linux-kernel - Re: [PATCH 1/3] drivers/edac: Add L1 and L2 error detection for A72

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Message-ID: <ea19ad06-142c-4d7e-83ba-00b9b7e3cdaf@linux.microsoft.com>
Date: Tue, 20 May 2025 09:09:29 -0700
From: Vijay Balakrishna <vijayb@...ux.microsoft.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Tony Luck <tony.luck@...el.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, James Morse <james.morse@....com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Robert Richter
 <rric@...nel.org>, linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
 Tyler Hicks <code@...icks.com>, Marc Zyngier <maz@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] drivers/edac: Add L1 and L2 error detection for A72

On 5/19/2025 1:51 AM, Borislav Petkov wrote:
> I'd venture a guess you need to protect here against CPU hotplug...
> 
>> +	for_each_cpu_and(cpu, cpu_online_mask, &compat_mask) {
>> +		smp_call_function_single(cpu, read_errors, &merrsr, true);
>> +		report_errors(edac_ctl, cpu, &merrsr);
>> +	}
>> +}
>> +

Hi Boris,

I appreciate you highlighting the CPU hotplug issue. Upon further review 
of surrounding code, I realized we must ensure that the data passed to 
read_errors() is per-CPU.

Thank you for your review. I will address the remainder of your comments 
promptly.

Vijay