From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0BDFA261B98 for ; Sun, 22 Feb 2026 15:24:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771773864; cv=none; b=tyvNK0iTSOJS5AjIbZ7LMx3dLTg9KJzjjXqiGaE+YQWxRyUO6eZi5DO/eZzKvETRAP1JKNGCUzQRv/CtZF/6lV2ax2ri9dZ+PTCxFtAK/PTQCLABLSAxGAj/m5EHxGkucmhDJwUeZhHLlqqII3d/mDwkaqVPUhWvjKmV9hcU5qI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771773864; c=relaxed/simple; bh=OqPH2XNoJQYbTe1B4RCY5CxGB3xPeTO+LglWfUekZS4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=B5kzrlRaOQKYF4qcDnOenYtrJAMAHOSgooF0TH/TR6VjxI0HW9jtOxt9s1JM6D0mPvIWLt+MsRO+AXMb045x8r7J5eFUa4ja09Tmh00znlZ+fESPIczglOdAkbf15pvNzJcQTUVUlUO07CUYHdsKEjsL8bxFiYYI/Q+9bK0Dyjc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=PbKpgPjE; arc=none smtp.client-ip=209.85.214.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PbKpgPjE" Received: by mail-pl1-f180.google.com with SMTP id d9443c01a7336-2aae4816912so25202725ad.2 for ; Sun, 22 Feb 2026 07:24:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1771773862; x=1772378662; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=OqPH2XNoJQYbTe1B4RCY5CxGB3xPeTO+LglWfUekZS4=; b=PbKpgPjEQFLscuJPZOhgvgtVpikPKke9xksd7bQ7bYVYA709iREj9wmsj7X2tClXnG siAmftVjXaxbQl5h7c+x7Hb81rWfz3SkKQHoX50iV2hygq5WaUGt2+jOyrgY9T+egaPR +LF5FvCJFQ3jzmyFiA66O23DQ7fg9IWsCGINFhiueSDW+QG/jykxk8MMmFxFzBFWfYd4 UBe0rFuJxwi/nkX1ShZyY+KydZp0iQ5FSG7WEJCRRwk8lS2jQw+Ix4iwZYi+raMENvxY qZ+KpBZSZEnOufc9GtSaxzJGQEoDUOrNx5Qsa7cDA9oaONYACs+BqdJ1OlHjUfNSQklo QE9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771773862; x=1772378662; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=OqPH2XNoJQYbTe1B4RCY5CxGB3xPeTO+LglWfUekZS4=; b=bMuz7kOeA6460P9t/xB7MpeU6+AVx3vKUJWSJaHh4WwAXM9tIpHmbKjLo0aQOaSAhW 3YEv3M+VLHLAtBx7u6vmo5jiF6I+q+SosPthQs9mkc4GXy62sAI4Aw1Awq9P4VBA5WFA MNX7Ty7W9nAl4d33OF43QOzLDtP2oIQTYOA5o0yjBJ++zb+Ne+NsHdszt+9VP7ckR6iX QhAM8tVLx7aqVPffPKfLlAsME9kaHmwGT8maZZuagMfJBIkG13v6SNfl8TqhJy9Ff53G 9eu51HkYjMF7RtrE1UiJaRMyz77hR5cKfStw5YPpioASVHUH9lkr4fl/Kf49ZVeWTeVt lV+Q== X-Forwarded-Encrypted: i=1; AJvYcCWzU/OrV6HZ8bMrxXSOqTkJhtFJbgzRKIR7a9NRDdeyms5J9BNE2SqTmsizjJWX1b5KtmP3zkKuGEA0lJQ=@vger.kernel.org X-Gm-Message-State: AOJu0Ywv4cpbw9eiZxDb7t5yyDRuammbtS4gACiQdg6F5+9eGdyu4ZVV Lu1C4fDMhaRz/WfcIII2OoUHfoN/GHWzjuBn4Bfwi8lltbC70vVTwO2v X-Gm-Gg: AZuq6aJ/9UD2fI2o43jPV6agc33kJR5S9u/msEqDtF+o5vS5rScjjFTUDsE2c/8Jjlu fC9RHEuUsq1szvNcbtoqulNcaYZhfgGk1G2r3vWgfRd3blkxbTQ2rCRmb3Iic1NGDjxsuFfRDMV sGvNxUThahPFRG248poTywCdazOLJe1o10PI7oINb7+okF2/mKAbIIs5kaPEbuaF3fIOsvr6+Cz iZbg6pHJ2HS6xLUXEt8oTa0k9wzDljt4Flnbd/7PD02KVWz8cVjdHgeh1KIaGInE9YnKhF5nIAb hcG+85enLeonEFktynN50Ay6+9yES6lrfvsJN1OssrqXlLniBxaEj1r9r3ouJJJKbjo6g7oKNrq VfDLhdJwjZtHys6hWS0O1bx9Srboaa2Se8ciio5fl7l8o5flXVvwi2EBQM9ixY/GLgADZpywtPG SXIBgUs3LfuZZo6x2K8SXn/AiRRvWDb8TKWuelgYbjOXU= X-Received: by 2002:a17:902:ea04:b0:2a7:a6fa:ede4 with SMTP id d9443c01a7336-2ad74547e12mr58203235ad.48.1771773862266; Sun, 22 Feb 2026 07:24:22 -0800 (PST) Received: from localhost.localdomain ([103.235.0.244]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ad74e34e9csm46494765ad.3.2026.02.22.07.24.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 Feb 2026 07:24:22 -0800 (PST) From: Rio To: rioo.tsukatsukii@gmail.com Cc: akpm@linux-foundation.org, feng.tang@linux.alibaba.com, joel.granados@kernel.org, linux-kernel@vger.kernel.org, pmladek@suse.com, pnina.feder@mobileye.com, wangjinchao600@gmail.com Subject: Re: [PATCHv2] kernel/panic: allocate taint string buffer dynamically Date: Sun, 22 Feb 2026 20:53:57 +0530 Message-ID: <20260222152357.26587-1-rioo.tsukatsukii@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260222140804.22225-1-rioo.tsukatsukii@gmail.com> References: <20260222140804.22225-1-rioo.tsukatsukii@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 This follow-up provides some tradeoffs between v1 and v2 - v1 used a fixed-size static buffer, requiring manual updates whenever new strings are added to taint_flags[]. - v2 uses a fixed-size static buffer only for initial boot. Once kmalloc is available, it allocates a dynamically sized buffer based on the total length of strings in taint_flags[]. - v1 needs an update every time taint_flags[] is updated. - v2 relies on the initial buffer as a fallback mechanism in case kmalloc fails. The initial buffer is currently large enough for all taint strings, but future updates to taint_flags[] may require adjustments. - v1 is more predictable, but requires more manual maintenance. - v2 is more convenient, but introduces subtle edge cases and potential allocation issues.