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  1. Bug #1741992
  2. Comment #5

Comment 5 for bug 1741992

Revision history for this message
bugproxy (bugproxy) wrote : [2/3] powerpc/modules: Don't try to restore r2 after a sibling call

------- Comment on attachment From <email address hidden> 2018-01-09 01:40 EDT-------

When attempting to load a livepatch module, I got the following error:

  module_64: patch_module: Expect noop after relocate, got 3c820000

The error was triggered by the following code in
unregister_netdevice_queue():

  14c: 00 00 00 48 b 14c <unregister_netdevice_queue+0x14c>
                         14c: R_PPC64_REL24 net_set_todo
  150: 00 00 82 3c addis r4,r2,0

GCC didn't insert a nop after the branch to net_set_todo() because it's
a sibling call, so it never returns. The nop isn't needed after the
branch in that case.