Re: [PATCH -next v1 05/12] srcu: Don't queue workqueue handlers to never-online CPUs

On Sun, May 17, 2026 at 02:47:55PM +0200, Uladzislau Rezki wrote:
> On Wed, May 13, 2026 at 12:38:01PM +0200, Thorsten Leemhuis wrote:
> > On 5/11/26 19:54, Uladzislau Rezki (Sony) wrote:
> > > From: "Paul E. McKenney" <[email protected]>
> > > 
> > > While an srcu_struct structure is in the midst of switching from CPU-0
> > > to all-CPUs state, it can attempt to invoke callbacks for CPUs that
> > > have never been online.  Worse yet, it can attempt in invoke callbacks
> > > for CPUs that never will be online, even including imaginary CPUs not in
> > > cpu_possible_mask.  This can cause hangs on s390,
> > 
> > Uladzislau, Paul, according to the fixes tag below this change fixes a
> > change that went into 7.0-rc6 -- and apparently causes a "hang" on some
> > architectures. So shouldn't this be heading to mainline instead of
> > -next? Ideally with a stable tag to ensure backporting to 7.0.y, but
> > that is a separate decision?
> > 
> I assume it will be picked to stable since there is a "Fixes:" tag. From
> the other hand i can explicitly update commit message with Cc: [email protected]
> 
> Paul, any thoughts?

The "Fixes" tag should cover it.  But maybe Thorsten knows something that
I do not?

							Thanx, Paul