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MIPS: init: Prevent adding memory before PHYS_OFFSET

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On some SGI machines (IP28 and IP30) a small region of memory is mirrored
to pyhsical address 0 for exception vectors while rest of the memory
is reachable at a higher physical address. ARC PROM marks this
region as reserved, but with commit a94e4f24ec ("MIPS: init: Drop
boot_mem_map") this chunk is used, when searching for start of ram,
which breaks at least IP28 and IP30 machines. To fix this
add_region_memory() checks for start address < PHYS_OFFSET and ignores
these chunks.

Fixes: a94e4f24ec ("MIPS: init: Drop boot_mem_map")
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Thomas Bogendoerfer 2019-09-24 17:20:51 +02:00 committed by Paul Burton
parent 66b416ee41
commit bd848d1b92
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GPG Key ID: 3EA79FACB57500DD
1 changed files with 3 additions and 0 deletions
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arch/mips/kernel/setup.c
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@ -108,6 +108,9 @@ void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
return;
}
if (start < PHYS_OFFSET)
return;
memblock_add(start, size);
/* Reserve any memory except the ordinary RAM ranges. */
switch (type) {