linux-kernel - Re: [PATCH 11/16] trivial: use ARRAY

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Message-ID: <20100629005826.GM10073@verge.net.au>
Date:	Tue, 29 Jun 2010 09:58:26 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	walter harms <wharms@....de>
Cc:	Kulikov Vasiliy <segooon@...il.com>, trivial@...nel.org,
	Kernel Janitors <kernel-janitors@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrea Gelmini <andrea.gelmini@...ma.net>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/16] trivial: use ARRAY_SIZE

On Mon, Jun 28, 2010 at 03:22:49PM +0200, walter harms wrote:
> 
> 
> walter harms schrieb:
> > 
> > Kulikov Vasiliy schrieb:
> >> Change sizeof(x) / sizeof(*x) to ARRAY_SIZE(x).
> >>
> >> Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
> >> ---
> >>  drivers/staging/otus/hal/hpreg.c |   17 +++++++----------
> >>  1 files changed, 7 insertions(+), 10 deletions(-)
> >>
> >> diff --git a/drivers/staging/otus/hal/hpreg.c b/drivers/staging/otus/hal/hpreg.c
> >> index da3b774..9b04653 100644
> >> --- a/drivers/staging/otus/hal/hpreg.c
> >> +++ b/drivers/staging/otus/hal/hpreg.c
> >> @@ -29,9 +29,6 @@
> >>  #include "hpreg.h"
> >>  #include "hpusb.h"
> >>  
> >> -/* used throughout this file... */
> >> -#define	N(a)	(sizeof(a) / sizeof(a[0]))
> >> -
> >>  #define HAL_MODE_11A_TURBO	HAL_MODE_108A
> >>  #define HAL_MODE_11G_TURBO	HAL_MODE_108G
> >>  
> >> @@ -1557,7 +1554,7 @@ u8_t GetWmRD(u16_t regionCode, u16_t channelFlag, REG_DOMAIN *rd)
> >>  	u64_t flags = NO_REQ;
> >>  	REG_DMN_PAIR_MAPPING *regPair = NULL;
> >>  
> >> -	for (i = 0, found = 0; (i < N(regDomainPairs)) && (!found); i++) {
> >> +	for (i = 0, found = 0; (i < ARRAY_SIZE(regDomainPairs)) && (!found); i++) {
> >>  		if (regDomainPairs[i].regDmnEnum == regionCode) {
> >>  			regPair = &regDomainPairs[i];
> >>  			found = 1;
> > 
> > 
> > 
> > This looks odd, i do not see the rest of the code but perhaps a break would help
> > to eleminate the "found" ??
> > 
> > just my two cents,
> >  wh
> > 
> 1554 u8_t GetWmRD(u16_t regionCode, u16_t channelFlag, REG_DOMAIN *rd)
> 1555 {
> 1556         s16_t i, found, regDmn;
> 1557         u64_t flags=NO_REQ;
> 1558         REG_DMN_PAIR_MAPPING *regPair=NULL;
> 1559
> 1560         for (i=0, found=0; (i<N(regDomainPairs))&&(!found); i++)
> 1561         {
> 1562                 if (regDomainPairs[i].regDmnEnum == regionCode)
> 1563                 {
> 1564                         regPair = &regDomainPairs[i];
> 1565                         found = 1;
> 1566                 }
> 1567         }
> 1568         if (!found)
> 1569         {
> 1570                 zm_debug_msg1("Failed to find reg domain pair ", regionCode);
> 1571                 return FALSE;
> 1572         }
> 
> 
> This is would stop at the first hit and work without found.
> Otherwise someone could add an {NULL} at the end of the array
> und use a while () that would eliminate the need for ARRAY_SIZE also.

Either of those suggestions sounds fine to me, but it sounds
like it should be in a separate patch.

> 
> re,
>  wh
> 
> for (i=0; i<ARRAY_SIZE(regDomainPairs);i++ )
> 	if (regDomainPairs[i].regDmnEnum == regionCode)
>                     { regPair = &regDomainPairs[i]; break ; }
> 
> if (!regPair) {
>         zm_debug_msg1("Failed to find reg domain pair ", regionCode);
>         return FALSE;
> }
> 
> 
> 
> --
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