From nobody Mon Feb 9 22:25:13 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 60E1CEE49A5 for ; Tue, 22 Aug 2023 21:31:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231332AbjHVVbF (ORCPT ); Tue, 22 Aug 2023 17:31:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43118 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231335AbjHVVbA (ORCPT ); Tue, 22 Aug 2023 17:31:00 -0400 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F34FE7A for ; Tue, 22 Aug 2023 14:30:55 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id d9443c01a7336-1bf6ea270b2so19519465ad.0 for ; Tue, 22 Aug 2023 14:30:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1692739855; x=1693344655; 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=sHNo52jMQHCTTXv1njx0att1y1oc+xWVwUeLIRRfBAg=; b=YC0PScEPND5aZfA24ZoaI8wC1TSlRy2EYibMqFd2iUs8w7ZRXT3RKFlha3o6KDnWYU nghvF99uhQidPrOCTS7kFbZPlAlehSol1ZWc0mEDaepO6A4obV5tBwUEQIFSbbZWPuUB UgSIx4tkrAH1Cw/lnH0Vt27I3n+AIHy+x0WXA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692739855; x=1693344655; 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=sHNo52jMQHCTTXv1njx0att1y1oc+xWVwUeLIRRfBAg=; b=WrMP+d5dv80pLf9qHd55a7QAJmTFCH4FScXA8C9wE0z8p6tm07btESKdxGMn+/ayEd wtTnbPbAbAfSKRrZmkA6DcqYYylwOhyAKjsO+5bzzrXbvbjWAMK/dZMuCpcdqcMIXtWX VTcE6F8R15lnCdSCdtVI8osMW/oHtGUEiLna6C8AUj7K8FjhiREmJwhFxSYA1+L5I4vy vVutfiMorpBLFJXY/q2iJFOvD41qkTSgzTKApTFf58X0AEaFCuywuc16cD1OI7bP61GS oFXy41dc1RANitDzNDZnUe+SX0tDdnF3qUQM26BRXNNitpI/LHnQBKYOqlU84hQqZkFA 4P+A== X-Gm-Message-State: AOJu0YxqN3LQAZOpyWuvo1SuyiSlNtiKgCS6DE+ULtDLGOh4A7G2CCFS E617fjmfij9SeTnbuzBzZCYPXw== X-Google-Smtp-Source: AGHT+IHswwKksNgSxyqElMvXEh66yr67LTxIGthRXPjy6R7WvznnHL9O4TkqksLBbcEBtlvUxYpXTg== X-Received: by 2002:a17:902:e842:b0:1b8:63c6:84ab with SMTP id t2-20020a170902e84200b001b863c684abmr9273364plg.61.1692739854952; Tue, 22 Aug 2023 14:30:54 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:83f0:2bc5:38c4:a9de]) by smtp.gmail.com with ESMTPSA id t7-20020a170902e84700b001befac3b3cbsm9451475plg.290.2023.08.22.14.30.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Aug 2023 14:30:54 -0700 (PDT) From: Douglas Anderson To: Mark Rutland , Catalin Marinas , Will Deacon , Sumit Garg , Daniel Thompson , Marc Zyngier Cc: Lecopzer Chen , linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, Peter Zijlstra , kgdb-bugreport@lists.sourceforge.net, ito-yuichi@fujitsu.com, Stephen Boyd , Thomas Gleixner , Chen-Yu Tsai , Ard Biesheuvel , "Rafael J . Wysocki" , Masayoshi Mizuma , Douglas Anderson , D Scott Phillips , Ingo Molnar , Josh Poimboeuf , Valentin Schneider , linux-kernel@vger.kernel.org Subject: [PATCH v10 5/6] arm64: smp: IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI Date: Tue, 22 Aug 2023 14:27:00 -0700 Message-ID: <20230822142644.v10.5.Ifadbfd45b22c52edcb499034dd4783d096343260@changeid> X-Mailer: git-send-email 2.42.0.rc1.204.g551eb34607-goog In-Reply-To: <20230822212927.249645-1-dianders@chromium.org> References: <20230822212927.249645-1-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 Signed-off-by: Douglas Anderson Reviewed-by: Stephen Boyd --- I don't actually have any good way to test/validate this patch. It's added to the series at Mark's request. 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 15b66dc1391b..c51d54019f5f 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.rc1.204.g551eb34607-goog