linux-kernel - [PATCH] riscv: mm: define copy_user_page() as copy

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Message-ID: <20260113134025.905627-1-florian.schmaus@codasip.com>
Date: Tue, 13 Jan 2026 14:40:25 +0100
From: Florian Schmaus <florian.schmaus@...asip.com>
To: Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Florian Schmaus <florian.schmaus@...asip.com>
Subject: [PATCH] riscv: mm: define copy_user_page() as copy_page()

Currently, the implementation of copy_user_page() is identical to
copy_page().

Align riscv with other architectures (alpha, arc, arm64, hexagon,
longarch, m68k, openrisc, s390, um, xtensa) and map copy_user_page()
to copy_page() given that their implementation is identical.

In addition to following a common pattern, this centralizes the
implementation. Any changes to the underlying page copy logic (e.g.,
for CHERI) will now automatically propagate to copy_user_page().

Signed-off-by: Florian Schmaus <florian.schmaus@...asip.com>
---
 arch/riscv/include/asm/page.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index ffe213ad65a4..3c517bc9eac5 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -51,8 +51,7 @@ void clear_page(void *page);
 #define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
 
 #define clear_user_page(pgaddr, vaddr, page)	clear_page(pgaddr)
-#define copy_user_page(vto, vfrom, vaddr, topg) \
-			memcpy((vto), (vfrom), PAGE_SIZE)
+#define copy_user_page(vto, vfrom, vaddr, topg) copy_page(vto, vfrom)
 
 /*
  * Use struct definitions to apply C type checking
-- 
2.52.0