linux-kernel - [PATCH 2/9] riscv: Safely remove huge_pte_offset() when manipulating NAPOT ptes

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Message-Id: <20240301091455.246686-3-alexghiti@rivosinc.com>
Date: Fri,  1 Mar 2024 10:14:48 +0100
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-mm@...ck.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH 2/9] riscv: Safely remove huge_pte_offset() when manipulating NAPOT ptes

The pte_t pointer is expected to point to the first entry of the NAPOT
mapping so no need to use huge_pte_offset(), similarly to what is done
in arm64.

Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
 arch/riscv/mm/hugetlbpage.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
index 3d84fbc5c572..2477d20c1497 100644
--- a/arch/riscv/mm/hugetlbpage.c
+++ b/arch/riscv/mm/hugetlbpage.c
@@ -274,7 +274,6 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 		return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
 
 	pte_num = arch_contpte_get_num_contig(ptep, 0, &pgsize);
-	ptep = huge_pte_offset(mm, addr, pte_num * pgsize);
 
 	orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
 
@@ -319,10 +318,8 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
 	}
 
 	pte_num = arch_contpte_get_num_contig(ptep, 0, &pgsize);
-	ptep = huge_pte_offset(mm, addr, pte_num * pgsize);
 
 	orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
-
 	orig_pte = pte_wrprotect(orig_pte);
 
 	set_ptes(mm, addr, ptep, orig_pte, pte_num);
-- 
2.39.2