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s390/mm: use compound page order to distinguish page tables

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CRSTs always have size of four pages, while 2KB-size page tables
always occupy a single page. Use that information to distinguish
page tables from CRSTs.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2023-11-03 16:40:13 +01:00 • committed by Vasily Gorbik
parent d08d4e7cd6
commit 0031f1c7cf
1 changed files with 4 additions and 9 deletions
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13
arch/s390/mm/pgalloc.c
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@ -199,20 +199,15 @@ void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table,
mm = tlb->mm;
if (mm_alloc_pgste(mm))
gmap_unlink(mm, table, vmaddr);
table = (unsigned long *)((unsigned long)table | 0x01U);
tlb_remove_ptdesc(tlb, table);
}
void __tlb_remove_table(void *_table)
void __tlb_remove_table(void *table)
{
struct ptdesc *ptdesc;
unsigned int mask;
void *table;
struct ptdesc *ptdesc = virt_to_ptdesc(table);
struct page *page = ptdesc_page(ptdesc);
mask = (unsigned long)_table & 0x01U;
table = (void *)((unsigned long)_table ^ mask);
ptdesc = virt_to_ptdesc(table);
if (!mask) {
if (compound_order(page) == CRST_ALLOC_ORDER) {
/* pmd, pud, or p4d */
pagetable_free(ptdesc);
return;