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mm: use new return type 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.

Link: http://lkml.kernel.org/r/20180511190542.GA2412@jordon-HP-15-Notebook-PC
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Souptick Joarder 2018-06-07 17:08:00 -07:00 committed by Linus Torvalds
parent a380b40abb
commit 2bcd6454ba
3 changed files with 7 additions and 7 deletions
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4
include/linux/mm.h
View File

@ -2303,10 +2303,10 @@ extern void truncate_inode_pages_range(struct address_space *,
extern void truncate_inode_pages_final(struct address_space *);
/* generic vm_area_ops exported for stackable file systems */
extern int filemap_fault(struct vm_fault *vmf);
extern vm_fault_t filemap_fault(struct vm_fault *vmf);
extern void filemap_map_pages(struct vm_fault *vmf,
pgoff_t start_pgoff, pgoff_t end_pgoff);
extern int filemap_page_mkwrite(struct vm_fault *vmf);
extern vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf);
/* mm/page-writeback.c */
int __must_check write_one_page(struct page *page);

8
mm/filemap.c
View File

@ -2489,7 +2489,7 @@ static void do_async_mmap_readahead(struct vm_area_struct *vma,
*
* We never return with VM_FAULT_RETRY and a bit from VM_FAULT_ERROR set.
*/
int filemap_fault(struct vm_fault *vmf)
vm_fault_t filemap_fault(struct vm_fault *vmf)
{
int error;
struct file *file = vmf->vma->vm_file;
@ -2499,7 +2499,7 @@ int filemap_fault(struct vm_fault *vmf)
pgoff_t offset = vmf->pgoff;
pgoff_t max_off;
struct page *page;
int ret = 0;
vm_fault_t ret = 0;
max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
if (unlikely(offset >= max_off))
@ -2693,11 +2693,11 @@ next:
}
EXPORT_SYMBOL(filemap_map_pages);
int filemap_page_mkwrite(struct vm_fault *vmf)
vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct inode *inode = file_inode(vmf->vma->vm_file);
int ret = VM_FAULT_LOCKED;
vm_fault_t ret = VM_FAULT_LOCKED;
sb_start_pagefault(inode->i_sb);
file_update_time(vmf->vma->vm_file);

2
mm/nommu.c
View File

@ -1763,7 +1763,7 @@ unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr,
return -ENOMEM;
}
int filemap_fault(struct vm_fault *vmf)
vm_fault_t filemap_fault(struct vm_fault *vmf)
{
BUG();
return 0;