Received-SPF: pass (google.com: domain of linux-kernel+bounces-3395-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Feedback-ID: i787e41f1:Fastmail
Date: Mon, 18 Dec 2023 11:59:58 +0100
From: Greg KH <greg@kroah.com>
To: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	maple-tree@lists.infradead.org, akpm@linux-foundation.org,
	willy@infradead.org, liam.howlett@oracle.com,
	zhangpeng.00@bytedance.com, stable@vger.kernel.org
Subject: Re: [PATCH 6.6.y] maple_tree: do not preallocate nodes for slot
 stores
Message-ID: <2023121847-cope-surviving-26bf@gregkh>
References: <20231212195255.219624-1-sidhartha.kumar@oracle.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20231212195255.219624-1-sidhartha.kumar@oracle.com>

On Tue, Dec 12, 2023 at 11:52:55AM -0800, Sidhartha Kumar wrote:
> mas_preallocate() defaults to requesting 1 node for preallocation and then
> ,depending on the type of store, will update the request variable. There
> isn't a check for a slot store type, so slot stores are preallocating the
> default 1 node. Slot stores do not require any additional nodes, so add a
> check for the slot store case that will bypass node_count_gfp(). Update
> the tests to reflect that slot stores do not require allocations.
> 
> User visible effects of this bug include increased memory usage from the
> unneeded node that was allocated.
> 
> Fixes: 0b8bb544b1a7 ("maple_tree: update mas_preallocate() testing")
> Cc: <stable@vger.kernel.org> # 6.6+
> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
> ---
> This is a modified backport as the patch to fix this in upstream does not
> apply to 6.6 because the node_end field was moved from the ma_wr_state to
> the ma_state after 6.6.

What is the git commit id of this change in Linus's tree?

thanks,

greg k-h