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[ARM] Fix mm initialisation with write buffered write allocate caches

It seems that without the extra tlb flush, we may end up faulting
during the early kernel initialisation because the TLB can't see
the updated page tables.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Russell King 19 năm trước cách đây
mục cha
commit
6bf7bd6967
1 tập tin đã thay đổi với 8 bổ sung1 xóa
  1. 8 1
      arch/arm/mm/init.c

+ 8 - 1
arch/arm/mm/init.c

@@ -486,10 +486,17 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
 
 	/*
 	 * Ask the machine support to map in the statically mapped devices.
-	 * After this point, we can start to touch devices again.
 	 */
 	if (mdesc->map_io)
 		mdesc->map_io();
+
+	/*
+	 * Finally flush the tlb again - this ensures that we're in a
+	 * consistent state wrt the writebuffer if the writebuffer needs
+	 * draining.  After this point, we can start to touch devices
+	 * again.
+	 */
+	local_flush_tlb_all();
 }
 
 /*