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

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Message-Id: <20111102.190955.1902322759075682192.davem@davemloft.net>
Date:	Wed, 02 Nov 2011 19:09:55 -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

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 02 Nov 2011 23:55:11 +0100

> There is a problem with your kmalloc() or alignments on your architecture.
> 
> What is the SMP_CACHE_BYTES value ?

kmalloc() behavior doesn't have anything to do with this bug.

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.

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