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Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by desiato.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uw2Sr-00000005Vbf-31GG for linux-arm-kernel@lists.infradead.org; Tue, 09 Sep 2025 17:49:11 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 7075044650; Tue, 9 Sep 2025 17:49:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 62C76C4CEF4; Tue, 9 Sep 2025 17:49:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757440147; bh=dxPAsbymTt+2g3KenuhxFFmvOkl11y5Fp2bkmw8Ct/g=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=N0S+uaGinTB3cu7jOiNzGyn2hcOD51Dkxa/sDAwGL8P92yD3o9ISvL8spANEQ+hKM FZSNZcxQrNYiDWUkGSZ4M+h9ikmQqOxxz+uilsdXL3CPigdsqiJ2fvNuIR0qzvgK8J 48iDYqW0h0UkdY3vRgi9NbU4qx35++yrm7UqmVSKXPSCSUVkVjOCny3OXbw3DM8ERX QG36XpJORsHYTxu9L9vc9S0SVhk9x6vVkwSbvA97dpv6IxIZmwPjXqnYjj5T4rTiOE Lce3KKghon9cXNm4ZOsQCln4/cKvQINKG9Xi0NXWnU9I4RM9zOepYiejM6Zpyhw4G7 9n2poKzeVUxUA== Message-ID: <81d4dfd8-7e6b-44e1-859a-c993ad174a5d@kernel.org> Date: Tue, 9 Sep 2025 19:49:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] soc: samsung: exynos-pmu: Fix for CONFIG_DEBUG_PREEMPT To: Will Deacon Cc: Mostafa Saleh , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, alim.akhtar@samsung.com, Peter Griffin , =?UTF-8?Q?Andr=C3=A9_Draszik?= References: <20250905162446.88987-1-smostafa@google.com> <19a6f296-eb40-49cf-9571-2d7964cd3313@kernel.org> <84332e77-cfd2-4090-a3c0-114a9eb5422a@kernel.org> <52222467-4fc0-4a53-9682-a935ec8f1a44@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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250909_184910_159872_6FD0F631 X-CRM114-Status: GOOD ( 17.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 09/09/2025 19:03, Will Deacon wrote: > On Tue, Sep 09, 2025 at 05:43:16PM +0200, Krzysztof Kozlowski wrote: >> On 09/09/2025 12:15, Will Deacon wrote: >>> Krzysztof, >>> >>> On Sat, Sep 06, 2025 at 09:07:02AM +0200, Krzysztof Kozlowski wrote: >>>> On 05/09/2025 19:43, Mostafa Saleh wrote: >>>>>>> >>>>>>> As this value is only read once, it doesn't require to be stable, so >>>>>> >>>>>> Why it does not need to be stable? Onlining wrong CPU number is not >>>>>> desired... >>>>>> >>>>>>> just use "raw_smp_processor_id" instead. >>>>>> >>>>>> You might be just hiding some other real issue, because above stacktrace >>>>>> is from gs101_cpuhp_pmu_online() which IRQs disabled and preemption >>>>>> disabled. Provide analysis of the warning, instead of just making it >>>>>> disappear. >>>>> >>>>> Not sure I understand, how is preemption disabled? that wouldn't fire >>>>> in that case. >>>> >>>> Because there is explicit preempt_disable(). >>> >>> Where do you see that? >> >> I did look at the code. >> >> All the calls I saw (including calltrace from commit msg) were under raw >> spinlock and raw spinlock does: >> >> preempt_disable(); > > The backtrace doesn't contain a raw spinlock. As Peter subsequently How backtrace could contain spinlock? Backtrace points you the calls and clearly in these calls in the source code there is raw spinlock. > pointed out, the reported issue has been fixed in linux-next and there's Not in Linux next, but in maintainer tree. Who is going to apply the patch? Maintainer. On what tree? Maintainer's tree. > a raw spinlock there but since the report is from vanilla -rc4, it > doesn't have that fix. So that's the argument - instead of trying maintainer's tree or linux-next, or even trying to put some effort and investigate why maintainer claims that "gs101_cpuhp_pmu_online() which IRQs disabled and preemption disabled." you just respond "there is no fix in rc release". I gave the technical objection based on reading code. Contributor instead of checking this or doing basic work - developing on tree which has fixes, just bounced back. And you complain that I "could try a bit harder to fill". Keep such comments to yourself. Best regards, Krzysztof