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=2.5 required=3.0 tests=BAYES_20,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 206B3C433DB for ; Fri, 12 Feb 2021 11:18:06 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (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 90CC364DE0 for ; Fri, 12 Feb 2021 11:18:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90CC364DE0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies-bounces@kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94) (envelope-from ) id 1lAWSF-0007vd-JO; Fri, 12 Feb 2021 06:17:43 -0500 Received: from mail-il1-x12c.google.com ([2607:f8b0:4864:20::12c]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1lAWSC-0007vY-0I for kernelnewbies@kernelnewbies.org; Fri, 12 Feb 2021 06:17:40 -0500 Received: by mail-il1-x12c.google.com with SMTP id e7so7831478ile.7 for ; Fri, 12 Feb 2021 03:17:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:reply-to:from:date:message-id:subject:to; bh=yAo00DBwvKlE105a2/7CzdU3w1OyVYBHyyqABijyx7I=; b=QYpLbJT393Li5GDKRkK5AMx4ZLDrgFXnxp47Ao5cD9gXVoqV+4EqGvAF5dsiB3Y6ZP K1f1K2xSzSKaHhCUJM0F739UR5Qpg9q48h5g/yGRbwTTxdEUhYhHs8wokLHJVtlepRmK ZcRxe6vygQbIkyCdeIWSOrZbQBS7ts6s+ja6OHbwhOuMMJzSd9Di58V+6nW3AK799ONa l4O/6cxaaZrTbz1DtUfIoHhXBnz1v7v13bMJT1Mq44PUVL58US8rxpFJogdOPT9PXsg8 /O1E94RBm796bgOn3tsBL1xBF7/K5sFn9fuSP/JB/WPW2TASMo/4o0Rz+0hXOhQq6kth EhKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=yAo00DBwvKlE105a2/7CzdU3w1OyVYBHyyqABijyx7I=; b=aLIKOinmgdgehVrLk5fqekeepUPkELXpa3ppE+L05vkeomBAxvbVwX++p1DggH2N8g dGajBFzRHY5kRjvXmgeUilqwPLZ8ZPrwoQNBIlXdAER63XWi5fDpgNtsbRzwXHvx6Bdr BFrMB9NBtnHv5zhVMELzLA07E46cmidD9KqF8S5VdIgA3LjWgPiWGO96qcn3oCpWqtEg +A+PEZKdtVbrB/ep4iD72o4JPBpe3SwEYE7u7FMLPIt36IpqJsJ5HwslcVdIBJGtHr3p cuUgSw7Jaenakx/VpsmkNh3nj4UjHSXzP6ObAtW8pEPwF8+Wo1X7mhThhVYMTwJbEPzR dOhw== X-Gm-Message-State: AOAM533haTAYgWJR3+RG7yvJX/W1E/uLAaziH9XB9UnJQfW94TjqrTZ1 /8vDUjpzZ7nkWODcu9+mhliM9K6yYoUq587Da28n/Zykfrc= X-Google-Smtp-Source: ABdhPJymd0DOPnBF7+PVrzykDQmCeIHs8grl4kXmwWg8p7lbge9kRZN7wcnCXQjVz5U5le2d1w5OaIjx6S23Yy5KT+M= X-Received: by 2002:a92:db48:: with SMTP id w8mr2124220ilq.212.1613128658150; Fri, 12 Feb 2021 03:17:38 -0800 (PST) MIME-Version: 1.0 From: Jeffrey Walton Date: Fri, 12 Feb 2021 06:17:27 -0500 Message-ID: Subject: Is it possible to disable NEON to cause a trap with NEON code? To: kernelnewbies X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: noloader@gmail.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kernelnewbies-bounces@kernelnewbies.org Hi Everyone, I'm trying to setup a test case on ARM A-32. I want to ensure a NEON code path is properly guarded at runtime. I'd like to disable NEON at boot time so that a SIGILL is raised for NEON instructions. If I get a SIGILL, it tells me there's some NEON in non-guarded paths. Is it possible to disable NEON at boot time? Thanks in advance. Jeff _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies