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

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Message-ID: <5B726124.5030308@huawei.com>
Date:   Tue, 14 Aug 2018 12:57:08 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     Joe Perches <golf@...ches.com>
CC:     <tony.luck@...el.com>, <fenghua.yu@...el.com>,
        <benh@...nel.crashing.org>, <paulus@...ba.org>,
        <mpe@...erman.id.au>, <oleg@...hat.com>, <rppt@...ux.vnet.ibm.com>,
        <dhowells@...hat.com>, <akpm@...ux-foundation.org>,
        <viro@...iv.linux.org.uk>, <linux-ia64@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 1/2] ia64: Use ARRAY_SIZE to replace its implementation

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