hugetlb_vm_op_fault(struct vm_fault *vmf)
 {
 	BUG();
 	return 0;
diff --git a/mm/mmap.c b/mm/mmap.c
index 9efdc021..ac41b34 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3208,7 +3208,7 @@ void vm_stat_account(struct mm_struct *mm, vm_flags_t flags, long npages)
 		mm->data_vm += npages;
 }
 
-static int special_mapping_fault(struct vm_fault *vmf);
+static vm_fault_t special_mapping_fault(struct vm_fault *vmf);
 
 /*
  * Having a close hook prevents vma merging regardless of flags.
@@ -3247,7 +3247,7 @@ static int special_mapping_mremap(struct vm_area_struct *new_vma)
 	.fault = special_mapping_fault,
 };
 
-static int special_mapping_fault(struct vm_fault *vmf)
+static vm_fault_t special_mapping_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	pgoff_t pgoff;
-- 
1.9.1