Received-SPF: pass (google.com: domain of linux-kernel+bounces-106604-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
From: peterx@redhat.com
To: linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	x86@kernel.org,
	Muchun Song <muchun.song@linux.dev>,
	Mike Rapoport <rppt@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	sparclinux@vger.kernel.org,
	Jason Gunthorpe <jgg@nvidia.com>,
	linuxppc-dev@lists.ozlabs.org,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	linux-arm-kernel@lists.infradead.org,
	peterx@redhat.com,
	Mark Salter <msalter@redhat.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Subject: [PATCH v2 08/14] mm/arm64: Merge pXd_huge() and pXd_leaf() definitions
Date: Mon, 18 Mar 2024 16:03:58 -0400
Message-ID: <20240318200404.448346-9-peterx@redhat.com>
In-Reply-To: <20240318200404.448346-1-peterx@redhat.com>
References: <20240318200404.448346-1-peterx@redhat.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: Peter Xu <peterx@redhat.com>

Unlike most archs, aarch64 defines pXd_huge() and pXd_leaf() slightly
differently.  Redefine the pXd_huge() with pXd_leaf().

There used to be two traps for old aarch64 definitions over these APIs that
I found when reading the code around, they're:

 (1) 4797ec2dc83a ("arm64: fix pud_huge() for 2-level pagetables")
 (2) 23bc8f69f0ec ("arm64: mm: fix p?d_leaf()")

Define pXd_huge() with the current pXd_leaf() will make sure (2) isn't a
problem (on PROT_NONE checks). To make sure it also works for (1), we move
over the __PAGETABLE_PMD_FOLDED check to pud_leaf(), allowing it to
constantly returning "false" for 2-level pgtables, which looks even safer
to cover both now.

Cc: Muchun Song <muchun.song@linux.dev>
Cc: Mark Salter <msalter@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 arch/arm64/include/asm/pgtable.h | 4 ++++
 arch/arm64/mm/hugetlbpage.c      | 8 ++------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 401087e8a43d..14d24c357c7a 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -704,7 +704,11 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 #define pud_none(pud)		(!pud_val(pud))
 #define pud_bad(pud)		(!pud_table(pud))
 #define pud_present(pud)	pte_present(pud_pte(pud))
+#ifndef __PAGETABLE_PMD_FOLDED
 #define pud_leaf(pud)		(pud_present(pud) && !pud_table(pud))
+#else
+#define pud_leaf(pud)		false
+#endif
 #define pud_valid(pud)		pte_valid(pud_pte(pud))
 #define pud_user(pud)		pte_user(pud_pte(pud))
 #define pud_user_exec(pud)	pte_user_exec(pud_pte(pud))
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 0f0e10bb0a95..1234bbaef5bf 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -81,16 +81,12 @@ bool arch_hugetlb_migration_supported(struct hstate *h)
 
 int pmd_huge(pmd_t pmd)
 {
-	return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
+	return pmd_leaf(pmd);
 }
 
 int pud_huge(pud_t pud)
 {
-#ifndef __PAGETABLE_PMD_FOLDED
-	return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
-#else
-	return 0;
-#endif
+	return pud_leaf(pud);
 }
 
 static int find_num_contig(struct mm_struct *mm, unsigned long addr,
-- 
2.44.0