linux-kernel - Re: [RFC PATCH v2 30/35] irqchip/gic-v3: Add support for ACPI's disabled but 'online capable' CPUs

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Date:   Thu, 14 Sep 2023 09:10:52 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     James Morse <james.morse@....com>
Cc:     linux-pm@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-acpi@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kvmarm@...ts.linux.dev,
        x86@...nel.org, Salil Mehta <salil.mehta@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        jianyong.wu@....com, justin.he@....com
Subject: Re: [RFC PATCH v2 30/35] irqchip/gic-v3: Add support for ACPI's
 disabled but 'online capable' CPUs

On Wed, Sep 13, 2023 at 04:38:18PM +0000, James Morse wrote:
>  static inline bool acpi_gicc_is_usable(struct acpi_madt_generic_interrupt *gicc)
>  {
> -	return (gicc->flags & ACPI_MADT_ENABLED);
> +	return ((gicc->flags & ACPI_MADT_ENABLED ||
> +		 gicc->flags & ACPI_MADT_GICC_CPU_CAPABLE));

... and this starts getting silly with the number of parens.

	return gicc->flags & ACPI_MADT_ENABLED ||
	       gicc->flags & ACPI_MADT_GICC_CPU_CAPABLE;

is entirely sufficient. Also:

	return gicc->flags & (ACPI_MADT_ENABLED | ACPI_MADT_GICC_CPU_CAPABLE);

also works.

-- 
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