linux-kernel - Re: [PATCH v5] kernel.h: add comments for enum system

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Message-ID: <20250906105851.7c28416c@foz.lan>
Date: Sat, 6 Sep 2025 10:58:51 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Pavel Machek <pavel@....cz>, Len Brown
 <len.brown@...el.com>, linux-pm@...r.kernel.org, Jonathan Corbet
 <corbet@....net>, Jani Nikula <jani.nikula@...ux.intel.com>,
 linux-doc@...r.kernel.org, Mauro Carvalho Chehab <mchehab@...nel.org>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH v5] kernel.h: add comments for enum system_states

Em Fri,  5 Sep 2025 22:27:58 -0700
Randy Dunlap <rdunlap@...radead.org> escreveu:

> Provide some basic comments about the system_states and what they imply.
> Also convert the comments to kernel-doc format.
> 
> Split the enum declaration from the definition of the system_state
> variable so that kernel-doc notation works cleanly with it.
> This is picked up by Documentation/driver-api/basics.rst so it
> does not need further inclusion in the kernel docbooks.
> 
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Acked-by: Rafael J. Wysocki <rafael@...nel.org> # v1
> ---
> v2: add Rafael's Ack.
> v3: add Andrew
> v4: add DOC: so that this DOC: block can be used in Documentation/
>     add Greg K-H
>     add Jon Corbet, Mauro Chehab, & linux-doc
> v5: split enum declaration and definition (Jani Nikula)
>     drop the DOC: block since it is no longer needed
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Len Brown <len.brown@...el.com>
> Cc: linux-pm@...r.kernel.org
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: linux-doc@...r.kernel.org
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
> ---
>  include/linux/kernel.h |   21 +++++++++++++++++----
>  1 file changed, 17 insertions(+), 4 deletions(-)
> 
> --- linux-next-20250819.orig/include/linux/kernel.h
> +++ linux-next-20250819/include/linux/kernel.h
> @@ -164,11 +164,23 @@ extern int root_mountflags;
>  
>  extern bool early_boot_irqs_disabled;
>  
> -/*
> - * Values used for system_state. Ordering of the states must not be changed
> +/**
> + * enum system_states - Values used for system_state.
> + *

> + * * @SYSTEM_BOOTING:	%0, no init needed
> + * * @SYSTEM_SCHEDULING: system is ready for scheduling; OK to use RCU
> + * * @SYSTEM_FREEING_INITMEM: system is freeing all of initmem; almost running
> + * * @SYSTEM_RUNNING:	system is up and running
> + * * @SYSTEM_HALT:	system entered clean system halt state
> + * * @SYSTEM_POWER_OFF:	system entered shutdown/clean power off state
> + * * @SYSTEM_RESTART:	system entered emergency power off or normal restart
> + * * @SYSTEM_SUSPEND:	system entered suspend or hibernate state

You forgot to drop the extra asterisk at the above. definitions.

Fixing it, feel free to add:

Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

> + *
> + * Note:
> + * Ordering of the states must not be changed
>   * as code checks for <, <=, >, >= STATE.
>   */
> -extern enum system_states {
> +enum system_states {
>  	SYSTEM_BOOTING,
>  	SYSTEM_SCHEDULING,
>  	SYSTEM_FREEING_INITMEM,
> @@ -177,7 +189,8 @@ extern enum system_states {
>  	SYSTEM_POWER_OFF,
>  	SYSTEM_RESTART,
>  	SYSTEM_SUSPEND,
> -} system_state;
> +};
> +extern enum system_states system_state;
>  
>  /*
>   * General tracing related utility functions - trace_printk(),



Thanks,
Mauro