From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=207.54.77.50 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793537532; b=4vQjJFRyIONAZrDBZqCn9XHm+ybOKOHY9pNALQ1G5PcL2KqCq99fDfXLSaFuzt1Yz+rC jDLsISMznFPB9+BjBOzNqwo5/9OY043m7MwD4N4sXBpOM66v9uNTrlrVRJ8P0794zAQAi /VjPrOEuII8RyvIxtlLxhJQuqxlzdkhIwhED0eeU6moh1MMw4eas9DrdIzrBr6WoFHLuV EL7P/BLzZzuYwdEql2xyrWWzurDzhczTgHY2VUlxsk2RNbDPQ5xNo2CBI1gTMY+qFAvnW ScxvTNk3GCFLzBYAIjpAtYkIyP8ncwXwQFSD3IR0W2Xa7fu94Lh1qkpRYYZS7UW5Q6w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793537532; h=DMARC-Filter:DKIM-Signature:X-CSE-ConnectionGUID:X-CSE-MsgGUID: X-Amp-Result:X-Amp-File-Uploaded:Received:X-CSE-ConnectionGUID: X-CSE-MsgGUID:Received:Received:From:Date:Subject:MIME-Version: Content-Type:Content-Transfer-Encoding:Message-Id:References: In-Reply-To:To:Cc:X-Mailer; bh=stI/el1CBpWwCJRTG5Yr04XGmaRKr84A3Tq3Gj7mwzQ=; b=gSgF+gCMNBaTp5RvgplOTXG15Lk0/ZmQNda8XClG3Nv83rX0HYiIcOXXC8TjoNGcziJs dOPFvzSqIGV1O9p4JonWFLPk/sbPi5B0Sa1jmnG8Jz37e8Bei4wJfOOmGOgqWltzU1ftY 42P5CTa47UoMd/i9oimp5PeFF6PfXKXW7AbFTIlXLlhDRYhCzYWCenDJ5uAqmLN80SYkc 8ApHswf7ltNnkzJZ684rntN9WBHYRESKjy4ge4izrc4b6VEMKeCEjPNbOqs8BLzBFJ25t WkijBQ5L1qJfOGahM1gnag1oa7xW5h893/dqRZvikDNwpsm4tlPV8DW0RB+E2fkWI1Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=mobileye.com; spf=pass smtp.mailfrom=mobileye.com; arc=none smtp.remote-ip=207.54.77.50 Received: from esa3.hc555-34.eu.iphmx.com (esa3.hc555-34.eu.iphmx.com [207.54.77.50]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 48845606A329 for ; Sun, 1 Nov 2026 12:52:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 48845606A329 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mobileye.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mobileye.com DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mobileye.com; i=@mobileye.com; q=dns/txt; s=MoEyIP; t=1793537530; x=1825073530; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=XcUFy86mcXwBkdVbQzI9DqvGN0xrj3EmlcdsiyF9xIA=; b=I1pkYVHhwMr5FDpLME7GGLsr46Kq5SzR89Cx7SRbABbNp8Z2S6MGQDR1 GJn+d+ylAgb9h9m/RBCov72tq3QT9h+kFA0c+lZugmpS1c2Ch/m06+4L7 Xcqab+APOdV7Dpt+tHBdY5oWLFtLN8bBZA13/5VUwb87QUzA5uHa70xXX dIl9aZ13SMjBrFpLgiFhYJgwLfnJ3EYQwtohdagJw0objuJ8NIJB5W5zS CUqejtlvL1HCN/CHx7uoySqRUuO2Nq2/eibrf89nBgAF3bfYNk8rwCmHg ndb9NjEyx83WcbpxMxLKwwxo61fNWDQYAt84FcvRCAVjcMxPrFvKiA4Ig w==; X-CSE-ConnectionGUID: cW9n8rYGRcCgTwgJg8msHQ== X-CSE-MsgGUID: QBEWlbg5QVqEzlJeM9FLAw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from unknown (HELO ces02_data.me-corp.lan) ([146.255.191.134]) by esa3.hc555-34.eu.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Nov 2026 14:52:00 +0200 X-CSE-ConnectionGUID: NRXJzW0zTWqgjUI9udJRrw== X-CSE-MsgGUID: CJJN556EQJmMSBLCCC7cOg== Received: from unknown (HELO epgd071.me-corp.lan) ([10.154.54.3]) by ces02_data.me-corp.lan with SMTP; 01 Nov 2026 14:59:53 +0200 Received: by epgd071.me-corp.lan (sSMTP sendmail emulation); Sun, 01 Nov 2026 14:51:59 +0200 From: Vladimir Kondratiev Date: Sun, 01 Nov 2026 14:51:40 +0200 Subject: [PATCH v4 2/2] riscv: accept the atomic extensions this kernel was built with 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-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261101-lrsc-only-v4-2-4e1d010463b3@mobileye.com> References: <20261101-lrsc-only-v4-0-4e1d010463b3@mobileye.com> In-Reply-To: <20261101-lrsc-only-v4-0-4e1d010463b3@mobileye.com> To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Will Deacon , Peter Zijlstra , Mark Rutland , Gary Guo , Yury Norov , Rasmus Villemoes , cfu@wavecomp.com, torvalds@linux-foundation.org, olof@lixom.net, aleksa.paunovic@htecgroup.com, arikalo@gmail.com, Boqun Feng , Boqun Feng Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Vladimir.Kondratiev@mobileye.com, Vladimir Kondratiev X-Mailer: b4 0.16.0 riscv_early_of_processor_hartid() rejects a hart unless its riscv,isa-extensions property contains "a". That rejects a Zalrsc-only hart even when the kernel was built to use only LR/SC. Require "a" or "zaamo" when the kernel emits AMO, and "a" or "zalrsc" when it emits LR/SC. A normal build defines both toolchain macros and still requires the full A extension. The legacy "riscv,isa" fallback keeps its rv{32,64}ima check. Signed-off-by: Vladimir Kondratiev --- arch/riscv/kernel/cpu.c | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c index 3dbc8cc557dd..5d1e39d16e59 100644 --- a/arch/riscv/kernel/cpu.c +++ b/arch/riscv/kernel/cpu.c @@ -82,12 +82,32 @@ int __init riscv_early_of_processor_hartid(struct device_node *node, unsigned lo return -ENODEV; if (of_property_match_string(node, "riscv,isa-extensions", "i") < 0 || - of_property_match_string(node, "riscv,isa-extensions", "m") < 0 || - of_property_match_string(node, "riscv,isa-extensions", "a") < 0) { - pr_warn("CPU with hartid=%lu does not support ima", *hart); + of_property_match_string(node, "riscv,isa-extensions", "m") < 0) { + pr_warn("CPU with hartid=%lu does not support im", *hart); return -ENODEV; } - +#if !defined(__riscv_atomic) && !defined(__riscv_zaamo) && !defined(__riscv_zalrsc) +#error "Need AMO or LR/SC atomics" +#endif + /* + * Require each atomic form this kernel emits. The single-letter + * "a" extension satisfies either check. A Zalrsc-only build defines + * __riscv_zalrsc and checks that extension only. + */ +#if defined(__riscv_atomic) || defined(__riscv_zaamo) + if (of_property_match_string(node, "riscv,isa-extensions", "a") < 0 && + of_property_match_string(node, "riscv,isa-extensions", "zaamo") < 0) { + pr_warn("CPU with hartid=%lu does not support AMO atomics", *hart); + return -ENODEV; + } +#endif +#if defined(__riscv_atomic) || defined(__riscv_zalrsc) + if (of_property_match_string(node, "riscv,isa-extensions", "a") < 0 && + of_property_match_string(node, "riscv,isa-extensions", "zalrsc") < 0) { + pr_warn("CPU with hartid=%lu does not support LR/SC atomics", *hart); + return -ENODEV; + } +#endif return 0; old_interface: -- 2.43.0