From nobody Mon Feb 9 17:38:08 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3297C6FA8F for ; Wed, 30 Aug 2023 20:32:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239756AbjH3Uc3 (ORCPT ); Wed, 30 Aug 2023 16:32:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239750AbjH3UcR (ORCPT ); Wed, 30 Aug 2023 16:32:17 -0400 Received: from mail-qk1-x734.google.com (mail-qk1-x734.google.com [IPv6:2607:f8b0:4864:20::734]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B99931244E for ; Wed, 30 Aug 2023 12:29:20 -0700 (PDT) Received: by mail-qk1-x734.google.com with SMTP id af79cd13be357-76f08e302a1so2714985a.1 for ; Wed, 30 Aug 2023 12:29:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1693423652; x=1694028452; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=qbk9s2ed2Gi+5NJ1qOCnDItkdATQhrhodWS8k0Aq0HQ=; b=iIX5nG3KwLD/GBDPVSR2ksfgcfG6ICIjvfStqHNBY34JwL3Mb5n84CB1FvlDDpL/6q YEI/x87H+7E9O9Ve5E6sQXzjG13nJqpp1vvcqECvXEup33ExdZcRdwHZxzxFwm/MR7kz GyjGkNMZPvLIHEtaBTjgZxXBgKx3SUOlrhDtc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693423652; x=1694028452; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=qbk9s2ed2Gi+5NJ1qOCnDItkdATQhrhodWS8k0Aq0HQ=; b=S8ccsaVLQYd/ZH0NEqI0vC0VpkCAjQ2Bv5m/rezkOkRfSlp6tIJcnZsV1GctOs1qez H/MPykIHdKc5yDSI8FtURy/EWCBQFaV6iA/hRGd5MX5RYitvOZM5+WEG/D9c1N+k4oCD sLnd4BhvT20+c4aBN14YJZUi9KxyGMT2P4WXshuuN6n+z0zB/5NnFy6z/zIETGwBgyn9 Y9xEDhO7Zx8Gyq2v+FeH+DpLxXmSxMCF4n6KsYMGYcmeBKAPtzBSMCXUOkmXvZXhJtyx geMhWxsgmDGW5XfTGF2+fm2KSgD/G+4vjvyEkT6WPl8YVzLJ+Wt9sjteDdqOKTBBjm97 9I9g== X-Gm-Message-State: AOJu0YyBK/yzU0LbsfvOBvYJdsgBRBBxUvgfu7s+4pquv8mtxQw7XVIJ lmeL85ETHnuVRBjo4vLQTMbK3XLxefzKjffJhzxGDYmX X-Google-Smtp-Source: AGHT+IHxDYoiWwRcFzk/j68VpzJh4FWcDcrG2boIQK6MYRCAWrovwACH3eHvWMJCrnBJyQGiUD8tUw== X-Received: by 2002:a05:6a20:7f9b:b0:14c:40d1:e911 with SMTP id d27-20020a056a207f9b00b0014c40d1e911mr3916569pzj.42.1693422827426; Wed, 30 Aug 2023 12:13:47 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:e315:dec6:467c:83c5]) by smtp.gmail.com with ESMTPSA id c15-20020a170902d48f00b001bbdf32f011sm11338928plg.269.2023.08.30.12.13.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Aug 2023 12:13:46 -0700 (PDT) From: Douglas Anderson To: Mark Rutland , Catalin Marinas , Will Deacon , Sumit Garg , Daniel Thompson , Marc Zyngier Cc: linux-arm-kernel@lists.infradead.org, Masayoshi Mizuma , "Rafael J . Wysocki" , Chen-Yu Tsai , Lecopzer Chen , Tomohiro Misono , Stephane Eranian , kgdb-bugreport@lists.sourceforge.net, Peter Zijlstra , Thomas Gleixner , Stephen Boyd , ito-yuichi@fujitsu.com, linux-perf-users@vger.kernel.org, Ard Biesheuvel , Douglas Anderson , D Scott Phillips , Josh Poimboeuf , Valentin Schneider , linux-kernel@vger.kernel.org Subject: [PATCH v12 5/7] arm64: smp: IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI Date: Wed, 30 Aug 2023 12:11:26 -0700 Message-ID: <20230830121115.v12.5.Ifadbfd45b22c52edcb499034dd4783d096343260@changeid> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog In-Reply-To: <20230830191314.1618136-1-dianders@chromium.org> References: <20230830191314.1618136-1-dianders@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" There's no reason why IPI_CPU_STOP and IPI_CPU_CRASH_STOP can't be handled as NMI. They are very simple and everything in them is NMI-safe. Mark them as things to use NMI for if NMI is available. Suggested-by: Mark Rutland Reviewed-by: Stephen Boyd Reviewed-by: Misono Tomohiro Reviewed-by: Sumit Garg Signed-off-by: Douglas Anderson Acked-by: Mark Rutland Tested-by: Mark Rutland --- I don't actually have any good way to test/validate this patch. It's added to the series at Mark's request. (no changes since v10) Changes in v10: - ("IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI") new for v10. arch/arm64/kernel/smp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 28c904ca499a..800c59cf9b64 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -946,6 +946,8 @@ static bool ipi_should_be_nmi(enum ipi_msg_type ipi) return false; =20 switch (ipi) { + case IPI_CPU_STOP: + case IPI_CPU_CRASH_STOP: case IPI_CPU_BACKTRACE: return true; default: --=20 2.42.0.283.g2d96d420d3-goog