linux-kernel - Re: [Patch -v3 3/4] checkpatch.pl the new kernel/reboot.c file.

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Date:	Mon, 15 Apr 2013 13:39:59 -0500
From:	Robin Holt <holt@....com>
To:	Joe Perches <joe@...ches.com>
Cc:	Robin Holt <holt@....com>, Ingo Molnar <mingo@...hat.com>,
	Russ Anderson <rja@....com>, Shawn Guo <shawn.guo@...aro.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michel Lespinasse <walken@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Patch -v3 3/4] checkpatch.pl the new kernel/reboot.c file.

On Mon, Apr 15, 2013 at 10:45:38AM -0700, Joe Perches wrote:
> On Mon, 2013-04-15 at 12:16 -0500, Robin Holt wrote:
> > I did allow the remaining 81 character line behind.  It did not seem
> > like it was worth changing.  Otherwise, it now passes checkpatch.pl.
> 
> trivia:
> 
> I'd make these changes on top of your patch:
> 
> o Additional OOM messages aren't necessary as a dump_stack is done
> o Add pr_fmt to prefix logging messages with "reboot: "
> o Remove periods from logging messages
> o Argument alignment
> o Rename file prefix to "reboot.c"
> o Add #include <linux/suspend.h> so it compiles

I added linux/suspend.h and also turned on HIBERNATE in my .config file.

Robin

> 
> ---
>  kernel/reboot.c | 26 ++++++++++++++------------
>  1 file changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/kernel/reboot.c b/kernel/reboot.c
> index 187a0d8..7adba53 100644
> --- a/kernel/reboot.c
> +++ b/kernel/reboot.c
> @@ -1,14 +1,17 @@
>  /*
> - *  linux/kernel/sys.c
> + *  linux/kernel/reboot.c
>   *
>   *  Copyright (C) 2013  Linus Torvalds
>   */
>  
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
>  #include <linux/export.h>
>  #include <linux/kexec.h>
>  #include <linux/kmod.h>
>  #include <linux/kmsg_dump.h>
>  #include <linux/reboot.h>
> +#include <linux/suspend.h>
>  #include <linux/syscalls.h>
>  #include <linux/syscore_ops.h>
>  
> @@ -96,9 +99,9 @@ void kernel_restart(char *cmd)
>  	migrate_to_reboot_cpu();
>  	syscore_shutdown();
>  	if (!cmd)
> -		pr_emerg("Restarting system.\n");
> +		pr_emerg("Restarting system\n");
>  	else
> -		pr_emerg("Restarting system with command '%s'.\n", cmd);
> +		pr_emerg("Restarting system with command '%s'\n", cmd);
>  	kmsg_dump(KMSG_DUMP_RESTART);
>  	machine_restart(cmd);
>  }
> @@ -107,7 +110,8 @@ EXPORT_SYMBOL_GPL(kernel_restart);
>  static void kernel_shutdown_prepare(enum system_states state)
>  {
>  	blocking_notifier_call_chain(&reboot_notifier_list,
> -		(state == SYSTEM_HALT) ? SYS_HALT : SYS_POWER_OFF, NULL);
> +				     state == SYSTEM_HALT ? SYS_HALT : SYS_POWER_OFF,
> +				     NULL);
>  	system_state = state;
>  	usermodehelper_disable();
>  	device_shutdown();
> @@ -122,7 +126,7 @@ void kernel_halt(void)
>  	kernel_shutdown_prepare(SYSTEM_HALT);
>  	migrate_to_reboot_cpu();
>  	syscore_shutdown();
> -	pr_emerg("System halted.\n");
> +	pr_emerg("System halted\n");
>  	kmsg_dump(KMSG_DUMP_HALT);
>  	machine_halt();
>  }
> @@ -140,7 +144,7 @@ void kernel_power_off(void)
>  		pm_power_off_prepare();
>  	migrate_to_reboot_cpu();
>  	syscore_shutdown();
> -	pr_emerg("Power down.\n");
> +	pr_emerg("Power down\n");
>  	kmsg_dump(KMSG_DUMP_POWEROFF);
>  	machine_power_off();
>  }
> @@ -169,10 +173,10 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
>  
>  	/* For safety, we require "magic" arguments. */
>  	if (magic1 != LINUX_REBOOT_MAGIC1 ||
> -			(magic2 != LINUX_REBOOT_MAGIC2 &&
> -			magic2 != LINUX_REBOOT_MAGIC2A &&
> -			magic2 != LINUX_REBOOT_MAGIC2B &&
> -			magic2 != LINUX_REBOOT_MAGIC2C))
> +	    (magic2 != LINUX_REBOOT_MAGIC2 &&
> +	     magic2 != LINUX_REBOOT_MAGIC2A &&
> +	     magic2 != LINUX_REBOOT_MAGIC2B &&
> +	     magic2 != LINUX_REBOOT_MAGIC2C))
>  		return -EINVAL;
>  
>  	/*
> @@ -281,8 +285,6 @@ static int __orderly_poweroff(bool force)
>  		ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
>  		argv_free(argv);
>  	} else {
> -		pr_warn("%s failed to allocate memory for \"%s\"\n",
> -					 __func__, poweroff_cmd);
>  		ret = -ENOMEM;
>  	}
>  
> 
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