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From: Peter Zijlstra <peterz@infradead.org>
To: Michel Lespinasse <michel@lespinasse.org>
Cc: Li RongQing <lirongqing@baidu.com>,
	dbueso@suse.de, mingo@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] rbtree: stop iteration early in rb_find_first
Date: Wed, 25 Aug 2021 15:21:46 +0200	[thread overview]
Message-ID: <YSZD6suya8fR/2uY@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210825115859.GB4645@lespinasse.org>

On Wed, Aug 25, 2021 at 04:58:59AM -0700, Michel Lespinasse wrote:
> > NAK. This looked slightly wrong before, and is more wrong after.

> Actually, my explanation is wrong too :) but so is the code.
> A failing example would searching 10 in the following tree
> 
> 
>                         10
> 		       /
> 		      5
> 		       \
> 		        10
> 
> The search would stop after visiting node 5, and miss the leaf which
> is the expected node to be returned.

Just to clarify; the current code *does* work here. The proposed patch
breaks it.

  parent reply	other threads:[~2021-08-25 13:23 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25  9:59 Li RongQing
2021-08-25 11:39 ` Peter Zijlstra
2021-08-25 11:53   ` Michel Lespinasse
2021-08-25 11:58     ` Michel Lespinasse
2021-08-25 12:31       ` Peter Zijlstra
2021-08-25 13:21       ` Peter Zijlstra [this message]
2021-08-25 16:08         ` 答复: " Li,Rongqing
     [not found]         ` <90ea3457ddc7485fbc8db5f7ca5b07ab@baidu.com>
2021-08-25 17:18           ` Peter Zijlstra
2021-08-25 18:26             ` 答复: " Li,Rongqing
2021-08-25 19:20               ` Peter Zijlstra
2021-08-26  5:03                 ` 答复: " Li,Rongqing
2021-08-25 12:29     ` Peter Zijlstra
2021-08-25 12:32       ` Peter Zijlstra

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