linux-kernel - Re: [PATCH] net: Add back alignment for size for __alloc

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Message-Id: <20111102.191716.1682282796914825621.davem@davemloft.net>
Date:	Wed, 02 Nov 2011 19:17:16 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	tony@...mide.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] net: Add back alignment for size for __alloc_skb

c> 
> The issue is calculation of skb->end, which is based upon calculated
> 'size' variable.
> 
> skb->end determines alignment of skb_shared_info, which is where the
> alignment problem is occuring for Tony.

Right, and SMP_CACHE_BYTES setting should save us in any case.

For ARM, SMP_CACHE_BYTES seems to be set to L1_CACHE_BYTES which in
turn is set via ARM_L1_CACHE_SHIFT which can be set seemingly to any
value but the defaults are 5 and 6 which should be OK.

So unless Tony is using a non-standard setting of ARM_L1_CACHE_SHIFT,
this report is a bit mysterious.
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