Commit 0031f1c7 authored by Alexander Gordeev's avatar Alexander Gordeev Committed by Vasily Gorbik
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s390/mm: use compound page order to distinguish page tables 



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: default avatarHeiko Carstens <hca@linux.ibm.com>
Reviewed-by: default avatarGerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent d08d4e7c

arch/s390/mm/pgalloc.c

+4 −9
Original line number Diff line number Diff line
@@ -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;