OERV-BSP/kernel-spacemit-k1
4
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm: Convert page_vma_mapped_walk to work on PFNs

Browse Source 
page_mapped_in_vma() really just wants to walk one page, but as the
code stands, if passed the head page of a compound page, it will
walk every page in the compound page.  Extract pfn/nr_pages/pgoff
from the struct page early, so they can be overridden by
page_mapped_in_vma().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2022-02-03 11:40:17 -05:00
parent aef13dec0a
commit 2aff7a4755
6 changed files with 58 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
include/linux/rmap.h
View File

@@ -11,6 +11,7 @@
#include <linux/rwsem.h>
#include <linux/memcontrol.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
/*
* The anon_vma heads a list of private "related" vmas, to scan if
@@ -201,11 +202,13 @@ int make_device_exclusive_range(struct mm_struct *mm, unsigned long start,
/* Avoid racy checks */
#define PVMW_SYNC (1 << 0)
/* Look for migarion entries rather than present PTEs */
/* Look for migration entries rather than present PTEs */
#define PVMW_MIGRATION (1 << 1)
struct page_vma_mapped_walk {
struct page *page;
unsigned long pfn;
unsigned long nr_pages;
pgoff_t pgoff;
struct vm_area_struct *vma;
unsigned long address;
pmd_t *pmd;
@@ -216,7 +219,9 @@ struct page_vma_mapped_walk {
#define DEFINE_PAGE_VMA_WALK(name, _page, _vma, _address, _flags) \
struct page_vma_mapped_walk name = { \
.page = _page, \
.pfn = page_to_pfn(_page), \
.nr_pages = compound_nr(page), \
.pgoff = page_to_pgoff(page), \
.vma = _vma, \
.address = _address, \
.flags = _flags, \
@@ -224,7 +229,9 @@ struct page_vma_mapped_walk {
#define DEFINE_FOLIO_VMA_WALK(name, _folio, _vma, _address, _flags) \
struct page_vma_mapped_walk name = { \
.page = &_folio->page, \
.pfn = folio_pfn(_folio), \
.nr_pages = folio_nr_pages(_folio), \
.pgoff = folio_pgoff(_folio), \
.vma = _vma, \
.address = _address, \
.flags = _flags, \
@@ -233,7 +240,7 @@ struct page_vma_mapped_walk {
static inline void page_vma_mapped_walk_done(struct page_vma_mapped_walk *pvmw)
{
/* HugeTLB pte is set to the relevant page table entry without pte_mapped. */
if (pvmw->pte && !PageHuge(pvmw->page))
if (pvmw->pte && !is_vm_hugetlb_page(pvmw->vma))
pte_unmap(pvmw->pte);
if (pvmw->ptl)
spin_unlock(pvmw->ptl);