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mm/swapoff: allow pte_offset_map[_lock]() to fail 

JIRA: https://issues.redhat.com/browse/RHEL-1848

commit d850fa729873787a4030eed5fd875d00eb63946b
Author: Hugh Dickins <hughd@google.com>
Date:   Thu Jun 8 18:36:11 2023 -0700

    mm/swapoff: allow pte_offset_map[_lock]() to fail

    Adjust unuse_pte() and unuse_pte_range() to allow pte_offset_map_lock()
    and pte_offset_map() failure; remove pmd_none_or_trans_huge_or_clear_bad()
    from unuse_pmd_range() now that pte_offset_map() does all that itself.

    Link: https://lkml.kernel.org/r/c4d831-13c3-9dfd-70c2-64514ad951fd@google.com
    Signed-off-by: Hugh Dickins <hughd@google.com>
    Cc: Alistair Popple <apopple@nvidia.com>
    Cc: Anshuman Khandual <anshuman.khandual@arm.com>
    Cc: Axel Rasmussen <axelrasmussen@google.com>
    Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: David Hildenbrand <david@redhat.com>
    Cc: "Huang, Ying" <ying.huang@intel.com>
    Cc: Ira Weiny <ira.weiny@intel.com>
    Cc: Jason Gunthorpe <jgg@ziepe.ca>
    Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: Lorenzo Stoakes <lstoakes@gmail.com>
    Cc: Matthew Wilcox <willy@infradead.org>
    Cc: Mel Gorman <mgorman@techsingularity.net>
    Cc: Miaohe Lin <linmiaohe@huawei.com>
    Cc: Mike Kravetz <mike.kravetz@oracle.com>
    Cc: Mike Rapoport (IBM) <rppt@kernel.org>
    Cc: Minchan Kim <minchan@kernel.org>
    Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
    Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
    Cc: Peter Xu <peterx@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Qi Zheng <zhengqi.arch@bytedance.com>
    Cc: Ralph Campbell <rcampbell@nvidia.com>
    Cc: Ryan Roberts <ryan.roberts@arm.com>
    Cc: SeongJae Park <sj@kernel.org>
    Cc: Song Liu <song@kernel.org>
    Cc: Steven Price <steven.price@arm.com>
    Cc: Suren Baghdasaryan <surenb@google.com>
    Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
    Cc: Will Deacon <will@kernel.org>
    Cc: Yang Shi <shy828301@gmail.com>
    Cc: Yu Zhao <yuzhao@google.com>
    Cc: Zack Rusin <zackr@vmware.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Chris von Recklinghausen <crecklin@redhat.com>
This commit is contained in:
Chris von Recklinghausen 2023-10-20 06:16:18 -04:00
parent d0f48d61f7
commit e6131c89a5
1 changed files with 20 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
mm/swapfile.c
View File

@ -1773,7 +1773,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
return -ENOMEM;
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
if (unlikely(!pte_same_as_swp(*pte, swp_entry_to_pte(entry)))) {
if (unlikely(!pte || !pte_same_as_swp(*pte, swp_entry_to_pte(entry)))) {
ret = 0;
goto out;
}
@ -1821,7 +1821,8 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
set_pte_at(vma->vm_mm, addr, pte, new_pte);
swap_free(entry);
out:
pte_unmap_unlock(pte, ptl);
if (pte)
pte_unmap_unlock(pte, ptl);
if (page != swapcache) {
unlock_page(page);
put_page(page);
@ -1833,17 +1834,22 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
unsigned int type)
{
swp_entry_t entry;
pte_t *pte;
pte_t *pte = NULL;
struct swap_info_struct *si;
int ret = 0;
si = swap_info[type];
pte = pte_offset_map(pmd, addr);
do {
struct folio *folio;
unsigned long offset;
unsigned char swp_count;
swp_entry_t entry;
int ret;
if (!pte++) {
pte = pte_offset_map(pmd, addr);
if (!pte)
break;
}
if (!is_swap_pte(*pte))
continue;
@ -1854,6 +1860,8 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
offset = swp_offset(entry);
pte_unmap(pte);
pte = NULL;
folio = swap_cache_get_folio(entry, vma, addr);
if (!folio) {
struct page *page;
@ -1872,8 +1880,7 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
if (!folio) {
swp_count = READ_ONCE(si->swap_map[offset]);
if (swp_count == 0 || swp_count == SWAP_MAP_BAD)
goto try_next;
continue;
return -ENOMEM;
}
@ -1883,20 +1890,17 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
if (ret < 0) {
folio_unlock(folio);
folio_put(folio);
goto out;
return ret;
}
folio_free_swap(folio);
folio_unlock(folio);
folio_put(folio);
try_next:
pte = pte_offset_map(pmd, addr);
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
} while (addr += PAGE_SIZE, addr != end);
ret = 0;
out:
return ret;
if (pte)
pte_unmap(pte);
return 0;
}
static inline int unuse_pmd_range(struct vm_area_struct *vma, pud_t *pud,
@ -1911,8 +1915,6 @@ static inline int unuse_pmd_range(struct vm_area_struct *vma, pud_t *pud,
do {
cond_resched();
next = pmd_addr_end(addr, end);
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
continue;
ret = unuse_pte_range(vma, pmd, addr, next, type);
if (ret)
return ret;