linux-kernel - [PATCH 2/2] mm: ptdump: Expand type of 'val' in note

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Date:   Thu, 21 May 2020 16:23:08 +0100
From:   Steven Price <steven.price@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Jan Beulich <jbeulich@...e.com>
Cc:     Steven Price <steven.price@....com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH 2/2] mm: ptdump: Expand type of 'val' in note_page()

The page table entry is passed in the 'val' argument to note_page(),
however this was previously an "unsigned long" which is fine on 64-bit
platforms. But for 32 bit x86 it is not always big enough to contain a
page table entry which may be 64 bits.

Change the type to u64 to ensure that it is always big enough.

Reported-by: Jan Beulich <jbeulich@...e.com>
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/arm64/mm/dump.c          | 2 +-
 arch/x86/mm/dump_pagetables.c | 2 +-
 include/linux/ptdump.h        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
index 860c00ec8bd3..d4313bc0c4c1 100644
--- a/arch/arm64/mm/dump.c
+++ b/arch/arm64/mm/dump.c
@@ -247,7 +247,7 @@ static void note_prot_wx(struct pg_state *st, unsigned long addr)
 }
 
 static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
-		      unsigned long val)
+		      u64 val)
 {
 	struct pg_state *st = container_of(pt_st, struct pg_state, ptdump);
 	static const char units[] = "KMGTPE";
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 199bbb7fbd79..17aa7ac94a34 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -273,7 +273,7 @@ static void effective_prot(struct ptdump_state *pt_st, int level, u64 val)
  * print what we collected so far.
  */
 static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
-		      unsigned long val)
+		      u64 val)
 {
 	struct pg_state *st = container_of(pt_st, struct pg_state, ptdump);
 	pgprotval_t new_prot, new_eff;
diff --git a/include/linux/ptdump.h b/include/linux/ptdump.h
index ac01502763bf..2a3a95586425 100644
--- a/include/linux/ptdump.h
+++ b/include/linux/ptdump.h
@@ -13,7 +13,7 @@ struct ptdump_range {
 struct ptdump_state {
 	/* level is 0:PGD to 4:PTE, or -1 if unknown */
 	void (*note_page)(struct ptdump_state *st, unsigned long addr,
-			  int level, unsigned long val);
+			  int level, u64 val);
 	void (*effective_prot)(struct ptdump_state *st, int level, u64 val);
 	const struct ptdump_range *range;
 };
-- 
2.20.1