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mm/rmap: add hugetlb sanity checks for anon rmap handling

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Let's make sure we end up with the right folios in the right functions
when adding an anon rmap, just like we already do in the other rmap
functions.

Link: https://lkml.kernel.org/r/20231220224504.646757-7-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2023-12-20 23:44:30 +01:00 committed by Andrew Morton
parent 0c2ec32bf0
commit a4ea18641d
1 changed files with 6 additions and 0 deletions
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6
mm/rmap.c
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@ -1262,6 +1262,8 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
bool compound = flags & RMAP_COMPOUND;
bool first;
VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio);
/* Is page being mapped by PTE? Is this its first map to be added? */
if (likely(!compound)) {
first = atomic_inc_and_test(&page->_mapcount);
@ -1343,6 +1345,7 @@ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
{
int nr = folio_nr_pages(folio);
VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio);
VM_BUG_ON_VMA(address < vma->vm_start ||
address + (nr << PAGE_SHIFT) > vma->vm_end, vma);
__folio_set_swapbacked(folio);
@ -2634,6 +2637,7 @@ void rmap_walk_locked(struct folio *folio, struct rmap_walk_control *rwc)
void hugetlb_add_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
unsigned long address, rmap_t flags)
{
VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio);
VM_WARN_ON_FOLIO(!folio_test_anon(folio), folio);
atomic_inc(&folio->_entire_mapcount);
@ -2646,6 +2650,8 @@ void hugetlb_add_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
void hugetlb_add_new_anon_rmap(struct folio *folio,
struct vm_area_struct *vma, unsigned long address)
{
VM_WARN_ON_FOLIO(!folio_test_hugetlb(folio), folio);
BUG_ON(address < vma->vm_start || address >= vma->vm_end);
/* increment count (starts at -1) */
atomic_set(&folio->_entire_mapcount, 0);