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[Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>]

This fix will included on the main kernels, so no need to track the
linux-gcp derivatives.

** No longer affects: linux-gcp (Ubuntu Xenial)

** No longer affects: linux-gcp (Ubuntu Bionic)

** No longer affects: linux-gcp (Ubuntu Cosmic)

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https://bugs.launchpad.net/bugs/1788222

Title:
  Bugfix for handling of shadow doorbell buffer

Status in linux package in Ubuntu:
  In Progress
Status in linux-gcp package in Ubuntu:
  New
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Bionic:
  In Progress
Status in linux source package in Cosmic:
  In Progress

Bug description:
  This request is to pull in the following patch for NVMe bug from
  https://lore.kernel.org/patchwork/patch/974880/ in the linux-gcp
  kernel:

  ===
  This patch adds full memory barrier into nvme_dbbuf_update_and_check_event
  function to ensure that the shadow doorbell is written before reading
  EventIdx from memory. This is a critical bugfix for initial patch that
  added support for shadow doorbell into NVMe driver[...].

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