[PATCH STABLE v4.19 0/2] Backport for "cache line starvation on x86"

[Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>]

this is a backport of commit 7aa54be297655 ("locking/qspinlock, x86:
Provide liveness guarantee") for the v4.19 stable tree.

Initially I assumed that this was merged late in v4.19-rc but actually
it is just part v4.20-rc1.

For v4.19, most things are already in the tree. The GEN_BINARY_RMWcc
macro is still "old" and I skipped the documentation update.


Sebastian