From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-181.mta1.migadu.com (out-181.mta1.migadu.com [95.215.58.181]) (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 8FEE71F4C8C for ; Fri, 16 Jan 2026 13:18:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.181 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768569508; cv=none; b=kKpo/4MCTmAPjLVmIEMF2w/P/FdUU6Gs2vThA4QtYsRzOzzhjDnIoVqtCOBjvWP01f/W1TlHdM6XtmG9qrd8/Moaj8RbfCqvXzyTjEelpCFUOGPbcGUEe4M4zam8NBxVyvi92PAey0AARBxRhEByGgBxcxTzP0oNcKGLNu0mpEM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768569508; c=relaxed/simple; bh=YtcNPobA9DJ0Az7UvXwu5mYUae7PKVVUNOFXszXWmMQ=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=HyeV2ITwIJdXl+oyDA1O8X06CHUx9GJUvOOZAl+fqfCu5VRqyGa76T+zAgNIAthK0Om4A0C8zdRCZdsHCBw1zH0cpj9nCXjKoc6zt70oW5uBM7Vpc5WaT+goTG6Eo5U8drZOeOZGk4gEFzGRzMiwrICbyRcySL7CIqJlrTM8HAc= 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=XA99CCCB; arc=none smtp.client-ip=95.215.58.181 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="XA99CCCB" 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=1768569503; 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=MuoGIQ9vIMQ/xzxb40qwscCJBCe1iBYCKz/O7bcCJdc=; b=XA99CCCBeddQiGOk0XeYf6qliKMRpKKiO1eIdD4EPsMJbADULBepq0kC+8ke/UForeV/1y khig5DyXJZLqbAr5SKdxwcoNXuED6fkLZvIbYYl1euo3Setx9NeLs9zdGrT7Xqq/oIZrfi flW8SAZnHNWOt/IeVlthWG6yNpY6SBM= From: Fushuai Wang To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, dave.hansen@linux.intel.com, luto@kernel.org, tglx@kernel.org, bp@alien8.de, hpa@zytor.com Cc: linux-kernel@vger.kernel.org, x86@kernel.org, wangfushuai@baidu.com, aliceryhl@google.com, ynorov@nvidia.com Subject: [PATCH 0/2] Convert copy_from_user() + kstrtouint() to kstrtouint_from_user() Date: Fri, 16 Jan 2026 21:17:49 +0800 Message-Id: <20260116131751.45768-1-fushuai.wang@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Fushuai Wang Hi, There are several places use copy_from_user() to copy a string from userspase, followed by kstrtoXXX() to convert it to a desired type. This approach requires manually handling NUL-termination and proper buffer sizing, which is error-prone and unnecessarily complex. The kernel provides kstrtoXXX_from_user() helpers to copy a string from userspace and perform the conversion in one step. So use a kstrtoXXX_from_user() instead of copy_from_user() + kstrtoXXX(). Recent discussion: https://lore.kernel.org/all/20260112073039.1185-1-fushuai.wang@linux.dev/T/ Fushuai Wang (2): sched/debug: Convert copy_from_user() + kstrtouint() to kstrtouint_from_user() x86/tlb: Convert copy_from_user() + kstrtouint() to kstrtouint_from_user() arch/x86/mm/tlb.c | 13 ++++--------- kernel/sched/debug.c | 14 ++++---------- 2 files changed, 8 insertions(+), 19 deletions(-) -- 2.36.1