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mm/memory: convert do_read_fault() to use folios 

Saves one implicit call to compound_head().

Link: https://lkml.kernel.org/r/20230706163847.403202-4-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 09:38:47 -07:00 committed by Andrew Morton
parent 6f609b7e37
commit 22d1e68f5a
1 changed files with 4 additions and 2 deletions
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6
mm/memory.c
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@ -4536,6 +4536,7 @@ static inline bool should_fault_around(struct vm_fault *vmf)
static vm_fault_t do_read_fault(struct vm_fault *vmf)
{
vm_fault_t ret = 0;
struct folio *folio;
/*
* Let's call ->map_pages() first and use ->fault() as fallback
@ -4553,9 +4554,10 @@ static vm_fault_t do_read_fault(struct vm_fault *vmf)
return ret;
ret |= finish_fault(vmf);
unlock_page(vmf->page);
folio = page_folio(vmf->page);
folio_unlock(folio);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
put_page(vmf->page);
folio_put(folio);
return ret;
}