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From: Peter Zijlstra <peterz@infradead.org>
To: "Li,Rongqing" <lirongqing@baidu.com>
Cc: Michel Lespinasse <michel@lespinasse.org>,
	"dbueso@suse.de" <dbueso@suse.de>,
	"mingo@kernel.org" <mingo@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: 答复: [PATCH] rbtree: stop iteration early in rb_find_first
Date: Wed, 25 Aug 2021 19:18:50 +0200	[thread overview]
Message-ID: <20210825171850.GD17784@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <90ea3457ddc7485fbc8db5f7ca5b07ab@baidu.com>

On Wed, Aug 25, 2021 at 04:01:53PM +0000, Li,Rongqing wrote:
> 
> >>
> >>
> >>                         10
> >>                       /
> >>                      5
> >>                       \
> >>                        10
> >>
> >> The search would stop after visiting node 5, and miss the leaf which
> >> is the expected node to be returned.
> 
> thanks for explanation.
> 
> >Just to clarify; the current code *does* work here. The proposed patch
> >breaks it.
> 
> 
> true, my patch is wrong.
> 
> but rb_find_first seems have other issue.  when the key is equal, we should search right leaf, not left leaf

That again breaks the above case.

  parent reply	other threads:[~2021-08-25 17:20 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
2021-08-25 16:08         ` 答复: " Li,Rongqing
     [not found]         ` <90ea3457ddc7485fbc8db5f7ca5b07ab@baidu.com>
2021-08-25 17:18           ` Peter Zijlstra [this message]
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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