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[94.254.104.176]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5aa5b0687e2sm310433e87.6.2026.05.29.07.23.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 May 2026 07:23:46 -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 v2 5/8] alpha: provide ftrace return address support for lockdep Date: Fri, 29 May 2026 16:22:01 +0200 Message-ID: <20260529142322.1362438-6-linmag7@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260529142322.1362438-1-linmag7@gmail.com> References: <20260529142322.1362438-1-linmag7@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@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