linux-kernel - [tip:x86/mm] x86/mm: Fix dump pagetables for 4 levels of page tables

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Message-ID: <tip-84bbabc3a452e8085cfbd745ff0bff2b89074417@git.kernel.org>
Date:   Wed, 12 Apr 2017 15:31:46 -0700
From:   tip-bot for Juergen Gross <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, kirill.shutemov@...ux.intel.com, mingo@...nel.org,
        jgross@...e.com, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: [tip:x86/mm] x86/mm: Fix dump pagetables for 4 levels of page
 tables

Commit-ID:  84bbabc3a452e8085cfbd745ff0bff2b89074417
Gitweb:     http://git.kernel.org/tip/84bbabc3a452e8085cfbd745ff0bff2b89074417
Author:     Juergen Gross <jgross@...e.com>
AuthorDate: Wed, 12 Apr 2017 16:36:34 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 13 Apr 2017 00:26:30 +0200

x86/mm: Fix dump pagetables for 4 levels of page tables

Commit fdd3d8ce0ea62 ("x86/dump_pagetables: Add support for 5-level
paging") introduced an error for dumping with only 4 levels by setting
PGD_LEVEL_MULT to a wrong value.

This is leading to e.g. addresses printed as "(null)" for ranges:

  x86/mm: Found insecure W+X mapping at address (null)/(null)

Make PGD_LEVEL_MULT a multiple of PTRS_PER_P4D instead of PTRS_PER_PUD

Fixes: fdd3d8ce0ea62 ("x86/dump_pagetables: Add support for 5-level paging")
Signed-off-by: Juergen Gross <jgross@...e.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Link: http://lkml.kernel.org/r/20170412143634.6846-1-jgross@suse.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/mm/dump_pagetables.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 9f305be..bce6990 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -111,7 +111,7 @@ static struct addr_marker address_markers[] = {
 #define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
 #define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
 #define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
-#define PGD_LEVEL_MULT (PTRS_PER_PUD * P4D_LEVEL_MULT)
+#define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)
 
 #define pt_dump_seq_printf(m, to_dmesg, fmt, args...)		\
 ({								\