[llvm-dev] retpoline mitigation and 6.0

David Woodhouse via llvm-dev llvm-dev at lists.llvm.org
Fri Feb 9 04:54:53 PST 2018

On Fri, 2018-02-09 at 10:36 +0000, David Woodhouse wrote:
> Did you get anywhere with the function attribute? Having isolated the
> next boot failure to "it goes away if I compile io_apic.c without
> retpoline", bisecting it per-function would help to further delay the
> bit where I actually have to start *thinking*...

It's mp_register_ioapic(), and only when io_apic_unique_id() gets
inlined, at which point bad things start happening.

[    0.000000] mp_register_ioapic, 0 fec00000 0 c1b2fe88
[    0.000000] At line 412, gsi_base is 0
[    0.000000] At line 425, gsi_base is -1043715332
[    0.000000] At line 427, gsi_base is -1043715332



I don't *think* I screwed up copying and pasting the retpoline thunk.
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