On Fri, Jun 02, 2017 at 10:26:06AM +0800, zhong jiang wrote: >On 2017/6/2 9:45, Wei Yang wrote: >> On Fri, May 26, 2017 at 09:55:31AM +0800, zhong jiang wrote: >>> On 2017/5/26 9:36, Wei Yang wrote: >>>> On Thu, May 25, 2017 at 11:04:44AM +0800, zhong jiang wrote: >>>>> I hit the overlap issue, but it is hard to reproduced. if you think it is safe. and the situation >>>>> is not happen. AFAIC, it is no need to add the code. >>>>> >>>>> if you insist on the point. Maybe VM_WARN_ON is a choice. >>>>> >>>> Do you have some log to show the overlap happens? >>> Hi wei >>> >>> cat /proc/vmallocinfo >>> 0xf1580000-0xf1600000 524288 raw_dump_mem_write+0x10c/0x188 phys=8b901000 ioremap >>> 0xf1638000-0xf163a000 8192 mcss_pou_queue_init+0xa0/0x13c [mcss] phys=fc614000 ioremap >>> 0xf528e000-0xf5292000 16384 n_tty_open+0x10/0xd0 pages=3 vmalloc >>> 0xf5000000-0xf9001000 67112960 devm_ioremap+0x38/0x70 phys=40000000 ioremap >> These two ranges overlap. >> >> This is hard to say where is the problem. From the code point of view, I don't >> see there is possibility to allocate an overlapped range. >> >> Which version of your kernel? >> Hard to reproduce means just see once? > yes, just once. I have also no see any problem from the code. The kernel version is linux 4.1. > but That indeed exist. > This is really interesting. While without reproducing the behavior, it is really costly to debug in the code. I took a look into my own /proc/vmallocinfo, there are around hundred entries. Currently, I don't have a clue to dive into the issue. > Thanks >zhongjiang >>> 0xfe001000-0xfe002000 4096 iotable_init+0x0/0xc phys=20001000 ioremap >>> 0xfe200000-0xfe201000 4096 iotable_init+0x0/0xc phys=1a000000 ioremap >>> 0xff100000-0xff101000 4096 iotable_init+0x0/0xc phys=2000a000 ioremap >>> >>> I hit the above issue, but the log no more useful info. it just is found by accident. >>> and it is hard to reprodeced. no more info can be supported for further investigation. >>> therefore, it is no idea for me. >>> >>> Thanks >>> zhongjinag >>> > -- Wei Yang Help you, Help me
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