arm64: add DSB after icache flush in __flush_icache_all()
arm64: add DSB after icache flush in __flush_icache_all()

Add DSB after icache flush to complete the cache maintenance operation.
The function __flush_icache_all() is used only for user space mappings
and an ISB is not required because of an exception return before executing
user instructions. An exception return would behave like an ISB.

Signed-off-by: Vinayak Kale <bedf4e304e55edae1fcfe7bd202b99ffd31d0e64@apm.com>
Acked-by: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>
Cc: <4fbacc2fa0ffdbb11bf1ad6925b886ebd08dd15f@vger.kernel.org>
Signed-off-by: Catalin Marinas <15ce75b290ebaf27c3f9fd73ab848685ed3d8261@arm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs