linux-kernel - Re: [PATCH v1 1/1] powerpc/prom_init: Move custom isspace() to its own namespace

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Date:   Wed, 09 Jun 2021 17:00:16 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v1 1/1] powerpc/prom_init: Move custom isspace() to its
 own namespace

Andy Shevchenko <andriy.shevchenko@...ux.intel.com> writes:
> On Mon, May 10, 2021 at 05:49:25PM +0300, Andy Shevchenko wrote:
>> If by some reason any of the headers will include ctype.h
>> we will have a name collision. Avoid this by moving isspace()
>> to the dedicate namespace.
>> 
>> First appearance of the code is in the commit cf68787b68a2
>> ("powerpc/prom_init: Evaluate mem kernel parameter for early allocation").
>
> Any comments on this?

Looks fine. Thanks.

I just missed it because it came in a bit early, I tend not to pick
things up until rc2.

I tweaked the formatting of prom_isxdigit() slightly now that we allow
100 column lines.

Have put it in my next-test now.

cheers

>> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
>> index 41ed7e33d897..6845cbbc0cd4 100644
>> --- a/arch/powerpc/kernel/prom_init.c
>> +++ b/arch/powerpc/kernel/prom_init.c
>> @@ -701,13 +701,13 @@ static int __init prom_setprop(phandle node, const char *nodename,
>>  }
>>  
>>  /* We can't use the standard versions because of relocation headaches. */
>> -#define isxdigit(c)	(('0' <= (c) && (c) <= '9') \
>> -			 || ('a' <= (c) && (c) <= 'f') \
>> -			 || ('A' <= (c) && (c) <= 'F'))
>> +#define prom_isxdigit(c)	(('0' <= (c) && (c) <= '9') \
>> +				 || ('a' <= (c) && (c) <= 'f') \
>> +				 || ('A' <= (c) && (c) <= 'F'))
>>  
>> -#define isdigit(c)	('0' <= (c) && (c) <= '9')
>> -#define islower(c)	('a' <= (c) && (c) <= 'z')
>> -#define toupper(c)	(islower(c) ? ((c) - 'a' + 'A') : (c))
>> +#define prom_isdigit(c)		('0' <= (c) && (c) <= '9')
>> +#define prom_islower(c)		('a' <= (c) && (c) <= 'z')
>> +#define prom_toupper(c)		(prom_islower(c) ? ((c) - 'a' + 'A') : (c))
>>  
>>  static unsigned long prom_strtoul(const char *cp, const char **endp)
>>  {
>> @@ -716,14 +716,14 @@ static unsigned long prom_strtoul(const char *cp, const char **endp)
>>  	if (*cp == '0') {
>>  		base = 8;
>>  		cp++;
>> -		if (toupper(*cp) == 'X') {
>> +		if (prom_toupper(*cp) == 'X') {
>>  			cp++;
>>  			base = 16;
>>  		}
>>  	}
>>  
>> -	while (isxdigit(*cp) &&
>> -	       (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
>> +	while (prom_isxdigit(*cp) &&
>> +	       (value = prom_isdigit(*cp) ? *cp - '0' : prom_toupper(*cp) - 'A' + 10) < base) {
>>  		result = result * base + value;
>>  		cp++;
>>  	}
>> -- 
>> 2.30.2
>> 
>
> -- 
> With Best Regards,
> Andy Shevchenko