Re: [PATCH 1/2] ia64: Use ARRAY_SIZE to replace its implementation

zhong jiang
2018-08-14T04:57:17Z

On 2018/8/14 12:45, Joe Perches wrote:
> On Tue, 2018-08-14 at 10:46 +0800, zhong jiang wrote:
>> We prefer to ARRAY_SIZE rather than duplicating its implementation.
>> So just replace it.
> []
>> diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
> []
>> @@ -4645,7 +4645,7 @@ static char *pfmfs_dname(struct dentry *dentry, char *buffer, int buflen)
>> /* 32 */PFM_CMD(pfm_write_ibrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL),
>> /* 33 */PFM_CMD(pfm_write_dbrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL)
>> };
>> -#define PFM_CMD_COUNT (sizeof(pfm_cmd_tab)/sizeof(pfm_cmd_desc_t))
>> +#define PFM_CMD_COUNT ARRAY_SIZE(pfm_cmd_tab)
> Better would be to remove the #define altogether and change
> the one place where it's used to ARRAY_SIZE(...)
> ---
> arch/ia64/kernel/perfmon.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
> index a9d4dc6c0427..08ece2c7b6e1 100644
> --- a/arch/ia64/kernel/perfmon.c
> +++ b/arch/ia64/kernel/perfmon.c
> @@ -4645,7 +4645,6 @@ static pfm_cmd_desc_t pfm_cmd_tab[]={
> /* 32 */PFM_CMD(pfm_write_ibrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL),
> /* 33 */PFM_CMD(pfm_write_dbrs, PFM_CMD_PCLRWS, PFM_CMD_ARG_MANY, pfarg_dbreg_t, NULL)
> };
> -#define PFM_CMD_COUNT (sizeof(pfm_cmd_tab)/sizeof(pfm_cmd_desc_t))
>
> static int
> pfm_check_task_state(pfm_context_t *ctx, int cmd, unsigned long flags)
> @@ -4770,7 +4769,7 @@ sys_perfmonctl (int fd, int cmd, void __user *arg, int count)
> */
> if (unlikely(pmu_conf == NULL)) return -ENOSYS;
>
> - if (unlikely(cmd < 0 || cmd >= PFM_CMD_COUNT)) {
> + if (unlikely(cmd < 0 || cmd >= ARRAY_SIZE(pfm_cmd_tab)) {
> DPRINT(("invalid cmd=%d\n", cmd));
> return -EINVAL;
> }
>
>
> .
>
Thank you for suggestion. That's indeed better if just one palce use it. I will repost in v2.

Sincerely,
zhong jiang