From: Pedro Falcato <pfalcato@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>
Cc: Pedro Falcato <pfalcato@suse.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
Jan Kara <jack@suse.cz>, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Nico Pache <npache@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Muhammad Usama Anjum <usama.anjum@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: [PATCH 2/5] mm/arm64: constify pte_get*() and contpte get logic
Date: Fri, 24 Jul 2026 11:20:14 +0100 [thread overview]
Message-ID: <20260724102017.141532-3-pfalcato@suse.de> (raw)
In-Reply-To: <20260724102017.141532-1-pfalcato@suse.de>
None of the contpte code needs write access to the PTEs.
Signed-off-by: Pedro Falcato <pfalcato@suse.de>
---
arch/arm64/include/asm/pgtable.h | 10 +++++-----
arch/arm64/mm/contpte.c | 4 ++--
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index a2681d755358..043bc0649cee 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -378,7 +378,7 @@ static inline void __set_pte(pte_t *ptep, pte_t pte)
__set_pte_complete(pte);
}
-static inline pte_t __ptep_get(pte_t *ptep)
+static inline pte_t __ptep_get(const pte_t *ptep)
{
return READ_ONCE(*ptep);
}
@@ -1652,8 +1652,8 @@ extern void __contpte_try_fold(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
extern void __contpte_try_unfold(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
-extern pte_t contpte_ptep_get(pte_t *ptep, pte_t orig_pte);
-extern pte_t contpte_ptep_get_lockless(pte_t *orig_ptep);
+extern pte_t contpte_ptep_get(const pte_t *ptep, pte_t orig_pte);
+extern pte_t contpte_ptep_get_lockless(const pte_t *orig_ptep);
extern void contpte_set_ptes(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte, unsigned int nr);
extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr,
@@ -1732,7 +1732,7 @@ static inline unsigned int pte_batch_hint(pte_t *ptep, pte_t pte)
*/
#define ptep_get ptep_get
-static inline pte_t ptep_get(pte_t *ptep)
+static inline pte_t ptep_get(const pte_t *ptep)
{
pte_t pte = __ptep_get(ptep);
@@ -1743,7 +1743,7 @@ static inline pte_t ptep_get(pte_t *ptep)
}
#define ptep_get_lockless ptep_get_lockless
-static inline pte_t ptep_get_lockless(pte_t *ptep)
+static inline pte_t ptep_get_lockless(const pte_t *ptep)
{
pte_t pte = __ptep_get(ptep);
diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c
index 2de12656b4d8..3853ecd2cee9 100644
--- a/arch/arm64/mm/contpte.c
+++ b/arch/arm64/mm/contpte.c
@@ -310,7 +310,7 @@ void __contpte_try_unfold(struct mm_struct *mm, unsigned long addr,
}
EXPORT_SYMBOL_GPL(__contpte_try_unfold);
-pte_t contpte_ptep_get(pte_t *ptep, pte_t orig_pte)
+pte_t contpte_ptep_get(const pte_t *ptep, pte_t orig_pte)
{
/*
* Gather access/dirty bits, which may be populated in any of the ptes
@@ -367,7 +367,7 @@ static inline bool contpte_is_consistent(pte_t pte, unsigned long pfn,
pgprot_val(prot) == pgprot_val(orig_prot);
}
-pte_t contpte_ptep_get_lockless(pte_t *orig_ptep)
+pte_t contpte_ptep_get_lockless(const pte_t *orig_ptep)
{
/*
* The ptep_get_lockless() API requires us to read and return *orig_ptep
--
2.55.0
next prev parent reply other threads:[~2026-07-24 10:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-24 10:20 [PATCH 0/5] mm: add basic PTE const type-safety Pedro Falcato
2026-07-24 10:20 ` [PATCH 1/5] mm: constify generic pte_get*() Pedro Falcato
2026-07-24 10:20 ` Pedro Falcato [this message]
2026-07-24 10:20 ` [PATCH 3/5] mm/parisc: constify ptep_get() argument Pedro Falcato
2026-07-24 10:20 ` [PATCH 4/5] mm/powerpc/8xx: " Pedro Falcato
2026-07-24 10:20 ` [PATCH 5/5] mm: constify the pte_offset_map_ro_nolock() return value Pedro Falcato
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