linux-kernel - Re: [PATCH 1/6] firewire: core: reduce stack usage in bus reset tasklet

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Message-ID: <4AA55BCF.6080609@s5r6.in-berlin.de>
Date:	Mon, 07 Sep 2009 21:15:27 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	pageexec@...email.hu
CC:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] firewire: core: reduce stack usage in bus reset tasklet

pageexec@...email.hu wrote:
> On 6 Sep 2009 at 18:48, Stefan Richter wrote:
> 
>> Index: linux-2.6.31-rc9/drivers/firewire/core-card.c
>> ===================================================================
>> --- linux-2.6.31-rc9.orig/drivers/firewire/core-card.c
>> +++ linux-2.6.31-rc9/drivers/firewire/core-card.c
>> @@ -38,16 +38,21 @@
>>  
>>  #include "core.h"
>>  
>> -int fw_compute_block_crc(u32 *block)
>> +int fw_compute_block_crc(u32 *block, gfp_t flags)
>>  {
>> -	__be32 be32_block[256];
>> -	int i, length;
>> +	static __be32 *be32_block;
>        ^^^^^^
> 
> did you actually mean that to be static? if so, then you might as well allocate the
> buffer statically and not worry about a runtime allocation failure.

Uh, that's a cut'n'paste mistake.  It shouldn't be static.  Thanks, I'll 
correct that before I put it into linux1394-2.6.git.

>> +	int i, length = (*block >> 16) & 0xff;
>> +
>> +	be32_block = kmalloc(length * 4, flags);
>> +	if (WARN_ON(!be32_block))
>> +		goto out;
>>  
>> -	length = (*block >> 16) & 0xff;
>>  	for (i = 0; i < length; i++)
>>  		be32_block[i] = cpu_to_be32(block[i + 1]);
>>  	*block |= crc_itu_t(0, (u8 *) be32_block, length * 4);
>>  
>> +	kfree(be32_block);
>> + out:
>>  	return length;
>>  }
> 
> 
> 


-- 
Stefan Richter
-=====-==--= =--= --===
http://arcgraph.de/sr/
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