From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yx1-f49.google.com (mail-yx1-f49.google.com [74.125.224.49]) (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 3136732D0CE for ; Mon, 1 Dec 2025 15:24:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.224.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764602660; cv=none; b=uXBGttchwkTaqdn2Li206g1ymrewoB7lPOUzvbuDsE1TQ7jJB7wmIsazwfxSCII0VxkuME4KS8zrvYOrBj0hD+PRkWzWph/IwqKcqKYy6ojysjiovqEEvb8OEkbLuEtmOFl6s7pjlv8gqbPI29bqi1n8anputsNKqnskoMJdngM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764602660; c=relaxed/simple; bh=cY9bItRKV7MeQ3fzDvvUnE/5TDLFdE1LprSC6atyqEk=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=AIGgH+e2TuOdki2rJvsJ7gBy3XrdEpP+JB6mqkzdwSfg/8lbPYgQYb/9Pgtc6paSu188ScgK8tqNf/gSxSVkg6jaV2+pEGIsBGrH+UFIt/M+h9b59Zjk0OYrt2sYR4R1lkeWnorTqDTIptNaX8zx1xHmZeUsij7hxR1dI2GSsZ8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=chrisli.org; spf=pass smtp.mailfrom=chrisli.org; arc=none smtp.client-ip=74.125.224.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=chrisli.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chrisli.org Received: by mail-yx1-f49.google.com with SMTP id 956f58d0204a3-642fcb9c16aso3395431d50.1 for ; Mon, 01 Dec 2025 07:24:16 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764602656; x=1765207456; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=17bIyn0p3iDPeQSWq2I5zGPQQ5/UYUoRemVY1Guzd1M=; b=VeQJb8p2E/gr6s6R/rMkF/Eb888WVYFTg7A9LY1AHlVzjEUJg3m+MugZNBZ4jyS8eN 0cEugiOLsrvglpcvm2dEnLo1eI01JzT6Vy67wgHwFzB/3ljy9TKkgE+FQryq3GrritSb jtuOklWN52QqpoldS8tLE6JR21OAkJFfZDp88nR7zVu4YQCb6vjXBL3fUPedy2Klj06f Psi0yTpAyg3ZB5nPYGYSao5GxL1laK9H/KxvcsDQTBO6B7qaKXFRRHywQYFUy0+3wSMV qpIPM2uRCDwWjmpqaRBn8uR1gK8VnF+u6wIzk4Bc0XwPHw2bNl/UG+2aUCQqmoKQP9ks OhiQ== X-Forwarded-Encrypted: i=1; AJvYcCUTI5Jd+z4VXRcMyyjIhGAVZDesZuCyCKJkHL8eBe0bNOkU2v7q4SMz8GQSIk5Q0z1AoIp0+mFck/lbycs=@vger.kernel.org X-Gm-Message-State: AOJu0Yz+hqcNwkWHnOB0a9WB6oyBs/5IOhYrUx9r+hCeSHR4JwZyKZmV 2Dj/lLhx5NMP9KxuvOvuwf9p8OpStaldTFQLwBDHc8jjE1MPJSfaJUGhd/5ypBbqVfZ4pfl8tYf aM07Vg6snVESa/TNlu8QeUJKqGQaL/vYD5iABTO+d9A== X-Gm-Gg: ASbGncveR4yHAu5rbVg/+PiCqVLvG9wd5UJmHKGVc/uMG+3p6QLHbbbrRv5aRdknSX0 WVGb80oYntw694tzZlTOR5jVif+HhfsZVngQVCJjNLzQKh7vKiypvXcfmlOFl3wMCtvLKNeyAhe ySBTgeKxTeS9F0rW4TdSPGJp8sK4xt67IPQaGS7Vylks5iUa1Qi3PBpLtGmpniXaQwvc7LWNGTY xVxXX7ACnQIGKQ+C0hOwq9qQkB42wGErFDQA1YulPGB/wYbhOq+Q3kbcSZh5zVVsa+n8HAgcLRb 34v8b1uxF8ePr63oymw69mXcfmUs X-Google-Smtp-Source: AGHT+IGJcLi766kaUx/+ryPFGP3QH+q1D+JrCmgQ08c9S+BqT9ge41Lqw0U3q/l7V4SU1FDZ/JuSylL6qV6oz8oP9fE= X-Received: by 2002:a05:690c:6c0c:b0:78a:722f:a7c9 with SMTP id 00721157ae682-78ab6f496eemr390066037b3.47.1764602656191; Mon, 01 Dec 2025 07:24:16 -0800 (PST) Precedence: bulk X-Mailing-List: linux-sparse@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: In-Reply-To: From: Chris Li Date: Mon, 1 Dec 2025 19:24:05 +0400 X-Gm-Features: AWmQ_bkT-_LLy5FdXkvpOVpXotrcp1eIDyBWHd7QyWlqBol4jh5cOzAPRwA4pEg Message-ID: Subject: Re: [PATCH] validation: add check for typeof() and address spaces To: Dan Carpenter Cc: Uros Bizjak , Sparse Mailing-list Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Oct 28, 2025 at 5:32=E2=80=AFPM Dan Carpenter wrote: > > The typeof() key word should preserve the address space and > typeof_unqual() should not. Add a check to verify this works as > expected. > > Signed-off-by: Dan Carpenter Applied to sparse-dev. Chris > --- > validation/typeof-as.c | 32 ++++++++++++++++++++++++++++++++ > 1 file changed, 32 insertions(+) > create mode 100644 validation/typeof-as.c > > diff --git a/validation/typeof-as.c b/validation/typeof-as.c > new file mode 100644 > index 000000000000..563685281d92 > --- /dev/null > +++ b/validation/typeof-as.c > @@ -0,0 +1,32 @@ > +#define __seg_gs __attribute__((address_space(__seg_gs))) > +static int __seg_gs m; > + > +static int __seg_gs bad_manual (void) > +{ > + return (*(int *)&m); > +} > + > +static int __seg_gs good_manual (void) > +{ > + return (*(int __seg_gs *)&m); > +} > + > +static int bad_typeof (void) > +{ > + return (*(typeof_unqual(m) *)&m); > +} > + > +static int __seg_gs good_typeof (void) > +{ > + return (*(volatile typeof(m) *)&m); > +} > + > +/* > + * check-name: typeof address space > + * check-command: ./sparse typeof-as.c > + * > + * check-error-start > +typeof-as.c:6:19: warning: cast removes address space '__seg_gs' of expr= ession > +typeof-as.c:16:19: warning: cast removes address space '__seg_gs' of exp= ression > + * check-error-end > + */ > -- > 2.51.0 >