netdev - Re: [PATCH v3] mac80211: LLVMLinux: Remove VLAIS usage from mac80211

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Date:	Wed, 19 Mar 2014 07:25:37 -0700
From:	Behan Webster <behanw@...verseincode.com>
To:	Johannes Berg <johannes@...solutions.net>
CC:	linville@...driver.com, davem@...emloft.net,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	dwmw2@...radead.org, pageexec@...email.hu,
	Jan-Simon Möller <dl9pf@....de>,
	Vinícius Tinti <viniciustinti@...il.com>,
	Mark Charlebois <charlebm@...il.com>
Subject: Re: [PATCH v3] mac80211: LLVMLinux: Remove VLAIS usage from mac80211

On 03/19/14 06:51, Johannes Berg wrote:
> I'm confused.
>
> On Tue, 2014-03-18 at 20:32 -0700, behanw@...verseincode.com wrote:
>
>
>>   	struct scatterlist assoc, pt, ct[2];
>> -	struct {
>> -		struct aead_request	req;
>> -		u8			priv[crypto_aead_reqsize(tfm)];
>> -	} aead_req;
>>   
>> -	memset(&aead_req, 0, sizeof(aead_req));
>> +	char aead_req_data[sizeof(struct aead_request) +
>> +		crypto_aead_reqsize(tfm)]
>> +		__aligned(__alignof__(struct aead_request));
> This looks fine, though I'd argue the blank lines before/after it
> shouldn't be there, and the indentation should be a bit different, but I
> was willing to clean that up.
Will fix.

>>   int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
>>   			      u8 *data, size_t data_len, u8 *mic)
>>   {
>>   	struct scatterlist assoc, pt, ct[2];
>> -	struct {
>> -		struct aead_request	req;
>> -		u8			priv[crypto_aead_reqsize(tfm)];
>> -	} aead_req;
>>   
>> -	memset(&aead_req, 0, sizeof(aead_req));
>> +	char aead_req_data[sizeof(struct aead_request) +
>> +				crypto_aead_reqsize(tfm) +
>> +				CRYPTO_MINALIGN] CRYPTO_MINALIGN_ATTR;
> But why does the second instance use a completely different size/align?
Because I neglected to update it in both places. Sorry. Will fix.

Behan

-- 
Behan Webster
behanw@...verseincode.com

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