linux-kernel - Re: [Slightly off topic] A question about R/B trees.

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Message-ID: <48FC9BB4.3050603@nortel.com>
Date:	Mon, 20 Oct 2008 08:54:44 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
CC:	Chris Snook <csnook@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [Slightly off topic] A question about R/B trees.

Maxim Levitsky wrote:

> Say you allocate a piece of memory using kmalloc, and write there, a
> structure that contains a r/b tree item. I agree that gcc will ensure
> that offset from start of that structure to first byte of the tree
> item will be aligned.
> 
> But what if malloc returned a misaligned pointer? This will ensure
> that virtual address of the tree item won't be aligned. (I know it
> doesn't, but this isn't a assumption about gcc anymore)

malloc() can't return a misaligned pointer.  From the spec:  "The 
pointer returned if the allocation succeeds shall be suitably aligned so 
that it may be assigned to a pointer to any type of object..."

Chris
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