sh: Provide a sane valid_phys_addr_range() to prevent TLB reset with PMB.

With the PMB enabled, only P1SEG and up are covered by the PMB mappings,
meaning that situations where out-of-bounds physical addresses are read
from will lead to TLB reset after the PMB miss, allowing for use cases
like dd if=/dev/mem to reset the TLB.

Fix this up to make sure the reference is between __MEMORY_START (phys)
and __pa(high_memory). This is coherent across all variants of sh/sh64
with and without MMU, though the PMB bug itself is only applicable to
SH-4A parts.

Reported-by: Hideo Saito <saito@densan.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/sh/mm/Makefile_64 b/arch/sh/mm/Makefile_64
index 0d92a8a3ac9..9481d0f54ef 100644
--- a/arch/sh/mm/Makefile_64
+++ b/arch/sh/mm/Makefile_64
@@ -2,7 +2,7 @@
 # Makefile for the Linux SuperH-specific parts of the memory manager.
 #
 
-obj-y			:= init.o consistent.o
+obj-y			:= init.o consistent.o mmap.o
 
 mmu-y			:= tlb-nommu.o pg-nommu.o extable_32.o
 mmu-$(CONFIG_MMU)	:= fault_64.o ioremap_64.o tlbflush_64.o tlb-sh5.o \