[ARM] 5092/1: Fix the I-cache invalidation on ARMv6 and later CPUs

This patch adds the I-cache invalidation in update_mmu_cache if the
corresponding vma is marked as executable. It also invalidates the
I-cache if a thread migrates to a CPU it never ran on.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/flush.c

@@ -199,6 +199,8 @@ void flush_dcache_page(struct page *page)
 		__flush_dcache_page(mapping, page);
 		if (mapping && cache_is_vivt())
 			__flush_dcache_aliases(mapping, page);
+		else if (mapping)
+			__flush_icache_all();
 	}
 }
 EXPORT_SYMBOL(flush_dcache_page);