The patch titled
Subject: mm: introduce vmf_insert_pfn_prot()
has been added to the -mm tree. Its filename is
mm-introduce-vmf_insert_pfn_prot.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-introduce-vmf_insert_pfn_prot.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-introduce-vmf_insert_pfn_prot.patch
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The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: mm: introduce vmf_insert_pfn_prot()
Like vm_insert_pfn_prot(), but returns a vm_fault_t instead of an errno.
Also unexport vm_insert_pfn_prot as it has no modular users.
Link: http://lkml.kernel.org/r/20180828145728.11873-4-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>
Cc: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 2 +
mm/memory.c | 47 ++++++++++++++++++++++++++++---------------
2 files changed, 33 insertions(+), 16 deletions(-)
--- a/include/linux/mm.h~mm-introduce-vmf_insert_pfn_prot
+++ a/include/linux/mm.h
@@ -2482,6 +2482,8 @@ int vm_insert_pfn(struct vm_area_struct
unsigned long pfn);
int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn, pgprot_t pgprot);
+vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
+ unsigned long pfn, pgprot_t pgprot);
vm_fault_t vmf_insert_mixed(struct vm_area_struct *vma, unsigned long addr,
pfn_t pfn);
vm_fault_t vmf_insert_mixed_mkwrite(struct vm_area_struct *vma,
--- a/mm/memory.c~mm-introduce-vmf_insert_pfn_prot
+++ a/mm/memory.c
@@ -1843,21 +1843,6 @@ int vm_insert_pfn(struct vm_area_struct
}
EXPORT_SYMBOL(vm_insert_pfn);
-/**
- * vm_insert_pfn_prot - insert single pfn into user vma with specified pgprot
- * @vma: user vma to map to
- * @addr: target user address of this page
- * @pfn: source kernel pfn
- * @pgprot: pgprot flags for the inserted page
- *
- * This is exactly like vm_insert_pfn, except that it allows drivers to
- * to override pgprot on a per-page basis.
- *
- * This only makes sense for IO mappings, and it makes no sense for
- * cow mappings. In general, using multiple vmas is preferable;
- * vm_insert_pfn_prot should only be used if using multiple VMAs is
- * impractical.
- */
int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn, pgprot_t pgprot)
{
@@ -1887,7 +1872,37 @@ int vm_insert_pfn_prot(struct vm_area_st
return ret;
}
-EXPORT_SYMBOL(vm_insert_pfn_prot);
+
+/**
+ * vmf_insert_pfn_prot - insert single pfn into user vma with specified pgprot
+ * @vma: user vma to map to
+ * @addr: target user address of this page
+ * @pfn: source kernel pfn
+ * @pgprot: pgprot flags for the inserted page
+ *
+ * This is exactly like vmf_insert_pfn(), except that it allows drivers to
+ * to override pgprot on a per-page basis.
+ *
+ * This only makes sense for IO mappings, and it makes no sense for
+ * COW mappings. In general, using multiple vmas is preferable;
+ * vm_insert_pfn_prot should only be used if using multiple VMAs is
+ * impractical.
+ *
+ * Return: vm_fault_t value.
+ */
+vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
+ unsigned long pfn, pgprot_t pgprot)
+{
+ int err = vm_insert_pfn_prot(vma, addr, pfn, pgprot);
+
+ if (err == -ENOMEM)
+ return VM_FAULT_OOM;
+ if (err < 0 && err != -EBUSY)
+ return VM_FAULT_SIGBUS;
+
+ return VM_FAULT_NOPAGE;
+}
+EXPORT_SYMBOL(vmf_insert_pfn_prot);
static bool vm_mixed_ok(struct vm_area_struct *vma, pfn_t pfn)
{
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
cramfs-convert-to-use-vmf_insert_mixed.patch
mm-remove-vm_insert_mixed.patch
mm-introduce-vmf_insert_pfn_prot.patch
x86-convert-vdso-to-use-vm_fault_t.patch
mm-make-vm_insert_pfn_prot-static.patch
mm-remove-references-to-vm_insert_pfn.patch
mm-remove-vm_insert_pfn.patch
mm-inline-vm_insert_pfn_prot-into-caller.patch
mm-convert-__vm_insert_mixed-to-vm_fault_t.patch
mm-convert-insert_pfn-to-vm_fault_t.patch
