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| author | Alexander Gordeev <agordeev@linux.ibm.com> | 2023-11-03 16:40:13 +0100 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2023-11-05 22:34:58 +0100 |
| commit | 0031f1c7cf2632a068a80261071b9b1f2d32d836 (patch) | |
| tree | 4737f15084b49e53a26d1dd8d67302570356cc8c /arch/s390 | |
| parent | d08d4e7cd6bffe333f09853005aa549a8d57614b (diff) | |
| download | lwn-0031f1c7cf2632a068a80261071b9b1f2d32d836.tar.gz lwn-0031f1c7cf2632a068a80261071b9b1f2d32d836.zip | |
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: 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>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/mm/pgalloc.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c index 5b15b45941c6..8159f4fade3f 100644 --- a/arch/s390/mm/pgalloc.c +++ b/arch/s390/mm/pgalloc.c @@ -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; |