Messages in this thread Patch in this message | | | From | Thomas Bogendoerfer <> | Subject | [PATCH] MIPS: init: Prevent adding memory before PHYS_OFFSET | Date | Tue, 24 Sep 2019 17:20:51 +0200 |
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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 a94e4f24ec83 ("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: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de> --- arch/mips/kernel/setup.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index f5c6b4c6de24..5eec13b8d222 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -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) { -- 2.13.7
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