The patch titled
Subject: mm/memory: convert do_page_mkwrite() to use folios
has been added to the -mm mm-unstable branch. Its filename is
mm-memory-convert-do_page_mkwrite-to-use-folios.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-convert-do_page_mkwrite-to-use-folios.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Subject: mm/memory: convert do_page_mkwrite() to use folios
Date: Sun, 2 Jul 2023 22:58:47 -0700
Saves one implicit call to compound_head();
Link: https://lkml.kernel.org/r/20230703055850.227169-1-sidhartha.kumar@xxxxxxxxxx
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: ZhangPeng <zhangpeng362@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/mm/memory.c~mm-memory-convert-do_page_mkwrite-to-use-folios
+++ a/mm/memory.c
@@ -2933,7 +2933,7 @@ static gfp_t __get_fault_gfp_mask(struct
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
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)) {
+ 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;
}
_
Patches currently in -mm which might be from sidhartha.kumar@xxxxxxxxxx are
mm-increase-usage-of-folio_next_index-helper.patch
mm-memory-convert-do_page_mkwrite-to-use-folios.patch
mm-memory-convert-wp_page_shared-to-use-folios.patch
mm-memory-convert-do_shared_fault-to-folios.patch
mm-memory-convert-do_read_fault-to-use-folios.patch
