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Message-ID: <20240715192142.3241557-6-peterx@redhat.com>
Date: Mon, 15 Jul 2024 15:21:39 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Cc: Dave Jiang <dave.jiang@...el.com>,
Rik van Riel <riel@...riel.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Michael Ellerman <mpe@...erman.id.au>,
linuxppc-dev@...ts.ozlabs.org,
Matthew Wilcox <willy@...radead.org>,
Rick P Edgecombe <rick.p.edgecombe@...el.com>,
peterx@...hat.com,
Oscar Salvador <osalvador@...e.de>,
Mel Gorman <mgorman@...hsingularity.net>,
Andrew Morton <akpm@...ux-foundation.org>,
Borislav Petkov <bp@...en8.de>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Huang Ying <ying.huang@...el.com>,
"Kirill A . Shutemov" <kirill@...temov.name>,
"Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
Dan Williams <dan.j.williams@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Hugh Dickins <hughd@...gle.com>,
x86@...nel.org,
Nicholas Piggin <npiggin@...il.com>,
Vlastimil Babka <vbabka@...e.cz>,
Ingo Molnar <mingo@...hat.com>
Subject: [PATCH v3 5/8] mm/x86: Make pud_leaf() only cares about PSE bit
An entry should be reported as PUD leaf even if it's PROT_NONE, in which
case PRESENT bit isn't there. I hit bad pud without this when testing dax
1G on zapping a PROT_NONE PUD.
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: x86@...nel.org
Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: Peter Xu <peterx@...hat.com>
---
arch/x86/include/asm/pgtable.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 65b8e5bb902c..25fc6d809572 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1073,8 +1073,7 @@ static inline pmd_t *pud_pgtable(pud_t pud)
#define pud_leaf pud_leaf
static inline bool pud_leaf(pud_t pud)
{
- return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
- (_PAGE_PSE | _PAGE_PRESENT);
+ return pud_val(pud) & _PAGE_PSE;
}
static inline int pud_bad(pud_t pud)
--
2.45.0
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