On Wed, 31 Jul 2024 08:31:11 +0530, Nysal Jan K.A. wrote:
> After the addition of HOTPLUG_SMT support for PowerPC [1] there was a
> regression reported [2] when enabling SMT. On a system with at least
> one offline core, when enabling SMT, the expectation is that no CPUs
> of offline cores are made online.
>
> On a POWER9 system with 4 cores in SMT4 mode:
> $ ppc64_cpu --info
> Core 0: 0* 1* 2* 3*
> Core 1: 4* 5* 6* 7*
> Core 2: 8* 9* 10* 11*
> Core 3: 12* 13* 14* 15*
>
> [...]
Applied to powerpc/fixes.
[1/2] cpu/SMT: Enable SMT only if a core is online
https://git.kernel.org/powerpc/c/6c17ea1f3eaa330d445ac14a9428402ce4e3055e
[2/2] powerpc/topology: Check if a core is online
https://git.kernel.org/powerpc/c/227bbaabe64b6f9cd98aa051454c1d4a194a8c6a
cheers
