linux-kernel - Re: [PATCH v5 5/5] x86/CPU/AMD: Print the reason for the last reset

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Message-ID: <20250430190333.GIaBJ0BWuMdZ1KNVQ7@fat_crate.local>
Date: Wed, 30 Apr 2025 21:03:33 +0200
From: Borislav Petkov <bp@...en8.de>
To: Mario Limonciello <superm1@...nel.org>
Cc: Jean Delvare <jdelvare@...e.com>, Andi Shyti <andi.shyti@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Jonathan Corbet <corbet@....net>,
	Mario Limonciello <mario.limonciello@....com>,
	Yazen Ghannam <yazen.ghannam@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Shyam Sundar S K <Shyam-sundar.S-k@....com>,
	Hans de Goede <hdegoede@...hat.com>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:I2C/SMBUS CONTROLLER DRIVERS FOR PC" <linux-i2c@...r.kernel.org>,
	"open list:AMD PMC DRIVER" <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH v5 5/5] x86/CPU/AMD: Print the reason for the last reset

On Tue, Apr 22, 2025 at 06:48:30PM -0500, Mario Limonciello wrote:
> +	/* Iterate on each bit in the 'value' mask: */
> +	while (true) {
> +		bit = find_next_bit(&value, BITS_PER_LONG, bit + 1);
> +
> +		/* Reached the end of the word, no more bits: */
> +		if (bit >= BITS_PER_LONG) {
> +			if (!nr_reasons)
> +				pr_info("x86/amd: Previous system reset reason [0x%08lx]: Unknown\n", value);
> +			break;
> +		}
> +
> +		if (!s5_reset_reason_txt[bit])
> +			continue;
> +
> +		nr_reasons++;
> +		pr_info("x86/amd: Previous system reset reason [0x%08lx]: %s\n",
> +			value, s5_reset_reason_txt[bit]);
> +	}

What happened to that simpler idea:

https://lore.kernel.org/r/20250411125050.GEZ_kQKtYBfEMDQuXU@fat_crate.local

?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette