linux-kernel - Re: [PATCH V3 1/4] arm_pmu: acpi: Refactor arm_spe_acpi_register

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Message-ID: <89058c7c-1fed-60ea-7233-04187772a931@arm.com>
Date:   Thu, 3 Aug 2023 11:43:27 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, suzuki.poulose@....com
Cc:     Sami Mujawar <sami.mujawar@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        coresight@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/4] arm_pmu: acpi: Refactor
 arm_spe_acpi_register_device()



On 8/3/23 11:26, Anshuman Khandual wrote:
> +	/*
> +	 * Sanity check all the GICC tables for the same interrupt
> +	 * number. For now, only support homogeneous ACPI machines.
> +	 */
> +	for_each_possible_cpu(cpu) {
> +		struct acpi_madt_generic_interrupt *gicc;
> +
> +		gicc = acpi_cpu_get_madt_gicc(cpu);
> +		if (gicc->header.length < len)
> +			return gsi ? -ENXIO : 0;
> +
> +		this_gsi = parse_gsi(gicc);
> +		if (!this_gsi)
> +			return gsi ? -ENXIO : 0;

Hello Will,

Moved parse_gsi() return code checking to its original place just to
make it similar in semantics to existing 'gicc->header.length check'.
If 'gsi' is valid i.e atleast a single cpu has been probed, return
-ENXIO indicating mismatch, otherwise just return 0.

- Anshuman