linux-kernel - Re: [PATCH 2.6.19-rc6] sparc: replace kmalloc+memset with kzalloc

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Date:	Fri, 24 Nov 2006 21:02:53 +0200
From:	Yan Burman <burman.yan@...il.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	linux-kernel@...r.kernel.org, trivial@...nel.org,
	wli@...omorphy.com, sparclinux@...r.kernel.org
Subject: Re: [PATCH 2.6.19-rc6] sparc: replace kmalloc+memset with kzalloc

Stefan Richter wrote:
> Yan Burman wrote:
> ...
>   
>> --- linux-2.6.19-rc5_orig/arch/sparc/kernel/sun4d_irq.c	2006-11-09 12:16:21.000000000 +0200
>> +++ linux-2.6.19-rc5_kzalloc/arch/sparc/kernel/sun4d_irq.c	2006-11-11 22:44:04.000000000 +0200
>> @@ -545,8 +545,7 @@ void __init sun4d_init_sbi_irq(void)
>>  	nsbi = 0;
>>  	for_each_sbus(sbus)
>>  		nsbi++;
>> -	sbus_actions = (struct sbus_action *)kmalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
>> -	memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action)));
>> +	sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
>>  	for_each_sbus(sbus) {
>>  #ifdef CONFIG_SMP	
>>  		extern unsigned char boot_cpu_id;
>>     
>
> I'm not sure about this ^ hunk, but...
>
>   
>> diff -rubp linux-2.6.19-rc5_orig/arch/sparc/mm/io-unit.c linux-2.6.19-rc5_kzalloc/arch/sparc/mm/io-unit.c
>> --- linux-2.6.19-rc5_orig/arch/sparc/mm/io-unit.c	2006-11-09 12:16:21.000000000 +0200
>> +++ linux-2.6.19-rc5_kzalloc/arch/sparc/mm/io-unit.c	2006-11-11 22:44:04.000000000 +0200
>> @@ -41,9 +41,8 @@ iounit_init(int sbi_node, int io_node, s
>>  	struct linux_prom_registers iommu_promregs[PROMREG_MAX];
>>  	struct resource r;
>>  
>> -	iounit = kmalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
>> +	iounit = kzalloc(sizeof(struct iounit_struct), GFP_ATOMIC);
>>  
>> -	memset(iounit, 0, sizeof(*iounit));
>>  	iounit->limit[0] = IOUNIT_BMAP1_START;
>>  	iounit->limit[1] = IOUNIT_BMAP2_START;
>>  	iounit->limit[2] = IOUNIT_BMAPM_START;
>>     
>
> ...in this ^, the old code and your update don't check for NULL return.
>   

Both of this parts are done at early stages, so it is probably:
a) Impossible to recover from failure
b) If you run out of memory at this stage, you are probably in very big 
trouble anyway

I could modify it to check and panic if the check fails.
Would that be better?

-
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