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Sun, 15 Jun 2025 13:55:21 -0700 (PDT) Received: from tamird-mac.local ([2600:4041:5be7:7c00:b0c6:92db:d807:21a6]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6fb35c84148sm43468176d6.109.2025.06.15.13.55.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 15 Jun 2025 13:55:21 -0700 (PDT) From: Tamir Duberstein Date: Sun, 15 Jun 2025 16:55:09 -0400 Subject: [PATCH v12 5/6] rust: enable `clippy::cast_lossless` lint Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250615-ptr-as-ptr-v12-5-f43b024581e8@gmail.com> References: <20250615-ptr-as-ptr-v12-0-f43b024581e8@gmail.com> In-Reply-To: <20250615-ptr-as-ptr-v12-0-f43b024581e8@gmail.com> To: Masahiro Yamada , Nathan Chancellor , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Greg Kroah-Hartman , "Rafael J. Wysocki" , Brendan Higgins , David Gow , Rae Moar , Bjorn Helgaas , Luis Chamberlain , Russ Weight , Rob Herring , Saravana Kannan , Abdiel Janulgue , Daniel Almeida , Robin Murphy , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , FUJITA Tomonori , Nicolas Schier , Frederic Weisbecker , Lyude Paul , Thomas Gleixner , Anna-Maria Behnsen , Benno Lossin , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , John Stultz , Stephen Boyd , Lorenzo Stoakes , "Liam R. Howlett" , Breno Leitao , Viresh Kumar , Nicolas Schier Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, linux-pci@vger.kernel.org, linux-block@vger.kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, netdev@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, nouveau@lists.freedesktop.org, Tamir Duberstein , Benno Lossin X-Mailer: b4 0.15-dev Before Rust 1.29.0, Clippy introduced the `cast_lossless` lint [1]: > Rust’s `as` keyword will perform many kinds of conversions, including > silently lossy conversions. Conversion functions such as `i32::from` > will only perform lossless conversions. Using the conversion functions > prevents conversions from becoming silently lossy if the input types > ever change, and makes it clear for people reading the code that the > conversion is lossless. While this doesn't eliminate unchecked `as` conversions, it makes such conversions easier to scrutinize. It also has the slight benefit of removing a degree of freedom on which to bikeshed. Thus apply the changes and enable the lint -- no functional change intended. Link: https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless [1] Suggested-by: Benno Lossin Link: https://lore.kernel.org/all/D8ORTXSUTKGL.1KOJAGBM8F8TN@proton.me/ Reviewed-by: Benno Lossin Reviewed-by: Boqun Feng Signed-off-by: Tamir Duberstein --- Makefile | 1 + drivers/gpu/drm/drm_panic_qr.rs | 4 ++-- drivers/gpu/nova-core/regs.rs | 2 +- drivers/gpu/nova-core/regs/macros.rs | 2 +- rust/bindings/lib.rs | 1 + rust/kernel/net/phy.rs | 4 ++-- rust/uapi/lib.rs | 1 + 7 files changed, 9 insertions(+), 6 deletions(-) diff --git a/Makefile b/Makefile index 0ba22c361de8..29cf39be14de 100644 --- a/Makefile +++ b/Makefile @@ -481,6 +481,7 @@ export rust_common_flags := --edition=2021 \ -Wclippy::all \ -Wclippy::as_ptr_cast_mut \ -Wclippy::as_underscore \ + -Wclippy::cast_lossless \ -Wclippy::ignored_unit_patterns \ -Wclippy::mut_mut \ -Wclippy::needless_bitwise_bool \ diff --git a/drivers/gpu/drm/drm_panic_qr.rs b/drivers/gpu/drm/drm_panic_qr.rs index dd55b1cb764d..6b59d19ab631 100644 --- a/drivers/gpu/drm/drm_panic_qr.rs +++ b/drivers/gpu/drm/drm_panic_qr.rs @@ -404,7 +404,7 @@ fn pop3(&mut self) -> Option<(u16, usize)> { let mut out = 0; let mut exp = 1; for i in 0..poplen { - out += self.decimals[self.len + i] as u16 * exp; + out += u16::from(self.decimals[self.len + i]) * exp; exp *= 10; } Some((out, NUM_CHARS_BITS[poplen])) @@ -425,7 +425,7 @@ fn next(&mut self) -> Option { match self.segment { Segment::Binary(data) => { if self.offset < data.len() { - let byte = data[self.offset] as u16; + let byte = u16::from(data[self.offset]); self.offset += 1; Some((byte, 8)) } else { diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs index 5a1273230306..c1cb6d4c49ee 100644 --- a/drivers/gpu/nova-core/regs.rs +++ b/drivers/gpu/nova-core/regs.rs @@ -32,7 +32,7 @@ pub(crate) fn architecture(self) -> Result { pub(crate) fn chipset(self) -> Result { self.architecture() .map(|arch| { - ((arch as u32) << Self::IMPLEMENTATION.len()) | self.implementation() as u32 + ((arch as u32) << Self::IMPLEMENTATION.len()) | u32::from(self.implementation()) }) .and_then(Chipset::try_from) } diff --git a/drivers/gpu/nova-core/regs/macros.rs b/drivers/gpu/nova-core/regs/macros.rs index 7ecc70efb3cd..6851af8b5885 100644 --- a/drivers/gpu/nova-core/regs/macros.rs +++ b/drivers/gpu/nova-core/regs/macros.rs @@ -264,7 +264,7 @@ pub(crate) fn $field(self) -> $res_type { pub(crate) fn [](mut self, value: $to_type) -> Self { const MASK: u32 = $name::[<$field:upper _MASK>]; const SHIFT: u32 = $name::[<$field:upper _SHIFT>]; - let value = ((value as u32) << SHIFT) & MASK; + let value = (u32::from(value) << SHIFT) & MASK; self.0 = (self.0 & !MASK) | value; self diff --git a/rust/bindings/lib.rs b/rust/bindings/lib.rs index 81b6c7aa4916..7631c9f6708d 100644 --- a/rust/bindings/lib.rs +++ b/rust/bindings/lib.rs @@ -25,6 +25,7 @@ )] #[allow(dead_code)] +#[allow(clippy::cast_lossless)] #[allow(clippy::ptr_as_ptr)] #[allow(clippy::undocumented_unsafe_blocks)] #[cfg_attr(CONFIG_RUSTC_HAS_UNNECESSARY_TRANSMUTES, allow(unnecessary_transmutes))] diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs index 32ea43ece646..65ac4d59ad77 100644 --- a/rust/kernel/net/phy.rs +++ b/rust/kernel/net/phy.rs @@ -142,7 +142,7 @@ pub fn is_autoneg_enabled(&self) -> bool { // SAFETY: The struct invariant ensures that we may access // this field without additional synchronization. let bit_field = unsafe { &(*self.0.get())._bitfield_1 }; - bit_field.get(13, 1) == bindings::AUTONEG_ENABLE as u64 + bit_field.get(13, 1) == u64::from(bindings::AUTONEG_ENABLE) } /// Gets the current auto-negotiation state. @@ -427,7 +427,7 @@ impl Adapter { // where we hold `phy_device->lock`, so the accessors on // `Device` are okay to call. let dev = unsafe { Device::from_raw(phydev) }; - T::match_phy_device(dev) as i32 + T::match_phy_device(dev).into() } /// # Safety diff --git a/rust/uapi/lib.rs b/rust/uapi/lib.rs index e79a1f49f055..08e68ebef606 100644 --- a/rust/uapi/lib.rs +++ b/rust/uapi/lib.rs @@ -14,6 +14,7 @@ #![cfg_attr(test, allow(unsafe_op_in_unsafe_fn))] #![allow( clippy::all, + clippy::cast_lossless, clippy::ptr_as_ptr, clippy::undocumented_unsafe_blocks, dead_code,