From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-188.mta1.migadu.com (out-188.mta1.migadu.com [95.215.58.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 924F633B6ED for ; Wed, 25 Mar 2026 18:40:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774464007; cv=none; b=lYGcIWeGCwCfU+Z91VfXBAESZhfVceQZ6by7HIOJxNf8j+rhLmh/JweMSxgDyAmu3G0G3oWy+XLqGfOEGURSxgb8epgKkOxb9WGnKL4Jri6mhFFzI46h+iCDABBXZHeRAyhEVApmcRZ0kGa4zUmYHqIS2n7p2x7K/HQW1bNbkpQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774464007; c=relaxed/simple; bh=48cu2et7c44Coh+w2eflFsLos3dZ0LkEmLZqJYXOmBM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=I6ADWVpydwzlrycLLix2CeulsAa+qcX73J8LAGsGPy7byDMjU+8JoWoXO15pD98tTk46Pluf+qZwsu24L4+TvbwSxrq0jv9VuQdG/IXNRbI1dhYp2artf79ZrifzcLksaK2kwJtVieHtbDbEfjN5wlUdqZ9SbvuI3hXw0g3dyCw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=glrrir0Q; arc=none smtp.client-ip=95.215.58.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="glrrir0Q" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1774463992; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=guUTuRkVZX4cpq0JsrYHGXP/ufz/bCOXkYefZ5151l8=; b=glrrir0QgwQxzJllY+8VTjjzWAN4zl5XMicvWA2En0SCRKGNk+7e2Ln1EdevIoaUenq986 u+xE3AtUp5egR5AD8zNj+RzRIsqdMvBa7E5DzmwnMGmX1oSj2I1ZMtQ7EEkbIpbr0qF5X4 yEIgfrpTik057bvOvYG9Md4FtyGe5zA= From: wen.yang@linux.dev To: Joel Granados , Kees Cook Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Wen Yang Subject: [RFC PATCH v5 0/2] sysctl: add CTLTBL_ENTRY_XXX() macros for ctl_table initialization Date: Thu, 26 Mar 2026 02:39:14 +0800 Message-Id: Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Wen Yang Historically, changes to how struct ctl_table entries are initialized (e.g. removing the child field, const-qualifying ctl_table) required touching hundreds of files across all subsystems. Such series require the attention of many maintainers, sometimes need to be pulled into mainline in a special way, and create lots of unnecessary churn. With CTLTBL_ENTRY_XXX(), future structural changes to struct ctl_table need only update the macro definitions. Conversion of existing call sites will proceed incrementally from kernel/sysctl.c outward, rather than as a treewide sweep. This series: 1. Introduces the CTLTBL_ENTRY_XXX() macros in include/linux/sysctl.h, using _Generic() for automatic proc_handler selection, auto address-of, auto maxlen via sizeof(), and compile-time validation. Supported types: int, unsigned int, long, unsigned long, bool, u8. 2. Converts kernel/sysctl-test.c as a demonstration, adding a parameterized KUnit test covering all macro variants (V, VM, VMR, VN, VNM, VNMH) across int, u8, bool, and char[] types. Based on discussion and suggestions from: [1] https://sysctl-dev-rtd.readthedocs.io/en/latest/notes/ctltable_entry_macro.html [2] https://lore.kernel.org/all/psot4oeauxi3yyj2w4ajm3tfgtcsvao4rhv5sgd5s6ymmjgojk@p3vrj3qluban/ --- Changes in v5: - Extend __CTL_AUTO_HANDLER to support bool and u8 - Replace individual test functions with a single parameterized KUnit test (KUNIT_CASE_PARAM) covering all variants and types - Use struct ctl_table as the expected-value container in the param struct, eliminating custom expected_* fields Changes in v4: - Fix Wpointer-type-mismatch warnings detected by lkp: https://lore.kernel.org/oe-kbuild-all/202603050724.SZxrEyyu-lkp@intel.com/ Changes in v3: - Replace the unique macro with "capital letter approach" - Reduce the name further https://lore.kernel.org/all/rn4rsazh7kxf5byq65vw2phyqgzvwm3scczu3l5h2r4aqit2r6@znlpb24z2zuo/ Changes in v2: - Add lvalue check, handler type check, etc. https://lore.kernel.org/all/xptwb3uwbzposd4xf7khj52ifv4tchcjdgllhv7aabi6d7wgef@2msurl564v53/ Wen Yang (2): sysctl: introduce CTLTBL_ENTRY_XXX() helper macros sysctl: convert kernel/sysctl-test.c to use CTLTBL_ENTRY_XXX() include/linux/sysctl.h | 307 +++++++++++++++++++++++++++++++++++++++++ kernel/sysctl-test.c | 237 ++++++++++++++++++------------- kernel/sysctl.c | 2 + 3 files changed, 447 insertions(+), 99 deletions(-) -- 2.25.1