IRQs disabling in flush_cache_4096 for cache purge. Under certain
workloads we would get an IRQ in the middle of a purge operation,
and the cachelines would remain in an inconsistent state, leading
to occasional stack corruption.
Signed-off-by: NTakeo Takahashi <takahashi.takeo@renesas.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>