linux-kernel - Re: [Patch]Introduce get_reason

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Date:	Fri, 16 Mar 2012 13:51:18 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Seiji Aguchi <seiji.aguchi@....com>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Luck, Tony (tony.luck@...el.com)" <tony.luck@...el.com>,
	"Chen Gong (gong.chen@...ux.intel.com)" <gong.chen@...ux.intel.com>,
	"Matthew Garrett (mjg@...hat.com)" <mjg@...hat.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: Re: [Patch]Introduce get_reason_str() to pstore

On Fri, Mar 16, 2012 at 01:01:49PM -0400, Seiji Aguchi wrote:
> Hi,
> 
> Recently, there has been some changes in kmsg_dump() below and they have been applied to linus-tree. 
>  (1) kmsg_dump(KMSG_DUMP_KEXEC) was removed.
>      http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=a3dd3323058d281abd584b15ad4c5b65064d7a61
> 
>  (2) A order of "enum kmsg_dump_reason" was modified.
>      http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=c22ab332902333f83766017478c1ef6607ace681
> 
>  This patch removes reason_str array and add get_reason_str() in accordance with Adrian's comment below.
>  https://lkml.org/lkml/2012/3/16/63

Future proofs things a little bit.  Looks good to me.

Acked-by: Don Zickus <dzickus@...hat.com>

> 
>  Signed-off-by: Seiji Aguchi <seiji.aguchi@....com>
>  Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> 
> ---
>  fs/pstore/platform.c |   30 ++++++++++++++++++++++--------
>  1 files changed, 22 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 9ec22d3..82c585f 100644
> --- a/fs/pstore/platform.c
> +++ b/fs/pstore/platform.c
> @@ -68,9 +68,25 @@ void pstore_set_kmsg_bytes(int bytes)
>  /* Tag each group of saved records with a sequence number */
>  static int	oopscount;
>  
> -static char *reason_str[] = {
> -	"Oops", "Panic", "Kexec", "Restart", "Halt", "Poweroff", "Emergency"
> -};
> +static const char *get_reason_str(enum kmsg_dump_reason reason) {
> +	switch (reason) {
> +	case KMSG_DUMP_PANIC:
> +		return "Panic";
> +	case KMSG_DUMP_OOPS:
> +		return "Oops";
> +	case KMSG_DUMP_EMERG:
> +		return "Emergency";
> +	case KMSG_DUMP_RESTART:
> +		return "Restart";
> +	case KMSG_DUMP_HALT:
> +		return "Halt";
> +	case KMSG_DUMP_POWEROFF:
> +		return "Poweroff";
> +	default:
> +		return "Unknown";
> +	}
> +}
>  
>  /*
>   * callback from kmsg_dump. (s2,l2) has the most recently @@ -85,17 +101,15 @@ static void pstore_dump(struct kmsg_dumper *dumper,
>  	unsigned long	s1_start, s2_start;
>  	unsigned long	l1_cpy, l2_cpy;
>  	unsigned long	size, total = 0;
> -	char		*dst, *why;
> +	char		*dst;
> +	const char	*why;
>  	u64		id;
>  	int		hsize, ret;
>  	unsigned int	part = 1;
>  	unsigned long	flags = 0;
>  	int		is_locked = 0;
>  
> -	if (reason < ARRAY_SIZE(reason_str))
> -		why = reason_str[reason];
> -	else
> -		why = "Unknown";
> +	why = get_reason_str(reason);
>  
>  	if (in_nmi()) {
>  		is_locked = spin_trylock(&psinfo->buf_lock);
> --
> 1.7.1
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