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[61.205.1.208]) by smtp.googlemail.com with ESMTPSA id ya10sm44431428pbc.69.2015.10.08.03.03.31 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 08 Oct 2015 03:03:36 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, rostedt@goodmis.org Cc: jungseoklee85@gmail.com, olof@lixom.net, broonie@kernel.org, david.griego@linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro Subject: [PATCH v3 4/7] arm64: ftrace: allow for tracing leaf functions Date: Thu, 8 Oct 2015 19:01:41 +0900 Message-Id: <1444298504-10392-5-git-send-email-takahiro.akashi@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1444298504-10392-1-git-send-email-takahiro.akashi@linaro.org> References: <1444298504-10392-1-git-send-email-takahiro.akashi@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: takahiro.akashi@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.181 as permitted sender) smtp.mailfrom=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , CONFIG_FRAME_POINTER is always enabled on arm64, adding -fno-omit-frame-pointer, while ftrace, CONFIG_FUNCTION_TRACER, adds -pg to KBUILD_CFLAGS. The combination of these options, however, does not implicitly enables -fno-omit-leaf-frame-pointer option, and no leaf functions are actually traced under ftrace. This patch allows for tracing leaf functions by adding -fno-omit-leaf-frame-pointer option, but does it only when CONFIG_STACK_TRACER is configured because it will increase the kernel size and add extra instructions on runtime. Signed-off-by: AKASHI Takahiro --- arch/arm64/Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index f9914d7..71cad91 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -28,6 +28,11 @@ endif KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) KBUILD_AFLAGS += $(lseinstr) +ifdef CONFIG_STACK_TRACER +ifdef CONFIG_FRAME_POINTER +KBUILD_CFLAGS += -mno-omit-leaf-frame-pointer +endif +endif ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) KBUILD_CPPFLAGS += -mbig-endian