From nobody Wed Dec 17 04:42:16 2025 Received: from mail-ed1-f74.google.com (mail-ed1-f74.google.com [209.85.208.74]) (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 044461FC115 for ; Thu, 6 Feb 2025 18:18:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738865920; cv=none; b=a4ZNm0FO0bz9X7qGvxnjWiNDQNcYK20pbCVFm/aWzLwNq9QpwnMrBwTey2hr25bJwSuykLdubU3+GJUzDPKD4eWSXYFEp5uZqU0DYW7bpBU2b3OLwk5PRak3DsNWnu4bkyMBp2A+ETYsXfP0RMkA7f/mrUJUTuu1GcbOpPgEPjk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738865920; c=relaxed/simple; bh=5EVSb50dMQhWyPFGHfjsGLdP+2gDBxuAj9DD3qD/9wA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=L4ki7xS9tWxSoBh2hNmGL4iQehx/q1CQZ1N3VYs8L+n2rQzpquR5Af6VYefoPp4rqjGYnoKZ/Cdf4oluu25r5d4bI6WjVYiLbJP2efPSynpKKqXcWc4o3py1moTaTyEzIiD52iLhbKrlUmW71G2F1thLuQgKhxcTI0U4o+SCKPM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--elver.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=hWm2xkLr; arc=none smtp.client-ip=209.85.208.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--elver.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="hWm2xkLr" Received: by mail-ed1-f74.google.com with SMTP id 4fb4d7f45d1cf-5dcee17a6a5so1238412a12.2 for ; Thu, 06 Feb 2025 10:18:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1738865916; x=1739470716; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=Gbrljv8lkIJmai+iapf5Yd4+selXZvjO0vfpPpqYqbM=; b=hWm2xkLr0AuomA1CuAzFdTGmmJFf6o3LwE2jzSXCGikNBsZdkXJn/huy/JlLPrZJME lMTLbSq9zTlwjYK/ufoUkZfLEtiY7ya1WjWVfeLTGJVEYzPqNjo0wfa6rQA61eWwmVTd dZk3PGNFgT2pzarJnzMSGlfAX4WmYowIP/NHqa42UrKiEDJC2fmtORhuP22SZJvUFFS6 I5vyFQIzRnE2/LBBhdV21PhqmEahjmpFz6xnfVVxCqxSASESUjr4nio9WSpzNLerqlu9 CuvEk1622Pl/tonAdgy+4Drx9W6ihR6+wXFpMMuyg3pzeBiFx8XX9S9OIRyjOYMGEE/i awTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1738865916; x=1739470716; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Gbrljv8lkIJmai+iapf5Yd4+selXZvjO0vfpPpqYqbM=; b=OLBSjDM7cQpazPEsY7K6ZuAToLu1P3mQblTYiC2Hvq5/AkgIEvPf3sY90d0lFSL8H1 395VGAUQCnAF7yTag08UDPDu5P68W4FJ3bUdcMAacsIUXcy5K53oUQj9m1riiREsfzD/ Us5CglvoIXJMtSnvO4T1sieTWBOrl1TTrFBpvbq/fQ+ieukjh6mXJcvu3CZtNL+6zd8I 5iHUbsmQgU//2XdUbztgc7bbTW+CwrLQ66q+MaN5xtguDNwY3KnBA7rsYjMUKhfq/u+5 BOSyfd5jUN7UFzvU2ExJQEtf/rDC0qJcbWn4+nlBGwNA2sHbPglrbMtnMgq+3Xpe227h Bgrw== X-Forwarded-Encrypted: i=1; AJvYcCUnl+Aj1dXzCD4TEz7Ojj6ccwA6kPfIA65FNYOp4Ua/xQEqRf4ginUcQQi/yaNmMtr2d1O+3gPlptsxlh0=@vger.kernel.org X-Gm-Message-State: AOJu0YxICvHjOJGwglRtVqQCsnt5BljEcAp9j+MDcofz5dJxE0tQoUJI PCOowxIma7sdztbSSgrJUqEBxtd86LR37tWbOUrnFX2Xpjl7ye9RSJEePDkYrayv+76nRkBJiw= = X-Google-Smtp-Source: AGHT+IG6fYjyQDhG15FL/7jfcoC1TInNHtYu+hLdicEFGjYbLL+jlfGEcskN2tLnzzmKsflIazl4pQ1juA== X-Received: from ejcvq6.prod.google.com ([2002:a17:907:a4c6:b0:aa6:bd80:4523]) (user=elver job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:6d1e:b0:ab2:f8e9:723c with SMTP id a640c23a62f3a-ab75e210266mr866257866b.5.1738865916587; Thu, 06 Feb 2025 10:18:36 -0800 (PST) Date: Thu, 6 Feb 2025 19:10:14 +0100 In-Reply-To: <20250206181711.1902989-1-elver@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250206181711.1902989-1-elver@google.com> X-Mailer: git-send-email 2.48.1.502.g6dc24dfdaf-goog Message-ID: <20250206181711.1902989-21-elver@google.com> Subject: [PATCH RFC 20/24] debugfs: Make debugfs_cancellation a capability struct From: Marco Elver To: elver@google.com Cc: "Paul E. McKenney" , Alexander Potapenko , Bart Van Assche , Bill Wendling , Boqun Feng , Dmitry Vyukov , Frederic Weisbecker , Greg Kroah-Hartman , Ingo Molnar , Jann Horn , Joel Fernandes , Jonathan Corbet , Josh Triplett , Justin Stitt , Kees Cook , Mark Rutland , Mathieu Desnoyers , Miguel Ojeda , Nathan Chancellor , Neeraj Upadhyay , Nick Desaulniers , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Uladzislau Rezki , Waiman Long , Will Deacon , kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, rcu@vger.kernel.org, linux-crypto@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When compiling include/linux/debugfs.h with CAPABILITY_ANALYSIS enabled, we can see this error: ./include/linux/debugfs.h:239:17: error: use of undeclared identifier 'canc= ellation' 239 | void __acquires(cancellation) Move the __acquires(..) attribute after the declaration, so that the compiler can see the cancellation function argument, as well as making struct debugfs_cancellation a real capability to benefit from Clang's capability analysis. Signed-off-by: Marco Elver --- include/linux/debugfs.h | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h index fa2568b4380d..c6a429381887 100644 --- a/include/linux/debugfs.h +++ b/include/linux/debugfs.h @@ -240,18 +240,16 @@ ssize_t debugfs_read_file_str(struct file *file, char= __user *user_buf, * @cancel: callback to call * @cancel_data: extra data for the callback to call */ -struct debugfs_cancellation { +struct_with_capability(debugfs_cancellation) { struct list_head list; void (*cancel)(struct dentry *, void *); void *cancel_data; }; =20 -void __acquires(cancellation) -debugfs_enter_cancellation(struct file *file, - struct debugfs_cancellation *cancellation); -void __releases(cancellation) -debugfs_leave_cancellation(struct file *file, - struct debugfs_cancellation *cancellation); +void debugfs_enter_cancellation(struct file *file, + struct debugfs_cancellation *cancellation) __acquires(cancellation); +void debugfs_leave_cancellation(struct file *file, + struct debugfs_cancellation *cancellation) __releases(cancellation); =20 #else =20 --=20 2.48.1.502.g6dc24dfdaf-goog