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([2600:8800:41a0:8000:b70:255d:b0d5:dc80]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2b855af7806sm5799442eec.10.2026.02.08.06.01.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Feb 2026 06:01:11 -0800 (PST) From: Jason Hall To: Dirk Behme Cc: Miguel Ojeda , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v9 2/2] scripts: checkpatch: add RUST_UNWRAP lint Date: Sun, 8 Feb 2026 07:01:10 -0700 Message-ID: <20260208140110.258311-1-jason.kei.hall@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <9ecadaa2-0f6b-411f-9faf-0ecc93b26bc2@gmail.com> References: <9ecadaa2-0f6b-411f-9faf-0ecc93b26bc2@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Dirk, I have been playing around with the lint logic. It now identifies when we enter a test-related block (like mod tests, #[test], or KUnit macros) and suppresses the warning for that specific context. This handles the false positives you encountered in the Binder patch while still catching "lazy" unwraps in production logic. I tested the scenarios laid out below. Proposed Logic: my $in_rust_test_context = 0; sub process_rust { my ($line, $rawline, $herecurr) = @_; if ($rawline =~ /^(?:@@|diff --git)/) { $in_rust_test_context = 0; } if ($line =~ /^\+\s*(?:mod\s+tests|#\[.*(?:test|kunit))/) { $in_rust_test_context = 1; } if ($line =~ /^\+/ && !$in_rust_test_context) { if ($line =~ /(?:\.|::)(?:unwrap|expect)\s*\(/ && $rawline !~ /\/\/\s*PANIC:/ && $line !~ /^\+\s*\/\// && $line !~ /^\+\s*assert/) { return ("RUST_UNWRAP", "..."); } } return (); } Scenarios: --- a/rust/kernel/alloc/kvec.rs +++ b/rust/kernel/alloc/kvec.rs @@ -42,6 +42,7 @@ pub fn new_with_data() -> Self { - let x = Some(1); + // Scenario 1: Production code (SHOULD WARN) + let val = some_kernel_function().unwrap(); Vec { ptr: NonNull::dangling(), len: 0 } } @@ -150,6 +151,13 @@ + // Scenario 2: Explicitly justified (SHOULD NOT WARN) + pub fn proof_of_concept() { + let x = core::ptr::NonNull::new(ptr).unwrap(); // PANIC: ptr is never null here + } + + // Scenario 3: Already a comment (SHOULD NOT WARN) + // let x = something.unwrap(); + @@ -200,10 +208,20 @@ +#[test] +fn scenario_4_standalone_test() { + // SHOULD NOT WARN because of #[test] above + let v: KVec = KVec::with_capacity(1, GFP_KERNEL).unwrap(); +} + +#[macros::kunit_tests(rust_kvec)] +mod tests { + use super::*; + + fn test_internal_logic() { + // Scenario 5: Inside KUnit mod (SHOULD NOT WARN) + // Dirk's specific 21 warnings happened in a block like this. + let mut v = KVec::new(); + v.push(1, GFP_KERNEL).unwrap(); + assert_eq!(v.pop().unwrap(), 1); + } +} If this looks okay, I can resubmit the patch series with this. Best regards, Jason