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[24.53.241.2]) by smtp.gmail.com with ESMTPSA id 10-20020a05620a04ca00b0078a6a010d81sm1600271qks.49.2024.03.29.13.11.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 Mar 2024 13:11:08 -0700 (PDT) Message-ID: Date: Fri, 29 Mar 2024 16:11:06 -0400 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: PROBLEM: Only one CPU active on Ultra 60 since ~4.8 (regression) Content-Language: en-US To: Sam Ravnborg Cc: Linus Torvalds , linux-kernel@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org, Andreas Larsson , Linux regressions mailing list References: <1df92fec-7f57-5080-94ed-b149ed384280@leemhuis.info> <14dcd743-144a-9f7b-849c-0843d50e4c04@draconx.ca> <4dce7447-678d-4e60-b76e-b01988bd6515@leemhuis.info> <943c6d11-e214-43c8-8813-8e1aba6be15c@draconx.ca> <20240329094456.GA44268@ravnborg.org> From: Nick Bowler In-Reply-To: <20240329094456.GA44268@ravnborg.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Sam, On 2024-03-29 05:44, Sam Ravnborg wrote: > I took a look at this and may have a fix. Could you try the following > patch. It builds - but I have not tested it. With this patch applied on top of 6.9-rc1, both CPUs appear to come up: % cat /proc/cpuinfo [...] ncpus probed : 2 ncpus active : 2 [...] State: CPU0: online CPU2: online Thanks, Nick