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 BC15F193; Wed, 20 Nov 2024 00:05:36 +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=1732061136; cv=none; b=F7kX5P7NQAnkk/Nb8fs5/PVJzf1aHedSQE+gJRlNUf0HDXnbsaGXuk3HO01GcvQXWgZt6GAnkDle6ZDxh0rguadKNSs8Qryt+Ikp9cNmLbO/Ud8gTPp8pW3mGGHH7eMSc2yfMqUDWRK2BVcS9ZX6XwOwJD1iMFbX/i3C4jf0vfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732061136; c=relaxed/simple; bh=NMnFX7XK6VdRPzGtpSRTKyvI+/r1fqrGrX48X5BBDWA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=H3mjApGchXntPaTsiTun9YAMNpumBS37zjZbuy1gasVvNZcszphDac8Vce2dDoI5/6AoTrXWSwrcjfFt6XmC9QZtj2rXO7rrf6J6NBGMYd9S33A90Ma9C8QFMRaGGzP0wz0InFDoZzMm2+Whwp9ofP1fMertercYWT8znrmLmFQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eksPcppY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eksPcppY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 492F7C4CECF; Wed, 20 Nov 2024 00:05:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732061136; bh=NMnFX7XK6VdRPzGtpSRTKyvI+/r1fqrGrX48X5BBDWA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=eksPcppYzPeSt6INt9TwqRvZ4lhbHTxdkTT3HfOrf73uMrdgSEcCiaBLbjbuEr7KW KTtf0X/Xm113UupXPcdgtWqsbZTElfC3SS6AjmXWs7Njc7ceshzOwUlnMhh2jsa5hH 5OHCR/v0n3tWuWAQrg1DkVk8tW7PRGoTeRmRwkCdgz5FoLEnCrEjA+x4MkVxOrYs9g tX6BNjcLJDxuXETMH5s7gDSEqB5HHNJFSx81pxD01l1XlEm7xGdkg4yKrWRdZOitj5 tSMfXDjRII5KS06JqDQP80Djvc0pHpcI447DDFOp/8729SCiqKnXDMrLwR5jZhA/7C VKL7upp0zVLyg== Date: Tue, 19 Nov 2024 16:05:32 -0800 From: Josh Poimboeuf To: Valentin Schneider Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, x86@kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Andy Lutomirski , Peter Zijlstra , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Jason Baron , Kees Cook , Sami Tolvanen , Ard Biesheuvel , Nicholas Piggin , Juerg Haefliger , Nicolas Saenz Julienne , "Kirill A. Shutemov" , Nadav Amit , Dan Carpenter , Chuang Wang , Yang Jihong , Petr Mladek , "Jason A. Donenfeld" , Song Liu , Julian Pidancet , Tom Lendacky , Dionna Glaze , Thomas =?utf-8?Q?Wei=C3=9Fschuh?= , Juri Lelli , Marcelo Tosatti , Yair Podemsky , Daniel Wagner , Petr Tesarik Subject: Re: [RFC PATCH v3 06/15] jump_label: Add forceful jump label type Message-ID: <20241120000532.maqzgsn7m34lti6u@jpoimboe> References: <20241119153502.41361-1-vschneid@redhat.com> <20241119153502.41361-7-vschneid@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20241119153502.41361-7-vschneid@redhat.com> On Tue, Nov 19, 2024 at 04:34:53PM +0100, Valentin Schneider wrote: > +++ b/include/linux/jump_label.h > @@ -200,7 +200,8 @@ struct module; > #define JUMP_TYPE_FALSE 0UL > #define JUMP_TYPE_TRUE 1UL > #define JUMP_TYPE_LINKED 2UL > -#define JUMP_TYPE_MASK 3UL > +#define JUMP_TYPE_FORCEFUL 4UL > +#define JUMP_TYPE_MASK 7UL Hm, I don't think we can (ab)use this pointer bit on 32-bit arches, as the address could be 4 byte aligned? -- Josh