(added Yoshinori Sato, here's the beginning of the discussion: https://lore.kernel.org/lkml/20180625140754.GB29102@xxxxxxxxxxxxxx/) On Wed, Jun 27, 2018 at 07:02:06PM +0300, Mike Rapoport wrote: > On Wed, Jun 27, 2018 at 07:33:55AM -0600, Rob Herring wrote: > > On Wed, Jun 27, 2018 at 5:27 AM Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> wrote: > > > > > > I've tried running the current upstream on h8300 gdb simulator and it > > > failed: > > > > It seems my patch[1] is still not applied. The maintainer said he applied it. > > I've applied it manually. Without it unflatten_and_copy_device_tree() fails > to allocate memory. It indeed can be fixed with moving bootmem_init() > before, as you've noted in the commit message. > > I'll try to dig deeper into it. > > > > [ 0.000000] BUG: Bad page state in process swapper pfn:00004 > > > [ 0.000000] page:007ed080 count:0 mapcount:-128 mapping:00000000 > > > index:0x0 > > > [ 0.000000] flags: 0x0() > > > [ 0.000000] raw: 00000000 0040bdac 0040bdac 00000000 00000000 00000002 > > > ffffff7f 00000000 > > > [ 0.000000] page dumped because: nonzero mapcount > > > ---Type <return> to continue, or q <return> to quit--- > > > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.18.0-rc2+ #50 > > > [ 0.000000] Stack from 00401f2c: > > > [ 0.000000] 00401f2c 001116cb 007ed080 00401f40 000e20e6 00401f54 > > > 0004df14 00000000 > > > [ 0.000000] 007ed080 007ed000 00401f5c 0004df8c 00401f90 0004e982 > > > 00000044 00401fd1 > > > [ 0.000000] 007ed000 007ed000 00000000 00000004 00000008 00000000 > > > 00000003 00000011 > > > [ 0.000000] > > > [ 0.000000] Call Trace: > > > [ 0.000000] [<000e20e6>] [<0004df14>] [<0004df8c>] [<0004e982>] > > > [ 0.000000] [<00051a28>] [<00001000>] [<00000100>] > > > [ 0.000000] Disabling lock debugging due to kernel taint > > > > > > With v4.13 I was able to get to "no valid init found". > > > > > > I had a quick look at h8300 memory initialization and it seems it has > > > starting pfn set to 0 while fdt defines memory start at 4M. > > > > Perhaps there's another issue. In my setup this is caused by __ffs() clobbering start pfn in nobootmem.c::__free_pages_memory(). If I change the __ffs() implementation from the inline assembly to generic bitops everything is fine. I'm using gcc 8.1.0 from [1] and gdb 8.1.0.20180625-git [1] http://cdn.kernel.org/pub/tools/crosstool/files/bin/x86_64/ -- Sincerely yours,
