Given this is SRU paperwork for Ubuntu linux package, moving the bug
report over to Ubuntu linux package where it belongs.

** Project changed: ubuntu-realtime => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1972899

Title:
  [Regression] Real-time Kernel Build Failure

Status in linux package in Ubuntu:
  In Progress

Bug description:
  [SRU Justification]
  A new commit in the Jammy 5.15.0-29.30 kernel is causing a build failure for 
the real-time kernel.  

  After a bisect, I found this commit is causing the real-time kernel build 
failure:
  dc66c1b8a2be1 ("x86/pkru: Remove useless include")

  Commit dc66c1b8a2be1 was added in 5.16-rc1 and not cc'd to stable.  It
  was picked into Jammy to enable AMX support.  See bug 1967750.

  The following commit resolves this regression by fixing up the includes:
  35fa745286ac4 ("x86/mm: Include spinlock_t definition in pgtable")

  Commit 35fa745286ac4 was merged into mainline 5.17-rc1.

  
  [Fix]
  35fa745286ac4 ("x86/mm: Include spinlock_t definition in pgtable")

  
  [Test case]
  Kernel builds are now working after picking this commit.

  
  [Regression potential]
  Low.  The new commit is just including a header file.

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