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s390/mm: Allocate page table with PAGE_SIZE granularity 

Make vmem_pte_alloc() consistent by always allocating page table of
PAGE_SIZE granularity, regardless of whether page_table_alloc() (with
slab) or memblock_alloc() is used. This ensures page table can be fully
freed when the corresponding page table entries are removed.

Fixes: d08d4e7cd6 ("s390/mm: use full 4KB page for 2KB PTE")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
pull/1316/head
Sumanth Korikkar 2025-08-04 11:57:03 +02:00 committed by Alexander Gordeev
parent 10dd5a0009
commit daa8af80d2
1 changed files with 2 additions and 3 deletions
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5
arch/s390/mm/vmem.c
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@ -64,13 +64,12 @@ void *vmem_crst_alloc(unsigned long val)
pte_t __ref *vmem_pte_alloc(void)
{
unsigned long size = PTRS_PER_PTE * sizeof(pte_t);
pte_t *pte;
if (slab_is_available())
pte = (pte_t *) page_table_alloc(&init_mm);
pte = (pte_t *)page_table_alloc(&init_mm);
else
pte = (pte_t *) memblock_alloc(size, size);
pte = (pte_t *)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pte)
return NULL;
memset64((u64 *)pte, _PAGE_INVALID, PTRS_PER_PTE);