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 9EF7837BE8A for ; Thu, 7 May 2026 09:29:05 +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=1778146145; cv=none; b=U8pOne18RnKfAOafAt3LWgSAZyWnS541H0c1pyNSpV1NQ3n181oyWwZo93Er7/AF2nROdRU6wfrHqCgX4gtbGtAWzbbA4Pn3PObpweBH2aU+5TsMEPgQGnJcJMA8TTubqXnyjN65npkyO8fMJHHAnfn5w+b3K36IYE2KDdoTqdA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778146145; c=relaxed/simple; bh=Kh2f1ekOTfokzkbLTgrGfW8jOIKxwSDwXSfFrguc9us=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=pxsDZG81YUcFcFpp226I61ab+AAeoa+xrqWHK9Y1YxG9u/vnxz6nlw8dXk/Z/ippmruJ6KLyKetzQIFhPSHkBF6jyRCINahX8PvKSocl1yC2+uQZvldYEn6+XSpSXyPd8YrV38cLW34VmgQ2u/3/alW0o/DHfsN25Ho0c9UCXeU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nyMAVGRC; 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="nyMAVGRC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A49B3C2BCC7; Thu, 7 May 2026 09:29:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778146145; bh=Kh2f1ekOTfokzkbLTgrGfW8jOIKxwSDwXSfFrguc9us=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=nyMAVGRC5OhRL9jh2Xd4KEvPyjnWIr7nAjZKIF7NfDEUFVKOg0jPRl8UPJO1mwlxg XAwZs4Qm+DAfDoLMwQy8Mzj7vyhCFqTuL7SIm6h00NXpM/GD5JYq2rgOJdXzjc65bk VEPRqLXFGVba+o1nMJKu7y296zBQhbuGEAjWlnP3xHxeS2Gst8zDHz4Wx7L/B/5cBP WnLgAivOY0cFogFQkUol3sNbMvWtb+oGv2oawqTlJcyPYNQOZWn9J8v0JglNMAcDS+ WwYq3VCJB0RXKZsOcgaU2LSYymW/5e8gKHiRwGtsoCGRpv320gCThnLrH0Vdy8og38 QJ0OSzVldbHRg== From: Thomas Gleixner To: Thomas =?utf-8?Q?Wei=C3=9Fschuh?= Cc: LKML , Mathieu Desnoyers , =?utf-8?Q?Andr=C3=A8?= Almeida , Sebastian Andrzej Siewior , Carlos O'Donell , Peter Zijlstra , Florian Weimer , Rich Felker , Torvald Riegel , Darren Hart , Ingo Molnar , Davidlohr Bueso , Arnd Bergmann , "Liam R . Howlett" , Uros Bizjak Subject: Re: [patch V4 12/14] x86/vdso: Implement __vdso_futex_robust_try_unlock() In-Reply-To: References: <20260402151131.876492985@kernel.org> <20260402151940.418303527@kernel.org> Date: Thu, 07 May 2026 11:29:01 +0200 Message-ID: <878q9vwote.ffs@tglx> 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-Transfer-Encoding: quoted-printable On Wed, Apr 29 2026 at 10:44, Thomas Wei=C3=9Fschuh wrote: > On 2026-04-02 17:22:00+0200, Thomas Gleixner wrote: > (...) > >> + * When CONFIG_COMPAT is enabled then the 64-bit VDSO provides two func= tions. >> + * One for the regular 64-bit sized pending operation pointer and one f= or a >> + * 32-bit sized pointer to support gaming emulators. > > These gaming emulators can emulate 32-bit code on 64-bit kernels even > without CONFIG_COMPAT. At least this is how I understand Wine WoW64 and > FEX-Emu. And in that case the 32-bit sized pointer function should be > available unconditionally, without the dependency on CONFIG_COMPAT. That might well be, but that requires also the ability to register a 32-bit robust list for a 64-bit process, which is not supported right now. So no, we are not exposing something half functional just because. That needs to be mopped up once we add the multi-robust list stuff. Thanks, tglx