Re: [PATCH 6.6.y] maple_tree: do not preallocate nodes for slot stores

[Sidhartha Kumar]

On 12/18/23 2:59 AM, Greg KH wrote:
> 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@xxxxxxxxxxxxxxx> # 6.6+
> > Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
> > ---
> > 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?

The patch is in akpm's mm-hotfixes-unstable tree and has not made it to Linus's 
tree yet.

Thanks,
Sid
> thanks,
>
> greg k-h