Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D823AC433FE for ; Wed, 8 Dec 2021 08:33:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244809AbhLHIhD (ORCPT ); Wed, 8 Dec 2021 03:37:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240441AbhLHIhB (ORCPT ); Wed, 8 Dec 2021 03:37:01 -0500 Received: from mail-ed1-x52d.google.com (mail-ed1-x52d.google.com [IPv6:2a00:1450:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E580C061574 for ; Wed, 8 Dec 2021 00:33:29 -0800 (PST) Received: by mail-ed1-x52d.google.com with SMTP id o20so5694262eds.10 for ; Wed, 08 Dec 2021 00:33:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=HhbhdM+UVkV69ylyGAUrfry6xL5WJfe10RQ3MgDri3E=; b=eaX02OEPSS+RjOClG9DGc+v6cgQ88a34E72u12SEvVTKae7LfSyBfOb82cG4ik+ihQ vMC/UinqwVByxQYNyaTphU4u1cPFoa3FXqjaXb9X9cmergltDcgJY6geO6dTNjMs/2Cr 2ckYlk3wDqtGK3dMjrahko4FFZAV2ZLENLDoRtZJulXk1fVkjlKnE9ISE0Zkh/Lv5x6d 3WHnHmdLbdozO2mDzEn3AK9XR42fFN9yqUlC6TVJAjiG2+oVvxbL3wlzbFnUlZMr9iVU YwDGI5KC09SF8tOHXYvP5dtqvieq6x4p02D04zO16Lh/5pIAR3UtwpUgEBbKD8H37KIh 9+ZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=HhbhdM+UVkV69ylyGAUrfry6xL5WJfe10RQ3MgDri3E=; b=rYwkdO0aHWDlTB0l5dCD5h81DifVQHqjx3H/xeZ8SyWaQX80nLesXCiNmJ/Pp9NZbi esRVFDjb//twJAhPjv0D4tmiQORYjLRmWKZQPsHTft1cjaBDEV3ZbuNHOz3zXjNJ/JkD KOg56rMnprhmZn5wxevdkNTkStymFAr+eTO2tCl99YaBQM5x95jWYsEZN8XgP1Y8P+r5 AWXXao96+9OeAPEsXKuyX5rJ25BtW+bmwW+foy8dN1nkeAk4YRxWSZUWPi/INfXLrCtW ruyHcJ42Ml+xaz1dMx4rTUkdcGi10N0tXMSUVLRIFCaeltABNiCv8g01Wm0Wz9o2UbYv O1LA== X-Gm-Message-State: AOAM531LyPWKm0seMs0JflNUFD/p1U5HuAOV5mO5XvcF15hZkcDoti51 OVIAthtH/SWkmOFBjUSF5wySvg== X-Google-Smtp-Source: ABdhPJz/Aub/CN7cwflA5aTaNqCW0zeff09QK+an5jfSI+P/yEVmx3XrZ525aOOBfp2sz8qeApVlag== X-Received: by 2002:a17:906:40c4:: with SMTP id a4mr5430305ejk.185.1638952407946; Wed, 08 Dec 2021 00:33:27 -0800 (PST) Received: from localhost ([104.245.96.202]) by smtp.gmail.com with ESMTPSA id z22sm1716370edd.78.2021.12.08.00.33.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Dec 2021 00:33:27 -0800 (PST) From: Leo Yan To: "David S. Miller" , Jakub Kicinski , Leon Romanovsky , Mathieu Poirier , Suzuki K Poulose , Mike Leach , Alexander Shishkin , Jan Harkes , coda@cs.cmu.edu, Paul Moore , Eric Paris , Balbir Singh , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, codalist@coda.cs.cmu.edu, linux-audit@redhat.com Cc: Leo Yan Subject: [PATCH v2 1/7] pid: Introduce helper task_is_in_init_pid_ns() Date: Wed, 8 Dec 2021 16:33:14 +0800 Message-Id: <20211208083320.472503-2-leo.yan@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211208083320.472503-1-leo.yan@linaro.org> References: <20211208083320.472503-1-leo.yan@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently the kernel uses open code in multiple places to check if a task is in the root PID namespace with the kind of format: if (task_active_pid_ns(current) == &init_pid_ns) do_something(); This patch creates a new helper function, task_is_in_init_pid_ns(), it returns true if a passed task is in the root PID namespace, otherwise returns false. So it will be used to replace open codes. Suggested-by: Suzuki K Poulose Signed-off-by: Leo Yan --- include/linux/pid_namespace.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h index 7c7e627503d2..07481bb87d4e 100644 --- a/include/linux/pid_namespace.h +++ b/include/linux/pid_namespace.h @@ -86,4 +86,9 @@ extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); void pidhash_init(void); void pid_idr_init(void); +static inline bool task_is_in_init_pid_ns(struct task_struct *tsk) +{ + return task_active_pid_ns(tsk) == &init_pid_ns; +} + #endif /* _LINUX_PID_NS_H */ -- 2.25.1