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mm: use passed vm_fault structure in __do_fault() 

Instead of creating another vm_fault structure, use the one passed to
__do_fault() for passing arguments into fault handler.

Link: http://lkml.kernel.org/r/1479460644-25076-5-git-send-email-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2016-12-14 15:07:07 -08:00 committed by Linus Torvalds
parent 0721ec8bc1
commit 667240e0f2
1 changed files with 10 additions and 15 deletions
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25
mm/memory.c
View File

@ -2848,37 +2848,31 @@ static int __do_fault(struct vm_fault *vmf, struct page *cow_page,
struct page **page, void **entry)
{
struct vm_area_struct *vma = vmf->vma;
struct vm_fault vmf2;
int ret;
vmf2.address = vmf->address;
vmf2.pgoff = vmf->pgoff;
vmf2.flags = vmf->flags;
vmf2.page = NULL;
vmf2.gfp_mask = __get_fault_gfp_mask(vma);
vmf2.cow_page = cow_page;
vmf->cow_page = cow_page;
ret = vma->vm_ops->fault(vma, &vmf2);
ret = vma->vm_ops->fault(vma, vmf);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
return ret;
if (ret & VM_FAULT_DAX_LOCKED) {
*entry = vmf2.entry;
*entry = vmf->entry;
return ret;
}
if (unlikely(PageHWPoison(vmf2.page))) {
if (unlikely(PageHWPoison(vmf->page))) {
if (ret & VM_FAULT_LOCKED)
unlock_page(vmf2.page);
put_page(vmf2.page);
unlock_page(vmf->page);
put_page(vmf->page);
return VM_FAULT_HWPOISON;
}
if (unlikely(!(ret & VM_FAULT_LOCKED)))
lock_page(vmf2.page);
lock_page(vmf->page);
else
VM_BUG_ON_PAGE(!PageLocked(vmf2.page), vmf2.page);
VM_BUG_ON_PAGE(!PageLocked(vmf->page), vmf->page);
*page = vmf2.page;
*page = vmf->page;
return ret;
}
@ -3614,6 +3608,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
.address = address & PAGE_MASK,
.flags = flags,
.pgoff = linear_page_index(vma, address),
.gfp_mask = __get_fault_gfp_mask(vma),
};
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;