linux-kernel - Re: [PATCH 06/68] 0 -> NULL, for arch/frv

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Date:	Fri, 27 Jul 2007 12:21:53 +0200
From:	Yoann Padioleau <padator@...adoo.fr>
To:	Al Viro <viro@....linux.org.uk>
Cc:	Yoann Padioleau <padator@...adoo.fr>,
	kernel-janitors@...r.kernel.org, dhowells@...hat.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/68] 0 -> NULL, for arch/frv

Al Viro <viro@....linux.org.uk> writes:

> On Fri, Jul 27, 2007 at 11:44:35AM +0200, Yoann Padioleau wrote:
>>  	pte = pte_alloc_kernel(pme, va);
>> -	if (pte != 0) {
>> +	if (pte != NULL) {
>>  		err = 0;
>>  		set_pte(pte, mk_pte_phys(pa & PAGE_MASK, prot));
>>  	}
>> @@ -99,7 +99,7 @@ void *consistent_alloc(gfp_t gfp, size_t
>>  
>>  	/* allocate some common virtual space to map the new pages */
>>  	area = get_vm_area(size, VM_ALLOC);
>> -	if (area == 0) {
>> +	if (area == NULL) {
>>  		free_pages(page, order);
>>  		return NULL;
>
> Same comment about comparisons with NULL after allocation...

I don't understand. pte is a pointer right ? So why should we
keep the == 0 ? 

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