kernel-packages team mailing list archive

[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

Public bug reported:

The GICv3 ITS table needs between 36K and 56K of contiguous memory. But,
with 4K pages and a MAX_ZONEORDER of 11, we can only allocate 32K. The
upstream approach to resolve this will likely be to make the core GIC a
proper device that can use the DMA API:

   http://www.spinics.net/lists/arm-kernel/msg487748.html

However - that's a pretty big change, and will take a while to land.
Until that time, I propose that we bump MAX_ZONEORDER up to 13 for the
generic kernel.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: dann frazier (dannf)
         Status: Incomplete

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => dann frazier (dannf)

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https://bugs.launchpad.net/bugs/1558828

Title:
  Need enough contiguous memory to support GICv3 ITS table

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The GICv3 ITS table needs between 36K and 56K of contiguous memory.
  But, with 4K pages and a MAX_ZONEORDER of 11, we can only allocate
  32K. The upstream approach to resolve this will likely be to make the
  core GIC a proper device that can use the DMA API:

     http://www.spinics.net/lists/arm-kernel/msg487748.html

  However - that's a pretty big change, and will take a while to land.
  Until that time, I propose that we bump MAX_ZONEORDER up to 13 for the
  generic kernel.

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