Low-latency profile of StarlingX is affected by a deadlock in
CFS scheduler. spin_lock is used in IRQ handler there instead of
spin_lock_irqsave. This leads to an attempt to lock the same
spinlock twice and inevitable system freeze. Backporting c0ad4aa4d8
commit from upstream kernel to cure the issue.
Change-Id: I5416c0e0886f42d2bcec8e3e5da063e6af6916f8
Closes-bug: 1832854
Signed-off-by: Alex Kozyrev <alex.kozyrev@windriver.com>
56a91fec13