Re: Please can I have a stable KCSAN branch for 5.8?

From: Paul E. McKenney
Date: Wed May 06 2020 - 10:36:18 EST


On Wed, May 06, 2020 at 02:28:17PM +0100, Will Deacon wrote:
> Hi TIP folks,
>
> I'm looking to rebase my READ_ONCE() series [1] on top of the KCSAN patches
> so that we can get them in for 5.8. However, tip/locking/kcsan seems to be
> missing some bits:
>
> * An update to checkpatch.pl to warn about missing comments for
> data_race():
>
> https://lore.kernel.org/r/20200401101714.44781-1-elver@xxxxxxxxxx

For some reason, I thought this was going up some other tree, but I do
not see it in -next. So unless I hear otherwise, I will pull it into
the v5.8 kcsan branch.

> * I'm unable to apply these two patches from Marco that are needed for
> my READ_ONCE() work:
>
> https://lore.kernel.org/lkml/20200424154730.190041-1-elver@xxxxxxxxxx/
>
> I think these depend on stuff that has been queued by Paul, and appears
> in linux-next, but to be honest with you I'm quite confused about what
> is queued for 5.8 and what isn't.

This one is queued, but I currently have it in the v5.9 pile (but
tentatively for v5.8). Unless Marco tells me otherwise, I will move it
to the v5.8 branch, which will be part of my pull request next week.

> What's the best base for me to use?

The -next tree has the latter, but not yet the former.

Hopefully we can get this straightened out, and please accept my apologies
for the hassle!

Thanx, Paul

> Cheers,
>
> Will
>
> [1] https://lore.kernel.org/r/20200421151537.19241-1-will@xxxxxxxxxx