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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0EC1ECCD195 for ; Wed, 15 Oct 2025 21:01:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:Cc:To:From: Subject:Message-ID:References:Mime-Version:In-Reply-To:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=dl7DSFNXrvgC8fPiu6fPIF6OEEmMKscydyxcv7oyMcM=; b=NH8MK5zagP1AvXwu7vRfI0eMeq xBbHKOb6hq+ronxBzpWMvUqypH5fq8l0pBma0+0rJrp30lNqVemY6YWWkQ8o/6MXXbOsAbXfuur39 v3W4T6vdKbCXkDqdp11Hfvw1in/GM0KM2KE4mWeyFVXTfDt33BrQqIopFdt0IHVCByoTk1sUeLe0M DNr0AJycrhYE+87cKItZV9tF5MOUz7YDH6VI9ns+//4ojYi+zGCC7AW3pRCSbPdbOharlcaSRAJ6Y Lujn4Uwox3PfFK0MhlcBVyuzmpSQxbSY2UzEEQXEPZC1YwBh67qXkWYhbw5K/ZvxY+Cab1s/kz5Cx NAhoNASw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v98cY-00000002tke-47RR; Wed, 15 Oct 2025 21:01:19 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v98cX-00000002tif-1Eva for linux-arm-kernel@bombadil.infradead.org; Wed, 15 Oct 2025 21:01:17 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:Cc:To:From:Subject: Message-ID:References:Mime-Version:In-Reply-To:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=dl7DSFNXrvgC8fPiu6fPIF6OEEmMKscydyxcv7oyMcM=; b=hwM6LOfv+GJEYpsdvQPQRxBgl8 aXKatE7yIb+c/HiWb303jUjvTypKhOmSZ49OTBipM+LJKJ4xf0g6n3VlRzROzHD6Uo61mchUdhHEd wGuB0ybs+KINb6+HI2dM0IgKd6R6avEE3tXJAz1b4y1mMZ2QOxCovFFkF5cFlK4ypal0VfmZMlXuo izE6m0zEjHG8+4FCj/6qXg3uca9QPng+RNmW/Gcc2UT3Eh5NcBTQxbCPkJsoW3qp/jX6RMFNA2TCT Nl9fug8euKcWOM6peDLDCtrug8FcRF8LR57T469KTCOfsr+XjDIWre4FsXI6u2i1agxv2YWhaZN5l izXf8apw==; Received: from mail-ej1-x649.google.com ([2a00:1450:4864:20::649]) by desiato.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v98cQ-00000006G8Z-3Gpi for linux-arm-kernel@lists.infradead.org; Wed, 15 Oct 2025 21:01:14 +0000 Received: by mail-ej1-x649.google.com with SMTP id a640c23a62f3a-b5ffd44fcc0so1596866b.1 for ; Wed, 15 Oct 2025 14:01:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1760562065; x=1761166865; darn=lists.infradead.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=dl7DSFNXrvgC8fPiu6fPIF6OEEmMKscydyxcv7oyMcM=; b=q1bKxyhK/XpVgPgSFQ8uizaG3DoHJyY8/vpJ9tPAV6B1sBQXibsW6pSYCFwbQtksns nDpPoIl9wpBVt1oO9ppz2PO2Uo3wHMkOpYQ8bnSOl5RE2DxW4f7iLW4IN+qsV6v2Fttj auqXspbLKJFCz72dpK1FpWKo0qfwJRLccBTDSm1ZK1JOUAhZqLa5lxez8PBQ/8y9cM4X +fkmUbnccU6pcItoLC5UJ9MlROe6fbX2YqywDxPnBnQ7nHbYWSB4bwZb6jM2faEJf2tN DVSIGf6jwDzH5yyinYW5hiy7jgKIQC3gSgF5EhhuNmW2L+tBkOzoA/MotNghhqSFEYU0 6vjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760562065; x=1761166865; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=dl7DSFNXrvgC8fPiu6fPIF6OEEmMKscydyxcv7oyMcM=; b=I0nPM2BHAdO6o2ZrXcYyoR9Zu1JqFxtHJOjN/oILYSCsAUmNpWEurF6Yzn80in60rB buDjYDXy6dOlL5or1JYtYCzN6uVQObBt2JmqI7hAICHi6Oe0jWU92fzuvzxH8UirwuCT 1cAkfyIBzak1+6x7sGdbMa6nHfoFdYRd4i5sPy99EpD9aT8DlrLhLd4aoPLATVVj+WLr KQl0mNVKTzGyYIPGN5fhzHBRXCbLOf3+yNn6Tw4itWYagj6fBkvI/8qk24p+hCRI9pu4 gzPO5/hCqkMesRt43IU7QMMDxHnHajtEwFK3mAUon3oUhk8g3PG2YfS7466kIHWHGJu1 L63w== X-Forwarded-Encrypted: i=1; AJvYcCU81Rd+bcYwSCYn0bIltTMWFQ4cVSYr4L+bj41dKDlwPx17d+gB9Rs5bkdKeBoSPMu5m4hFfeCRCz/lXLKEhosd@lists.infradead.org X-Gm-Message-State: AOJu0Yw7JlwFuBn1b05FlrbvaTJGuJGcOUTMw7vcSfcPLXNWz8U2fWiW RI99RszlQFsYZoXpPe+xJwdoeA9iSIPB9KWfYPgN7iAt6Czf6vhCkZFUzyYdKIKslJ/MqxXuSw= = X-Google-Smtp-Source: AGHT+IFbnpDjbsGYz+B5RZXbbX+lQAERWey19YRdHXPDBHHjm8WsWQOtc3beJ3/VDPI6WGbFnSNWq6W+ X-Received: from ejkf21.prod.google.com ([2002:a17:906:60d5:b0:b3e:d65b:d781]) (user=ardb job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:980f:b0:b42:9840:eac5 with SMTP id a640c23a62f3a-b50acb0e645mr3264235166b.61.1760562064831; Wed, 15 Oct 2025 14:01:04 -0700 (PDT) Date: Wed, 15 Oct 2025 22:56:38 +0200 In-Reply-To: <20251015205634.3820870-9-ardb+git@google.com> Mime-Version: 1.0 References: <20251015205634.3820870-9-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=901; i=ardb@kernel.org; h=from:subject; bh=3k3eAeRzb5JtIy3mWW+ubq7svhGC8mUZQWnX3o9AW0Q=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIeMDV/tegTVS5dfXu18UWPjk1eM+1663m/bMeRC4e7bqM +23r1njOkpZGMS4GGTFFFkEZv99t/P0RKla51myMHNYmUCGMHBxCsBEmOwZ/oqnmq6ITeacf2jG mnnzLl0RqJGM0Df8/FlHNOxjasSsf5MZ/qc/KH/84UNLpdyBY1qtf2/cjU7fssu6aWcD8x4784P vOjkB X-Mailer: git-send-email 2.51.0.869.ge66316f041-goog Message-ID: <20251015205634.3820870-12-ardb+git@google.com> Subject: [PATCH v4 resend 3/7] arm64/fpsimd: Don't warn when EFI execution context is preemptible From: Ard Biesheuvel To: linux-efi@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ard Biesheuvel , Will Deacon , Mark Rutland , Sebastian Andrzej Siewior , Peter Zijlstra , Catalin Marinas , Mark Brown , Pierre Gondois , Sami Mujawar Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251015_220112_880183_478DC17B X-CRM114-Status: GOOD ( 13.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ard Biesheuvel Kernel mode FP/SIMD no longer requires preemption to be disabled, so only warn on uses of FP/SIMD from preemptible context if the fallback path is taken for cases where kernel mode NEON would not be allowed otherwise. Signed-off-by: Ard Biesheuvel --- arch/arm64/kernel/fpsimd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index e3f8f51748bc..3d848c89604e 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -1934,11 +1934,11 @@ void __efi_fpsimd_begin(void) if (!system_supports_fpsimd()) return; - WARN_ON(preemptible()); - if (may_use_simd()) { kernel_neon_begin(); } else { + WARN_ON(preemptible()); + /* * If !efi_sve_state, SVE can't be in use yet and doesn't need * preserving: -- 2.51.0.869.ge66316f041-goog