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

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Message-ID: <1395237113.4142.5.camel@jlt4.sipsolutions.net>
Date:	Wed, 19 Mar 2014 14:51:53 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	behanw@...verseincode.com
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

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.

>  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?

johannes

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