linux-kernel - Re: [PATCH] ipmi: constify some struct and char arrays

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Date:	Mon, 16 Nov 2015 07:20:01 -0600
From:	Corey Minyard <minyard@....org>
To:	LABBE Corentin <clabbe.montjoie@...il.com>,
	openipmi-developer@...ts.sourceforge.net
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipmi: constify some struct and char arrays

Thanks for fixing the problem reported on this.  Queued for 4.5.

-corey

On 11/13/2015 06:31 AM, LABBE Corentin wrote:
> Lots of char arrays could be set as const since they contain only literal
> char arrays.
> We could in the same time make const some struct members who are pointer
> to those const char arrays.
>
> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
> ---
>  drivers/char/ipmi/ipmi_msghandler.c |  7 ++++---
>  drivers/char/ipmi/ipmi_si_intf.c    | 27 ++++++++++++++++-----------
>  2 files changed, 20 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
> index e3536da..94fb407 100644
> --- a/drivers/char/ipmi/ipmi_msghandler.c
> +++ b/drivers/char/ipmi/ipmi_msghandler.c
> @@ -472,9 +472,10 @@ static DEFINE_MUTEX(smi_watchers_mutex);
>  #define ipmi_get_stat(intf, stat) \
>  	((unsigned int) atomic_read(&(intf)->stats[IPMI_STAT_ ## stat]))
>  
> -static char *addr_src_to_str[] = { "invalid", "hotmod", "hardcoded", "SPMI",
> -				   "ACPI", "SMBIOS", "PCI",
> -				   "device-tree", "default" };
> +static const char * const addr_src_to_str[] = {
> +	"invalid", "hotmod", "hardcoded", "SPMI", "ACPI", "SMBIOS", "PCI",
> +	"device-tree", "default"
> +};
>  
>  const char *ipmi_addr_src_to_str(enum ipmi_addr_src src)
>  {
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 654f6f3..8d680c8 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -105,7 +105,8 @@ enum si_intf_state {
>  enum si_type {
>      SI_KCS, SI_SMIC, SI_BT
>  };
> -static char *si_to_str[] = { "kcs", "smic", "bt" };
> +
> +static const char * const si_to_str[] = { "kcs", "smic", "bt" };
>  
>  #define DEVICE_NAME "ipmi_si"
>  
> @@ -1319,7 +1320,7 @@ static unsigned int num_slave_addrs;
>  
>  #define IPMI_IO_ADDR_SPACE  0
>  #define IPMI_MEM_ADDR_SPACE 1
> -static char *addr_space_to_str[] = { "i/o", "mem" };
> +static const char * const addr_space_to_str[] = { "i/o", "mem" };
>  
>  static int hotmod_handler(const char *val, struct kernel_param *kp);
>  
> @@ -1701,27 +1702,31 @@ static int mem_setup(struct smi_info *info)
>   */
>  enum hotmod_op { HM_ADD, HM_REMOVE };
>  struct hotmod_vals {
> -	char *name;
> -	int  val;
> +	const char *name;
> +	const int  val;
>  };
> -static struct hotmod_vals hotmod_ops[] = {
> +
> +static const struct hotmod_vals hotmod_ops[] = {
>  	{ "add",	HM_ADD },
>  	{ "remove",	HM_REMOVE },
>  	{ NULL }
>  };
> -static struct hotmod_vals hotmod_si[] = {
> +
> +static const struct hotmod_vals hotmod_si[] = {
>  	{ "kcs",	SI_KCS },
>  	{ "smic",	SI_SMIC },
>  	{ "bt",		SI_BT },
>  	{ NULL }
>  };
> -static struct hotmod_vals hotmod_as[] = {
> +
> +static const struct hotmod_vals hotmod_as[] = {
>  	{ "mem",	IPMI_MEM_ADDR_SPACE },
>  	{ "i/o",	IPMI_IO_ADDR_SPACE },
>  	{ NULL }
>  };
>  
> -static int parse_str(struct hotmod_vals *v, int *val, char *name, char **curr)
> +static int parse_str(const struct hotmod_vals *v, int *val, char *name,
> +		     char **curr)
>  {
>  	char *s;
>  	int  i;
> @@ -2848,7 +2853,7 @@ static int ipmi_parisc_remove(struct parisc_device *dev)
>  	return 0;
>  }
>  
> -static struct parisc_device_id ipmi_parisc_tbl[] = {
> +static const struct parisc_device_id ipmi_parisc_tbl[] = {
>  	{ HPHW_MC, HVERSION_REV_ANY_ID, 0x004, 0xC0 },
>  	{ 0, }
>  };
> @@ -3422,8 +3427,8 @@ static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
>  
>  static const struct ipmi_default_vals
>  {
> -	int type;
> -	int port;
> +	const int type;
> +	const int port;
>  } ipmi_defaults[] =
>  {
>  	{ .type = SI_KCS, .port = 0xca2 },

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