From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lf1-f51.google.com (mail-lf1-f51.google.com [209.85.167.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6917631F9A4 for ; Sun, 17 May 2026 21:40:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779054012; cv=none; b=G7LBKX+axafuad9UbBgdE17lij104TW9If0JRO4bt8cdCRLWRhg2A9sOefwogQ2GbKsFVXh/ttcskbrdgyUYRS9GYxnuHXBiKVVuQfaE+QRz3OqNkfjLxTUdRR+iZYumyB7tF4TTq93DVS0sEstufhNPPxOiJnAU1zxyIw5M3YA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779054012; c=relaxed/simple; bh=D04sp6jy24qV/d7jpV7qcj/FJRHhYaGlTiewOrERXrk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PlvgdEnJdp5YdwssIgao5A8cjlQmyiMsdSMDqA4H4OuDRfE6U0L9qaDW04hg7t3+xOt3g1wvwEdEoL+c4ZVUSI+tEMm5eF5JvNNwzZxblRRfcWXl7kHTU3Vdff0QLwv4J/d6WYt69ZPxUuME90axExY8e5XJCVTIM3YmGxIT2rw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Glk3lP0n; arc=none smtp.client-ip=209.85.167.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Glk3lP0n" Received: by mail-lf1-f51.google.com with SMTP id 2adb3069b0e04-5a858881ad2so2187673e87.3 for ; Sun, 17 May 2026 14:40:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1779054005; x=1779658805; 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=byIacLsO8qy3Mf9mbTJig4sdcp2UMDCGsxpnJNNgpcs=; b=Glk3lP0nSxczV3/GAuqzg0dFgynKlS8jF8HlBx0n8ASyeR0LK0N7oGjrdBQqnNPADQ LogenKISw+Oa0HZPFcDPfDH7KSYsYCMp452+BdkQEBRYsN5jivzpGpfXCW7o9Wf0aE7U O14jp7dTaZWCN+xS5pQRkoYmfUyQO6sU/98VK8mpYneVOk3IZnmxW8kaeKNHa0D9Rz39 PkpmaymAU7uGmr2xxEjwjmNw5P3M8wicSX8f25EuuXCfeXvVOumlOZxssilkJsApsquv tJtCcYgCZq4lxolIqKSF23MDAbbwl/Kp7FI6a1yc8NWSy4YAkNqi37GH9V39YHiO0Djv h0bQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779054005; x=1779658805; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=byIacLsO8qy3Mf9mbTJig4sdcp2UMDCGsxpnJNNgpcs=; b=sQ3pl0Q1Sa4NnU1giSbo5xDIu6LIcuS/ZS1lJ6YnWBSLwZqE1Di/7qASuCQwraXkcj RbELhO8pELog/bhG0Ol3LWQoTrmUBYDxCGi/gtN1B2S7tLzEVxl+i8GPE4MZh/g3zk2H KJyY/C7EloZ+i8ZIvbE2xXa0KThIiH2IAEnitGrw9MhlwAJTkPOi9YXVc7uLJa+OBrDa BfXnZLCG4/rV0h7Lv2C3OMMnory8+UAeb7ZNl3wNNJSAFG2kfHojJJFOA5laDsJBRTS5 yyd6pFeKZzjQHmceRWBOBTkdrv4oGxHScrbSzIqdh0Bh11WwsrJk9vVasolm13xyYXjZ EW7g== X-Forwarded-Encrypted: i=1; AFNElJ+hdhS0VOoRzkKuTWWcT8YbnzeIDnPP74oCE1iarNft4MPNTf1yu3anr9ccg1jyZVX7gsCGfyMDIrQsYA==@vger.kernel.org X-Gm-Message-State: AOJu0YxkF5VgfULeYrTB6EFn6F32UaWqrXA5zRxBIBj4npDrzXxfqcKg aSR1xFXNlt3FUd2uZfOJH9m5VtglNszGfe8qU1jC1OOysJXKoWEE4YXm/OFtTg0c X-Gm-Gg: Acq92OGJRLJvb4OO+wNj8FeoCEtTeWN67zEmmciFjlCWxEYa3kb8fAyeehKAgXpuJ9p MUQktBWsKf5b7Fn1FTh5JMcDgCF2S8l6EiQdbl+Vy1QXTLPU6v1qy8nvmLXiCvf49MRyZliQgpp FOUNCwm/f9CR9bKlOe10zHFIdLwj5YKbc/IvJYqEnTaA4ltp+Btc4kDia0Q56OIe2TFAO4tP9aH A4dYDnKnizv3W75rY3mlEB13A7MpOJyK8ch0Nj3L8LfqcMNlMSaQw2q0MmJLMZvDKUhCuT62tAo GoFP2yM7+sJw3YZnLm2eTlT6gTJqr111t0uyy98bFLicXMuJy+G7D0Iy2GmOuUP7Cp6GnmRgfxv T0BaSDz/pgepP+O509GwkEb3L4QgbrqgZTderu62tLGIMPlQlwP4uySaW+i+s3KHzer3m7gKKiE LW3zRpO4fZ+vPz2Dlmdz9VbTCbemnUMUv2mLgaiovQae4g3r8UdD2QN4zHBXrywPJ4Cc8fMuojy Ycp0FnkWo8Or7kFu3eWboMON+uWh8A2hHsSCsZ2ilCYDw== X-Received: by 2002:a05:6512:3a84:b0:5a8:88d5:a502 with SMTP id 2adb3069b0e04-5aa0e740342mr3142036e87.39.1779054005447; Sun, 17 May 2026 14:40:05 -0700 (PDT) Received: from buildhost.darklands.se (h-94-254-104-176.A469.priv.bahnhof.se. [94.254.104.176]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a91c1558f3sm2890076e87.77.2026.05.17.14.40.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 May 2026 14:40:04 -0700 (PDT) From: Magnus Lindholm To: richard.henderson@linaro.org, mattst88@gmail.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org Cc: glaubitz@physik.fu-berlin.de, mcree@orcon.net.nz, ink@unseen.parts, macro@orcam.me.uk, Magnus Lindholm Subject: [PATCH 5/8] alpha: provide ftrace return address support for lockdep Date: Sun, 17 May 2026 23:36:14 +0200 Message-ID: <20260517213919.347523-6-linmag7@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260517213919.347523-1-linmag7@gmail.com> References: <20260517213919.347523-1-linmag7@gmail.com> Precedence: bulk X-Mailing-List: linux-alpha@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Lockdep uses ftrace_return_address() to report useful call sites for lock acquisition and IRQ-state tracking diagnostics. Provide the Alpha architecture hook using the compiler return-address builtin when frame pointers are available. Return zero when frame pointers are disabled, matching the existing fallback behavior of architectures that cannot provide a reliable return address. This is a preparatory change for enabling lockdep support on Alpha. Signed-off-by: Magnus Lindholm --- arch/alpha/include/asm/ftrace.h | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/arch/alpha/include/asm/ftrace.h b/arch/alpha/include/asm/ftrace.h index 40a8c178f10d..7ec44134c804 100644 --- a/arch/alpha/include/asm/ftrace.h +++ b/arch/alpha/include/asm/ftrace.h @@ -1 +1,29 @@ -/* empty */ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_ALPHA_FTRACE_H +#define _ASM_ALPHA_FTRACE_H + +#ifdef CONFIG_FRAME_POINTER + +static void *alpha_ftrace_return_address0(void) + noinline notrace; +static void *alpha_ftrace_return_address0(void) +{ + return __builtin_return_address(0); +} + +#define ftrace_return_address0 alpha_ftrace_return_address0() + +/* + * __builtin_return_address() requires a constant integer argument. + * Keep this as a macro so the value is seen at the callsite. + */ +#define ftrace_return_address(n) __builtin_return_address(n) + +#else /* !CONFIG_FRAME_POINTER */ + +#define ftrace_return_address0 0UL +#define ftrace_return_address(n) ((void)(n), 0UL) + +#endif /* CONFIG_FRAME_POINTER */ + +#endif /* _ASM_ALPHA_FTRACE_H */ -- 2.53.0