From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E65333A1696; Fri, 17 Apr 2026 12:57:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776430638; cv=none; b=XC78FyT78TR+z1Ct0AFKCKK/E6PpTNOPyi5bVIQjbj3KJzSQjURhIwsxDUBpT02gRYW9ybh2TwN4YPjnJrB9EISaaUb/ftFCMVqTx85RW8uAbvzLPWOg6epcDBis0FsF1KjINZGd2/CW6lfuNEd0WgklMXXj6MvXBas1gpPw3MU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776430638; c=relaxed/simple; bh=BFb+/5Hq+LoWDVPaMtjgyVFv1iEAec/tnXTSm5Up1mc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=DxAmJxTfBTnyAiLR+E0RNOsb71S7PpxEmwECCcTOZ08srMmtXt8+ixtgrkf1yQJe1cy25YNTR0q/psB4e1x5WPILhNMv7+vQ+6tQjRwjQ5sy0+mTKuZ9XHehzUhTNILvX96Q5Z2t/vOQ1Uv5tCGj8haEALHDf+AcY5o04SHRkwQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NzRxmT3E; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NzRxmT3E" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C42FC19425; Fri, 17 Apr 2026 12:57:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776430637; bh=BFb+/5Hq+LoWDVPaMtjgyVFv1iEAec/tnXTSm5Up1mc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=NzRxmT3El7y0795/8ErbbAzNrcf9NW8X09pZrlPAF/74UDxlrWQ4YEfx4xKmMX7rS Px0XeG2EWXKnjpN6sfq/+rMc3azy7OFg3KOCNGjHND2cgYMWrhajZdCVpJqEXzgEvu M9ReMeDSLN8DApwrr5EbtnVcdX8sGUAppHSL/99xYRkgpBRWRjgTai/xEQtoSxxTMb n7oqZP0/YgEvikbqGerA320Vtruwjnmpzs0Znt3u5qEw6uRO0FfmVzlnTYHJWzXIv9 hGujmxVuQczGOMzw1kOSr5GV6sz9YRQ37UTopclKEZcS+4mP8FyConbiKp3PpDCFu4 uodBIODmjuQfg== Message-ID: <2d1cfadc-68e3-4214-9ae4-f71a8e68f6b5@kernel.org> Date: Fri, 17 Apr 2026 14:57:13 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: defconfig: Enable Qualcomm UFS and QMP UFS PHY drivers as built-in To: Shawn Guo Cc: Bjorn Andersson , Konrad Dybcio , Krzysztof Kozlowski , Dmitry Baryshkov , Arnd Bergmann , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260417035509.1021860-1-shengchao.guo@oss.qualcomm.com> <898874b3-fb73-4a46-b440-6ea3377c2f2d@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/04/2026 12:37, Shawn Guo wrote: > On Fri, Apr 17, 2026 at 10:44:20AM +0200, Krzysztof Kozlowski wrote: >> On 17/04/2026 10:37, Shawn Guo wrote: >>> On Fri, Apr 17, 2026 at 10:14:23AM +0200, Krzysztof Kozlowski wrote: >>>> On 17/04/2026 05:55, Shawn Guo wrote: >>>>> UFS is the primary storage for Linux rootfs across the breadth of >>>>> Qualcomm development boards - Mobile, Automotive and IoT. With >>>>> Qualcomm UFS host controller driver (SCSI_UFS_QCOM) and the UFS PHY >>>>> driver (PHY_QCOM_QMP_UFS) as modules, developers need an initramfs >>>> >>>> Yes, you always need initramfs and every developer has it. >>>> >>>>> to boot from UFS, which adds friction to daily development workflows. >>>> >>>> No friction, it's both standard, easy and all of Qualcomm and Linaro >>>> developers have it solved long time ago. >>> >>> I'm looking at a kernel regression by running git bisect, where kernel >>> version string varies for every single boot. How do you usually deal >>> with it by using initramfs? >> >> No difference from every other build and boot? I build kernel and the >> same step I have initramfs with modules. Whether I bisect or build >> kernel for normal boot is exactly the same. >> >> The only difference is `git bisect good`. > > So we have to rebuild initramfs for every single bisect. But isn't > built-in make it easier and faster for the whole bisect process? You rebuild initramfs anyway always but itself it is fast command. Your change does not matter here - changed nothing. You anyway have to rebuild it so the modules will be placed there. > > It's especially useful for tasks where we do not even need to make modules, > like debugging built-in drivers. Nothing stops you from make it built-in, if you prefer. For me it is one argument ("-S qcom") for my build script. Other has other ways (scripts have even helper for that). Best regards, Krzysztof