microblaze: Prevent the overflow of the start
[ Upstream commit 061d2c1d ] In case the start + cache size is more than the max int the start overflows. Prevent the same. Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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