[SRU][Q][PATCH 0/2] UBUNTU: [Config] Enable ARCH_HAVE_NMI_SAFE_CMPXCHG for riscv64

[Sarah Emery]

BugLink: https://bugs.launchpad.net/bugs/2124276

SRU Justification:

[Impact]

ftrace/kprobes tests are failing on riscv64, because of an upstream issue
that was fixed in 6.18. A configuration key was missing, that allows
the ftrace/kprobes subsystem to work correctly on riscv64.

[Fix]

Cherry picked commit 205cbc714842478df4239b5be205b9b459fd9fbc from upstream,
and added relevant config annotations bringing back feature
parity between riscv64 and other architectures around tracing subsystem.

[Test Plan]

Tested on local Q/N:linux-riscv VMs.
linux-riscv is based on Questing linux for Questing and Noble.

Executed ftrace/kprobes full test suite.

[Where problems could occur]

The now re-enabled ftrace/kprobes subsystem could have wrong behaviour. This would be low
impact as it was previously completely disabled, and now the tests are passing.

The configuration key could also affect other subsystems.

[Other Info]

This work was part of the shutdown squad effort to fix hinted tests.

Pu Lehui (1):
  riscv: Enable ARCH_HAVE_NMI_SAFE_CMPXCHG

Sarah Emery (1):
  UBUNTU: [Config] Enable ARCH_HAVE_NMI_SAFE_CMPXCHG for riscv64

 arch/riscv/Kconfig               | 1 +
 debian.master/config/annotations | 8 ++++----
 2 files changed, 5 insertions(+), 4 deletions(-)

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2.51.0