Re: [PATCH AUTOSEL 5.15 13/24] tools: Fix math.h breakage

[Matthew Wilcox]

On Mon, Dec 06, 2021 at 04:12:18PM -0500, Sasha Levin wrote:
> From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
> 
> [ Upstream commit d6e6a27d960f9f07aef0b979c49c6736ede28f75 ]
> 
> Commit 98e1385ef24b ("include/linux/radix-tree.h: replace kernel.h with
> the necessary inclusions") broke the radix tree test suite in two
> different ways; first by including math.h which didn't exist in the
> tools directory, and second by removing an implicit include of
> spinlock.h before lockdep.h.  Fix both issues.

I'm confused.  Was 98e1385ef24b backported to v5.15?  I don't see it
in linux-5.15.y, and I don't know why it would be considered a stable
backport candidate.  If not, why would this patch be needed?