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Thu, 23 Oct 2025 10:16:09 -0700 (PDT) Received: from localhost ([12.22.141.131]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-87f9e824cc2sm18692156d6.61.2025.10.23.10.16.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Oct 2025 10:16:09 -0700 (PDT) From: "Yury Norov (NVIDIA)" To: Miguel Ojeda , Alice Ryhl , Boqun Feng , Danilo Krummrich Cc: "Yury Norov (NVIDIA)" , Andrew Morton , Arnd Bergmann , Alex Gaynor , Gary Guo , John Hubbard , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org Subject: [PATCH] uaccess: decouple INLINE_COPY_FROM_USER and CONFIG_RUST Date: Thu, 23 Oct 2025 13:16:06 -0400 Message-ID: <20251023171607.1171534-1-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Commit 1f9a8286bc0c ("uaccess: always export _copy_[from|to]_user with CONFIG_RUST") exports _copy_{from,to}_user() unconditionally, if RUST is enabled. This pollutes exported symbols namespace, and spreads RUST ifdefery in core files. It's better to declare a corresponding helper under the rust/helpers, similarly to how non-underscored copy_{from,to}_user() is handled. Signed-off-by: Yury Norov (NVIDIA) Reviewed-by: Alice Ryhl Tested-by: Alice Ryhl --- lib/usercopy.c | 4 ++-- rust/helpers/uaccess.c | 12 ++++++++++++ 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/lib/usercopy.c b/lib/usercopy.c index 7b17b83c8042..b00a3a957de6 100644 --- a/lib/usercopy.c +++ b/lib/usercopy.c @@ -12,7 +12,7 @@ =20 /* out-of-line parts */ =20 -#if !defined(INLINE_COPY_FROM_USER) || defined(CONFIG_RUST) +#if !defined(INLINE_COPY_FROM_USER) unsigned long _copy_from_user(void *to, const void __user *from, unsigned = long n) { return _inline_copy_from_user(to, from, n); @@ -20,7 +20,7 @@ unsigned long _copy_from_user(void *to, const void __user= *from, unsigned long n EXPORT_SYMBOL(_copy_from_user); #endif =20 -#if !defined(INLINE_COPY_TO_USER) || defined(CONFIG_RUST) +#if !defined(INLINE_COPY_TO_USER) unsigned long _copy_to_user(void __user *to, const void *from, unsigned lo= ng n) { return _inline_copy_to_user(to, from, n); diff --git a/rust/helpers/uaccess.c b/rust/helpers/uaccess.c index f49076f813cd..4629b2d15529 100644 --- a/rust/helpers/uaccess.c +++ b/rust/helpers/uaccess.c @@ -13,3 +13,15 @@ unsigned long rust_helper_copy_to_user(void __user *to, = const void *from, { return copy_to_user(to, from, n); } + +#ifdef INLINE_COPY_FROM_USER +unsigned long rust_helper__copy_from_user(void *to, const void __user *fro= m, unsigned long n) +{ + return _inline_copy_from_user(to, from, n); +} + +unsigned long rust_helper__copy_to_user(void __user *to, const void *from,= unsigned long n) +{ + return _inline_copy_to_user(to, from, n); +} +#endif --=20 2.43.0