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mm/memory: convert do_page_mkwrite() to use folios

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Saves one implicit call to compound_head().

Link: https://lkml.kernel.org/r/20230706163847.403202-1-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: ZhangPeng <zhangpeng362@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sidhartha Kumar 2023-07-06 09:38:44 -07:00 committed by Andrew Morton
parent 3ce2c24cb6
commit 3d243659d9
1 changed files with 5 additions and 5 deletions
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10
mm/memory.c
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@ -2933,7 +2933,7 @@ static gfp_t __get_fault_gfp_mask(struct vm_area_struct *vma)
static vm_fault_t do_page_mkwrite(struct vm_fault *vmf)
{
vm_fault_t ret;
struct page *page = vmf->page;
struct folio *folio = page_folio(vmf->page);
unsigned int old_flags = vmf->flags;
vmf->flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
@ -2948,14 +2948,14 @@ static vm_fault_t do_page_mkwrite(struct vm_fault *vmf)
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
return ret;
if (unlikely(!(ret & VM_FAULT_LOCKED))) {
lock_page(page);
if (!page->mapping) {
unlock_page(page);
folio_lock(folio);
if (!folio->mapping) {
folio_unlock(folio);
return 0; /* retry */
}
ret |= VM_FAULT_LOCKED;
} else
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
return ret;
}