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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@infradead.org
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2018-10-26 15:04:13 -07:00 committed by Linus Torvalds
parent 5d74763745
commit f5e6d1d5f8
2 changed files with 33 additions and 16 deletions
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2
include/linux/mm.h
View File

@ -2506,6 +2506,8 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
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,

47
mm/memory.c
View File

@ -1596,21 +1596,6 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
}
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)
{
@ -1640,7 +1625,37 @@ int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr,
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)
{