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Date:   Thu, 3 Aug 2023 11:43:27 +0530
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Subject: Re: [PATCH V3 1/4] arm_pmu: acpi: Refactor
 arm_spe_acpi_register_device()
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To:     linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com
Cc:     Sami Mujawar <sami.mujawar@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Mike Leach <mike.leach@linaro.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        coresight@lists.linaro.org, linux-kernel@vger.kernel.org
References: <20230803055652.1322801-1-anshuman.khandual@arm.com>
 <20230803055652.1322801-2-anshuman.khandual@arm.com>
From:   Anshuman Khandual <anshuman.khandual@arm.com>
In-Reply-To: <20230803055652.1322801-2-anshuman.khandual@arm.com>
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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