[PATCH v1 4/5] mm: ptdump: Support hugepd table entries
From: Christophe Leroy <hidden>
Date: 2021-04-15 17:18:37
Also in:
linux-arch, linux-mm, linux-riscv, linux-s390, linuxppc-dev, lkml
Subsystem:
memory management, memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Which hugepd, page table entries can be at any level and can be of any size. Add support for them. Signed-off-by: Christophe Leroy <redacted> --- mm/ptdump.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/mm/ptdump.c b/mm/ptdump.c
index 61cd16afb1c8..6efdb8c15a7d 100644
--- a/mm/ptdump.c
+++ b/mm/ptdump.c@@ -112,11 +112,24 @@ static int ptdump_pte_entry(pte_t *pte, unsigned long addr, { struct ptdump_state *st = walk->private; pte_t val = ptep_get(pte); + unsigned long page_size = next - addr; + int level; + + if (page_size >= PGDIR_SIZE) + level = 0; + else if (page_size >= P4D_SIZE) + level = 1; + else if (page_size >= PUD_SIZE) + level = 2; + else if (page_size >= PMD_SIZE) + level = 3; + else + level = 4; if (st->effective_prot) - st->effective_prot(st, 4, pte_val(val)); + st->effective_prot(st, level, pte_val(val)); - st->note_page(st, addr, 4, pte_val(val), PAGE_SIZE); + st->note_page(st, addr, level, pte_val(val), page_size); return 0; }
--
2.25.0
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