From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E771C4363A for ; Wed, 28 Oct 2020 12:15:51 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 75922246F7 for ; Wed, 28 Oct 2020 12:15:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="DepoiNIv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 75922246F7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=vKkQg2veNbe7lK42lZ9p3POD43qrgO7XvQb+nGGKR4g=; b=DepoiNIvz2u9wHlD7I+NUtLA7 EymT+uSro4sRFyme334u1JVqSzWGC44nnQfreUZ5ezswpuc04+ADgnCMB/Dx2Rtf6cwUR/Ihj36kA Fq0loMb/L4ILviJmL1kVZBsixT6CPovwQFnz3P6XKUDCA5SXZEBHmTgmU0tlbtaxe6BG+E5Ipr82i 5rmnrGc0RCCTlpdzQlmna/qlh8chpw/5Ny81PunROHIB5NPSa3FBt3GQuHZy1r1r85BsuOwBFod04 Nxh/FqLrCV4qN1Y8/oX0FyhlFT97nAV2mOk6mP9psKJ4LldRKqybzRFw/8FWqupZB+1FMd33R/2C+ kEsHFOluA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kXkMG-0006i2-Jy; Wed, 28 Oct 2020 12:15:16 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kXkMC-0006h5-Kh for linux-arm-kernel@lists.infradead.org; Wed, 28 Oct 2020 12:15:14 +0000 Received: from gaia (unknown [95.145.162.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DDEF4246F2; Wed, 28 Oct 2020 12:15:09 +0000 (UTC) Date: Wed, 28 Oct 2020 12:15:07 +0000 From: Catalin Marinas To: Will Deacon Subject: Re: [PATCH 5/6] arm64: Advertise CPUs capable of running 32-bit applcations in sysfs Message-ID: <20201028121506.GG13345@gaia> References: <20201027215118.27003-1-will@kernel.org> <20201027215118.27003-6-will@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201027215118.27003-6-will@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201028_081512_791431_25E776EA X-CRM114-Status: GOOD ( 16.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, kernel-team@android.com, Peter Zijlstra , Marc Zyngier , Qais Yousef , Greg Kroah-Hartman , Suren Baghdasaryan , Morten Rasmussen , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Oct 27, 2020 at 09:51:17PM +0000, Will Deacon wrote: > diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu > index b555df825447..19893fb8e870 100644 > --- a/Documentation/ABI/testing/sysfs-devices-system-cpu > +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu > @@ -472,6 +472,14 @@ Description: AArch64 CPU registers > 'identification' directory exposes the CPU ID registers for > identifying model and revision of the CPU. > > +What: /sys/devices/system/cpu/aarch32_el0 Nitpick: should we call this aarch32_el0_present? It's not exactly present as we populate it as CPUs come online but it's closer to this mask than to the online one. > +Date: October 2020 > +Contact: Linux ARM Kernel Mailing list > +Description: Identifies the subset of CPUs in the system that can execute > + AArch32 (32-bit ARM) applications. If absent, then all or none > + of the CPUs can execute AArch32 applications and execve() will > + behave accordingly. What does "accordingly" mean? Normally, we'd get ENOEXEC but here the execve() "succeeds" followed by a SIGKILL if it ends up on the wrong CPU. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel