linux-kernel - [PATCH v1 4/5] mm: ptdump: Support hugepd table entries

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Date:   Thu, 15 Apr 2021 17:18:17 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Steven Price <steven.price@....com>, akpm@...ux-foundation.org
Cc:     linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, x86@...nel.org, linux-mm@...ck.org
Subject: [PATCH v1 4/5] mm: ptdump: Support hugepd table entries

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 <christophe.leroy@...roup.eu>
---
 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