linux-kernel - [PATCH] iosys_map: Make dst a const in iosys_map_memcpy

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Message-ID: <20251016202455.2750217-1-lyude@redhat.com>
Date: Thu, 16 Oct 2025 16:24:55 -0400
From: Lyude Paul <lyude@...hat.com>
To: Thomas Zimmermann <tzimmermann@...e.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	rust-for-linux@...r.kernel.org (open list:RUST:Keyword:\b(?i:rust)\b)
Subject: [PATCH] iosys_map: Make dst a const in iosys_map_memcpy_to()

A drive-by fix I discovered when writing up bindings for iosys_mem for
rust: while iosys_map_memcpy_to() does modify the memory pointed to by the
iosys_map, it doesn't modify the actual iosys_map struct at all.

As such, let's add a const qualifier to this function.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 include/linux/iosys-map.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/iosys-map.h b/include/linux/iosys-map.h
index 3e85afe794c0a..0ececbba04b3a 100644
--- a/include/linux/iosys-map.h
+++ b/include/linux/iosys-map.h
@@ -278,7 +278,7 @@ static inline void iosys_map_clear(struct iosys_map *map)
  * system memory. Depending on the buffer's location, the helper picks the
  * correct method of accessing the memory.
  */
-static inline void iosys_map_memcpy_to(struct iosys_map *dst, size_t dst_offset,
+static inline void iosys_map_memcpy_to(const struct iosys_map *dst, size_t dst_offset,
 				       const void *src, size_t len)
 {
 	if (dst->is_iomem)

base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
-- 
2.51.0