This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1828092

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Changed in: linux (Ubuntu Disco)
       Status: New => Incomplete

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  ratelimit cma_alloc messages

Status in linux package in Ubuntu:
Status in linux source package in Disco:

Bug description:
  As described in bug 1823753, failures to allocate DMA out of CMA space can 
result in ~10K cma_alloc() error messages. While non-fatal (the code falls back 
to allocating memory out of non-CMA space), the error messages themselves can 
be a problem - esp. for systems w/ slow consoles like the HP m400 (9600 baud). 
It slows down boot so much that MAAS deploys fail due to timeout.

  [Test Case]
  Boot the disco kernel on an HP m400 or a HiSilicon D06 w/ the SMMU disabled 
in the BIOS.

  Ratelimit the messages.

  [Regression Risk]
  Minimal - we're just attempting to quiescing log spew.

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