Re: [PATCH v3 0/1] powerpc: Enable dynamic preemption

On 1/6/25 10:49, Shrikanth Hegde wrote:

Now that preempt=lazy patches[1] are in powerpc-next tree, sending out the
patch to support dynamic preemption based on DYNAMIC_KEY.

base: powerpc-next

+ankur, sebastian; sorry for not cc'ing earlier.

Once the arch supports static inline calls, it would be needed to
evaluate to see if that gives better performance.

v2->v3:
- fixed a build error reported by linux test robot by including jump
   label header.

v1->v2:
- Instead of copying asm-generic preempt.h content include it in
   arch/asm preempt.h. (Christophe Leroy)
- Merge the patches into one patch (Christophe Leroy)

v1: https://lore.kernel.org/all/20241125042212.1522315-1-sshegde@linux.ibm.com/ (local)
v2: https://lore.kernel.org/all/20250102191856.499424-1-sshegde@linux.ibm.com/ (local)
[1]: https://lore.kernel.org/all/173572211264.1875638.9927288574435880962.b4-ty@linux.ibm.com/ (local)

Shrikanth Hegde (1):
   powerpc: Enable dynamic preemption

  arch/powerpc/Kconfig               |  1 +
  arch/powerpc/include/asm/preempt.h | 12 ++++++++++++
  arch/powerpc/kernel/interrupt.c    |  6 +++++-
  arch/powerpc/kernel/traps.c        |  6 +++++-
  arch/powerpc/lib/vmx-helper.c      |  2 +-
  5 files changed, 24 insertions(+), 3 deletions(-)
  create mode 100644 arch/powerpc/include/asm/preempt.h

Hi maddy, mpe, christophe.

Now that preempt=lazy is merged upstream, is would be start to enable 
dynamic preemption to make use of all preemption models at runtime.

Are there any concerns with this patch?

Thanks.