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Thu, 30 Apr 2026 11:15:01 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48a7c324672sm46413585e9.32.2026.04.30.11.15.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2026 11:15:00 -0700 (PDT) Date: Thu, 30 Apr 2026 21:14:57 +0300 From: Dan Carpenter To: Alexander Potapenko Cc: kernel-janitors@vger.kernel.org Subject: [bug report] lib: introduce test_meminit module Message-ID: Precedence: bulk X-Mailing-List: kernel-janitors@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello Alexander Potapenko, Commit 5015a300a522 ("lib: introduce test_meminit module") from Jul 16, 2019 (linux-next), leads to the following Smatch static checker warning: lib/test_meminit.c:390 test_kmemcache() warn: bool mask is always false 'ctor & zero' lib/test_meminit.c 378 static int __init test_kmemcache(int *total_failures) 379 { 380 int failures = 0, num_tests = 0; 381 int i, flags, size; 382 bool ctor, rcu, zero; 383 384 for (i = 0; i < 10; i++) { 385 size = 8 << i; 386 for (flags = 0; flags < 8; flags++) { 387 ctor = flags & 1; 388 rcu = flags & 2; 389 zero = flags & 4; --> 390 if (ctor & zero) ^^^^^^^^^^^ This is like (BIT(1) & BIT(4)) so it can't be true. Was && intended? 391 continue; 392 num_tests += do_kmem_cache_size(size, ctor, rcu, zero, 393 &failures); 394 } 395 num_tests += do_kmem_cache_size_bulk(size, &failures); 396 } 397 REPORT_FAILURES_IN_FN(); 398 *total_failures += failures; 399 return num_tests; 400 } This email is a free service from the Smatch-CI project [smatch.sf.net]. regards, dan carpenter