linux-kernel - Re: [PATCH] maple_tree: Make maple state reusable after mas_empty

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Message-ID: <8143190d-91a2-70c5-41d0-2926197aea09@vigovproductions.net>
Date:   Thu, 4 May 2023 22:59:27 +0100
From:   Michael Keyes <mgkeyes@...ovproductions.net>
To:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "Liam.Howlett@...cle.com" <Liam.Howlett@...cle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Cc:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "Stable@...r.kernel.org" <Stable@...r.kernel.org>,
        "support@...tco.us" <support@...tco.us>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] maple_tree: Make maple state reusable after
 mas_empty_area()

On 04.05.23 20:10, Edgecombe, Rick P wrote:
> On Thu, 2023-05-04 at 13:55 -0400, Liam R. Howlett wrote:
>> Do not update the min and max of the maple state to the slot of the
>> leaf
>> node.  Leaving the min and max to the node entry allows for the maple
>> state to be used in other operations.
>>
>> Users would get unexpected results from other operations on the maple
>> state after calling the affected function.
>>
>> Reported-by: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
>> Reported-by: Tad <support@...tco.us>
>> Reported-by: Michael Keyes <mgkeyes@...ovproductions.net>
>> Link:
>> https://lore.kernel.org/linux-mm/32f156ba80010fd97dbaf0a0cdfc84366608624d.camel@intel.com/
>> Link:
>> https://lore.kernel.org/linux-mm/e6108286ac025c268964a7ead3aab9899f9bc6e9.camel@spotco.us/
>> Fixes: Fixes: 54a611b60590 ("Maple Tree: add new data structure")
>> Cc: <Stable@...r.kernel.org>
>> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
>> ---
> This fixes it for all the cases I encountered, thanks!
Me too. I had issues running an old version of LuaJIT, and it seems to
be running better than it had in a long time now! Thank you!

-- 
Michael