From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=192.198.163.8 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792490605; b=biH0HYgbHTRCe2bxa1Nw60niiIQ+BGctRydvQAprqa8eUaG5zRfDt4B4ril8hUL1p2gG X6AH9YOctmywDm3scTNi/Ewk9CeXQLdD4DboxdSBRWpw3kDyU1LmqFvR0xf50uyMMS7vN U4Dp6GAUnLFGWmza5RcRZlySY8YUu2liicCB103Ss/WZrX+RcZx4gH0OSCn8ZDRgKDU/H qjv5v+f1hw5cKYx5FDAAR3i3ivcIe5gyQSvHGepdxMUEImNA0AHssu5EXnpFbP2aOhoec Y03XMY800TqbImIXsjTvKP7GB8nOp3AUj8zl/aHeBif/Tl2+r2cqKiGZiSgHPRM7VZQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792490605; h=DMARC-Filter:DKIM-Signature:X-CSE-ConnectionGUID:X-CSE-MsgGUID: X-IronPort-AV:X-IronPort-AV:Received:X-CSE-ConnectionGUID: X-CSE-MsgGUID:X-ExtLoop1:X-IronPort-AV:Received:From:To:Cc:Subject: Date:Message-Id:X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=0uupRHpCPIAnfVVmmMtZVRVwnEHBLHGwl/qJmmSWTA0=; b=WlfC1L93b62EeKhgNQ0FSB4n/wo9o8ZhSK5/lhTNHNSIAgiXHCdclk/NndQW+ZRkz5S5 2nHV/l+DAye2KFexTPgSVBRb4Yn6XNBcTRuCRPvtveTcHcAEahYHL7HUQ7IgHOIFTuUJi IQzy6R2jMrphlHOm9ZeNNhqMAbqP+WgTsZR4T4ApGd0jT/kHXeGc0J7cJ3OVppLX2SmhD 1ayY9rVAyVGqlc/C/oN4MrCR8wPj6voxJaWsNle2JMSrP6DOUmluyMDZnZSa3cweJBrCr sfl2XEn1NCurGhsUpJBJA5UYqldLoSNEr6ykX8Zwg6Z0jYGJbz9kYGNHDfkbM1F6WwA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=hpaz8a+C; arc=none smtp.remote-ip=192.198.163.8 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8FE1606A31B for ; Tue, 20 Oct 2026 10:03:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org D8FE1606A31B Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=hpaz8a+C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1792490604; x=1824026604; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0uupRHpCPIAnfVVmmMtZVRVwnEHBLHGwl/qJmmSWTA0=; b=hpaz8a+CEgfrDaiS1/TPXnR/D2J2Ko0eUg51s9UMiHF7bWMkfZz2QOEc /HhzeYl65+F6LNiBW7/PCuNKXkZ3DVKqyq1IQV/G6rJ7BHXtKgA0bVqWb GxXE21zJVc4al9l2Y47b19mATd3XP9HaWuowgMUhZtzyiQ911H0WH2Yix zz8vc1v6DDvtPDgucAJGsHkMQ2qbBufPe9i0yPlfH8IVKUG8geeOvX130 YCTuo8cRiAtnDaPqS+DtlzyBfNZI17FNhBYjlyb+UCll9nRyl0Q6n9IiJ Z92K/Af4FSMmI7ja+btqR/hYTPskKYX8p1YswU8gviyz1VZ7aaZoj/zc9 Q==; X-CSE-ConnectionGUID: B1Muc/FTTyKlxBG7LbmHfA== X-CSE-MsgGUID: wOoyJz9eRSOECR+38MWhuw== X-IronPort-AV: E=McAfee;i="6800,10657,11940"; a="1082677" X-IronPort-AV: E=Sophos;i="6.27,168,1787036400"; d="scan'208";a="1082677" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Oct 2026 03:03:23 -0700 X-CSE-ConnectionGUID: 3l70Pp/sSLu4oxS8pxyXKA== X-CSE-MsgGUID: Fz6ZIbqwQSO/OvnglPRIwg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,168,1787036400"; d="scan'208";a="2890222" Received: from sdp-s2600wc.sh.intel.com ([10.112.229.16]) by fmviesa002.fm.intel.com with ESMTP; 20 Oct 2026 03:03:21 -0700 From: Guobin Zhang To: tchiu@tenstorrent.com Cc: alex@ghiti.fr, aou@eecs.berkeley.edu, guobin.zhang@intel.com, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, pjw@kernel.org Subject: Re: [PATCH] riscv: signal: protect regs->status RMW from concurrent preemption Date: Tue, 20 Oct 2026 18:03:20 +0800 Message-Id: <20261020100320.2107301-1-guobin.zhang@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Andy, Thanks for the review and the suggested approach. I'll send a v2 that disables preemption at the fstate_save()/fstate_restore() level and adds the fstate_{save,restore}_preempt_off() variants for the scheduler and kernel_mode_fpu. Thanks, Guobin