linux-kernel - Re: [PATCH] rbtree: undo augmented damage -v2

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Date:	Thu, 03 Jun 2010 09:13:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Venkatesh Pallipadi <venki@...gle.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Fabio Checconi <fabio@...dalf.sssup.it>
Subject: Re: [PATCH] rbtree: undo augmented damage -v2

On Wed, 2010-06-02 at 14:11 -0700, Suresh Siddha wrote:
>       P                       SL
>     /  \                     /  \
>    N    S       --->        N    S
>   /   /  \                 /      \
>  C   SL  SR               C        SR
> 
> If P needs to be removed, we need to re-augment S also in this case,
> right? It looks like we are not handling this case.


rb_augment_erase_begin(P) will return S if I read the code right, so
rb_augment_path(S) will the re-augment S, SL, N.


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