From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 77DB52C6B3 for ; Tue, 2 Apr 2024 07:18:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712042307; cv=none; b=cxXJlxlxfouHPYwwv0d86AAroLccfPgyj7sT7/anDdLcnS43eLW+MZScH2ji6Kn9QHXscF3UtwEmGkRr9vHTkzKVSGOJZdLugerjJh3KluGjQklShHOkWbev0BOb+m4fcmKL5qaqrzPnm0XYuCCbQR/xQWyIbyf8OCAyEKCnR7E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712042307; c=relaxed/simple; bh=Z+zJUqfPOF+jbZ01WAERHLtrTeG63ePwxKaJCB3WiPo=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=VEDk2PfYeLqOC7LDIA/tXbT2JlZXRAQviZJyLE/SP1KurKvmJEzZRjO5IIIS9SLjfjcw3oIi8Bo7g5mcrYzTD2NYNJHb0zpD3j6MNl8CyyIvxikw2TJIqNa3FQBKkNhqMgRFFqofVb+zKX2zrFFAlBo9v/nbgf722ZuL9hx43HQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id AF319C433C7; Tue, 2 Apr 2024 07:18:25 +0000 (UTC) Message-ID: Date: Tue, 2 Apr 2024 17:18:23 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] m68k: Avoid CONFIG_COLDFIRE switch in uapi header Content-Language: en-US To: Thomas Huth , Arnd Bergmann , linux-m68k@lists.linux-m68k.org, Geert Uytterhoeven Cc: linux-kernel@vger.kernel.org, Oleg Nesterov References: <20240219160126.510498-1-thuth@redhat.com> <6f3b246e-7417-4455-abe4-ca3b42fdda4c@linux-m68k.org> <4824192b-5573-4246-a47c-ad6249e2900e@app.fastmail.com> From: Greg Ungerer In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Thomas, On 23/2/24 18:13, Thomas Huth wrote: > On 20/02/2024 16.09, Arnd Bergmann wrote: >> On Tue, Feb 20, 2024, at 15:13, Greg Ungerer wrote: >>> On 20/2/24 02:01, Thomas Huth wrote: >>>> We should not use any CONFIG switches in uapi headers since these >>>> only work during kernel compilation; they are not defined for >>>> userspace. Fix it by moving the struct pt_regs to the kernel-internal >>>> header instead - struct pt_regs does not seem to be required for >>>> the userspace headers on m68k at all. >>>> >>>> Suggested-by: Greg Ungerer >>>> Signed-off-by: Thomas Huth >>>> --- >>>>    v2: Move the struct instead of changing the #ifdef >>>> >>>>    See previous discussion here: >>>>    https://lore.kernel.org/lkml/6e3f2a2e-2430-4b4f-9ead-d9a4d5e42713@linux-m68k.org/ >>> >>> I am fine with this. FWIW the following architectures do >>> not define pt_regs in their uapi/ptrace.h header either: >>> arc, arm64, loongarch, nios2, openrisc, riscv, s390, xtensa >>> Though quite a few of them have a user_pt_regs instead. >>> >>> So for me: >>> >>> Acked-by: Greg Ungerer >>> >>> Geert, Arnd, do you have any thoughts on this? >> >> It clearly doesn't change the ABI, so that part is fine. >> >> If asm/ptrace.h is included by some userspace tool to >> get the definition, it might cause a compile-time error >> that needs a trivial source change. >> >> This could be needed for ptrace (gdb, strace) or signal >> handling and setjmp (libc), though it's more likely that these >> already have their own copies. > > If we still feel unsure, we should maybe rather go with v1: > >  https://lore.kernel.org/lkml/20231110103120.387517-1-thuth@redhat.com/ > > ? We have not had much movement on this. So... I am confidant that v2 is good, but lets err on the side of caution first up. I have applied v1 to the m68knommu git tree, for-next branch. Thanks Greg