The patch titled
Subject: mm/memory: convert wp_page_shared() to use folios
has been added to the -mm mm-unstable branch. Its filename is
mm-memory-convert-wp_page_shared-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-wp_page_shared-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 wp_page_shared() to use folios
Date: Thu, 6 Jul 2023 09:38:45 -0700
Saves six implicit calls to compound_head().
Link: https://lkml.kernel.org/r/20230706163847.403202-2-sidhartha.kumar@xxxxxxxxxx
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: ZhangPeng <zhangpeng362@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
--- a/mm/memory.c~mm-memory-convert-wp_page_shared-to-use-folios
+++ a/mm/memory.c
@@ -3286,13 +3286,13 @@ static vm_fault_t wp_pfn_shared(struct v
return 0;
}
-static vm_fault_t wp_page_shared(struct vm_fault *vmf)
+static vm_fault_t wp_page_shared(struct vm_fault *vmf, struct folio *folio)
__releases(vmf->ptl)
{
struct vm_area_struct *vma = vmf->vma;
vm_fault_t ret = 0;
- get_page(vmf->page);
+ folio_get(folio);
if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
vm_fault_t tmp;
@@ -3301,21 +3301,21 @@ static vm_fault_t wp_page_shared(struct
tmp = do_page_mkwrite(vmf);
if (unlikely(!tmp || (tmp &
(VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
- put_page(vmf->page);
+ folio_put(folio);
return tmp;
}
tmp = finish_mkwrite_fault(vmf);
if (unlikely(tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) {
- unlock_page(vmf->page);
- put_page(vmf->page);
+ folio_unlock(folio);
+ folio_put(folio);
return tmp;
}
} else {
wp_page_reuse(vmf);
- lock_page(vmf->page);
+ folio_lock(folio);
}
ret |= fault_dirty_shared_page(vmf);
- put_page(vmf->page);
+ folio_put(folio);
return ret;
}
@@ -3366,6 +3366,9 @@ static vm_fault_t do_wp_page(struct vm_f
vmf->page = vm_normal_page(vma, vmf->address, vmf->orig_pte);
+ if (vmf->page)
+ folio = page_folio(vmf->page);
+
/*
* Shared mapping: we are guaranteed to have VM_WRITE and
* FAULT_FLAG_WRITE set at this point.
@@ -3380,12 +3383,9 @@ static vm_fault_t do_wp_page(struct vm_f
*/
if (!vmf->page)
return wp_pfn_shared(vmf);
- return wp_page_shared(vmf);
+ return wp_page_shared(vmf, folio);
}
- if (vmf->page)
- folio = page_folio(vmf->page);
-
/*
* Private mapping: create an exclusive anonymous page copy if reuse
* is impossible. We might miss VM_WRITE for FOLL_FORCE handling.
_
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
