[SRU][Jammy][PATCH 0/1] Fix for LP:1972899 generic kernel

[Joseph Salisbury]

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

[SRU Justification]
A new commit in the Jammy 5.15.0-29.30 kernel is causing a build failure
for the real-time kernel and may affect other derivatives.

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 LP: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.

This commit was already requested for the real-time kernel.  However,
we should also include it in the generic kernel to prevent other 
codebases from hitting this issue.


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

[Test case]
Real-time kernel builds are now working after picking this commit.

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

Sebastian Andrzej Siewior (1):
  x86/mm: Include spinlock_t definition in pgtable.

 arch/x86/include/asm/pgtable.h | 1 +
 1 file changed, 1 insertion(+)

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