Comment 6 for bug 1739498

------- Comment From <email address hidden> 2018-01-12 08:59 EDT-------
Hi,

Aneesh, right, I missed the 2 other ones. I rebuilt a kernel with the 3 patches, thanks for having thought of this, because that fixes the issue. Some details now :
actually this issue happens only when disabling RPT ("disable_radix") which is not the default in Artful.
Also I could have it on Witherspoon systems but not on Boston (having an other issue, which may hide this one... FYI the kernel loops infinitly displaying :
[ 0.000000] Allocated bitmap for 2040 MSIs (base IRQ 0x1fd000)
[ 0.000000] Initializing IODA2 PHB (/pciex@620c3c0300000)
[ 0.000000] PCI host bridge /pciex@620c3c0300000 ranges:
[ 0.0000[ 89.349426896,3] opalmsg: No available node in the free list, allocating
[ 89.352371632,3] opalmsg: No available node in the free list, allocating
00] M[ 89.355953552,3] opalmsg: No available node in the free list, allocating
[ 89.359518752,3] opalmsg: No available node in the free list, allocating
[ 89.363009568,3] opalmsg: No available node in the free list, allocating
[ 89.366608224,3] opalmsg: No available node in the free list, allocating
[ 89.370155632,3] opalmsg: No available node in the free list, allocating
[ 89.373689632,3] opalmsg: No available node in the free list, allocating
[ 89.376579088,3] opalmsg: No available node in the free list, allocating
[ 89.380134464,3] opalmsg: No available node in the free list, allocating
[ 89.383665744,3] opalmsg: No available node in the free list, allocating
[ 89.387155088,3] opalmsg: No available node in the free list, allocating
[ 89.390741040,3] opalmsg: No available node in the free list, allocating
[ 89.393600592,3] opalmsg: No available node in the free list, allocating
[ 89.397146720,3] opalmsg: No available node in the free list, allocating
[ 89.400687600,3] opalmsg: No available node in the free list, allocating
[ 89.404226032,3] opalmsg: No available node in the free list, allocating
[ 89.407772816,3] opalmsg: No available node in the free list, allocating
[ 89.410644096,3] opalmsg: No available node in the free list, allocating
....
).

So it seems those commits help :
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commit 21a0e8c14bf61472723d2acc83f98ab35ff321b4
Author: Michael Ellerman <email address hidden>
Date: Tue Aug 1 20:29:24 2017 +1000

powerpc/mm/hash64: Make vmalloc 56T on hash

commit b5048de04b32104140e5b251005404c3e0d03ccd
Author: Michael Ellerman <email address hidden>
Date: Tue Aug 1 20:29:23 2017 +1000

powerpc/mm/slb: Move comment next to the code it's referring to

commit 63ee9b2ff9d306efaa61b04b8710fafe339ae441
Author: Michael Ellerman <email address hidden>
Date: Tue Aug 1 20:29:22 2017 +1000

powerpc/mm/book3s64: Make KERN_IO_START a variable

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F.