HANG at bootup on 3.10 kernel at memset in early_alloc_aligned with CMA
mark.rutland at arm.com
Mon Oct 12 10:08:19 PDT 2015
On Mon, Oct 12, 2015 at 04:38:15PM +0000, VIKAS SAJJAN C wrote:
> we are recently migrating to 3.10 kernel on a 32bit SoC, I see that
> while boot up, the kernel HANGS in function early_alloc_aligned() at
> memset(ptr, 0, sz);
> we are reserving memory using CMA
> we have 4 banks :
> bank 1 : 0x200000000, size 0x10000000
> bank 2 : 0x300000000, size 0x10000000
> bank 3 : 0x400000000, size 0x10000000
> bank 4 : 0x500000000, size 0x0f500000
As this isn't 2M-aligned, this certainly could be the same issue.
> arm_lowmem_limit is set to 0x4f000000 and mapping is created for
> section: 20000000 ~ 4f000000
> I came across your patch "ARM: 8356/1: mm: handle non-pmd-aligned end
> of RAM"
> Was wondering whether patch is back ported to 3.10 stable branch, if
> so can you point me to the patch?
To the best of my knowledge, it was not. If you haven't seen it in the
v3.10.x commit logs, it presumably wasn't.
> if not, can you let us know the changes needed for 3.10 kernel.
I do not know. Have you tried backporting the patch?
I believe that you will also need to backport commit 3de1f52a3ae82326
("ARM: 8394/1: update memblock limit after mapping lowmem"). See [1,2].
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