On 02.05.19 16:34, John David Anglin wrote: > On 2019-05-02 9:43 a.m., Mikulas Patocka wrote: >> My obeservation is: >> >> CONFIG_FLATMEM_MANUAL=y - doesn't compile. With the Helge's patch, it >> compiles and works - but it only sees the first 1GiB of memory. > I didn't test FLATMEM. It should compile now if you check out the for-next branch again. And it only sees 1GiB of memory, which is correct for FLATMEM. Instead it tells you to turn on CONFIG_SPARSEMEM: [0.000000] Large gap in memory detected (786432 pages). Consider turning on CONFIG_SPARSEMEM [0.000000] Memory Ranges: [0.000000] 0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB [0.000000] Total Memory: 1024 MB .. >> CONFIG_SPARSEMEM_MANUAL=y, CONFIG_SPARSEMEM_VMEMMAP=n - works. >> CONFIG_SPARSEMEM_MANUAL=y, CONFIG_SPARSEMEM_VMEMMAP=y - hangs on boot. > I thought I selected CONFIG_SPARSEMEM_VMEMMAP but will check. Have multiple > builds with original SPARSEMEM patch that were okay. It sometimes hung for me too. I think my VMEMMAP patch overwrites other memory and thus only sometimes crashes the machine... By the way, I've rebased my for-next tree, fixed a few small issues and dropped the VMEMMAP patch for now. Please give it a new try: https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=for-next In addition I addded a for-next-testing branch for further testing of the remaining patches (VMEMMAP, JUMP_LABEL, ...). Helge
