linux-kernel - Re: [PATCH] arm64: defconfig: Enable Ftrace and STM configs

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Message-ID: <a3fd2c41-fd2d-40fc-8a1d-0f8e83467279@linaro.org>
Date: Mon, 16 Sep 2024 13:50:08 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Mao Jinlong <quic_jinlmao@...cinc.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Bjorn Andersson <quic_bjorande@...cinc.com>,
 Geert Uytterhoeven <geert+renesas@...der.be>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Neil Armstrong <neil.armstrong@...aro.org>, Arnd Bergmann <arnd@...db.de>,
 'Nícolas F . R . A . Prado'
 <nfraprado@...labora.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: defconfig: Enable Ftrace and STM configs

On 10/09/2024 11:21, Mao Jinlong wrote:
> Ftrace logs can be captured by STM over TMC sink path. We can enable
> ftrace logs along with HW trace of coresight component. The timestamp
> of ftrace logs and hw traces will be in sync which helps to debug.
> 
> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
> ---
>  arch/arm64/configs/defconfig | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 362df9390263..979f6eeecf2b 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -1588,6 +1588,12 @@ CONFIG_NVMEM_SNVS_LPGPR=y
>  CONFIG_NVMEM_SPMI_SDAM=m
>  CONFIG_NVMEM_SUNXI_SID=y
>  CONFIG_NVMEM_UNIPHIER_EFUSE=y
> +CONFIG_STM_PROTO_BASIC=m
> +CONFIG_STM_PROTO_SYS_T=m
> +CONFIG_STM_DUMMY=m
> +CONFIG_STM_SOURCE_CONSOLE=m
> +CONFIG_STM_SOURCE_HEARTBEAT=m
> +CONFIG_STM_SOURCE_FTRACE=m
>  CONFIG_FPGA=y
>  CONFIG_FPGA_MGR_ALTERA_CVP=m
>  CONFIG_FPGA_MGR_STRATIX10_SOC=m
> @@ -1703,7 +1709,6 @@ CONFIG_MAGIC_SYSRQ=y
>  CONFIG_DEBUG_FS=y
>  # CONFIG_SCHED_DEBUG is not set
>  # CONFIG_DEBUG_PREEMPT is not set
> -# CONFIG_FTRACE is not set

That's a user-visible symbol. You must select it explicitly.

Best regards,
Krzysztof