linux-kernel - Re: [PATCH v2 1/2] cpu/SMT: Enable SMT only if a core is online

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Message-ID: <87r0b96el8.ffs@tglx>
Date: Wed, 31 Jul 2024 12:27:47 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: "Nysal Jan K.A." <nysal@...ux.ibm.com>, Michael Ellerman
 <mpe@...erman.id.au>
Cc: Tyrel Datwyler <tyreld@...ux.ibm.com>, Michal Suchanek
 <msuchanek@...e.de>, "Nysal Jan K.A" <nysal@...ux.ibm.com>, Nicholas
 Piggin <npiggin@...il.com>, Christophe Leroy
 <christophe.leroy@...roup.eu>, "Naveen N. Rao"
 <naveen.n.rao@...ux.ibm.com>, Peter Zijlstra <peterz@...radead.org>, Pawan
 Gupta <pawan.kumar.gupta@...ux.intel.com>, Ard Biesheuvel
 <ardb@...nel.org>, Eric DeVolder <eric.devolder@...cle.com>, Sourabh Jain
 <sourabhjain@...ux.ibm.com>, Stephen Rothwell <sfr@...b.auug.org.au>,
 Laurent Dufour <ldufour@...ux.ibm.com>, linux-kernel@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 1/2] cpu/SMT: Enable SMT only if a core is online

On Wed, Jul 31 2024 at 08:31, Nysal Jan K. A. wrote:
> If the user has decided to offline certain cores, enabling SMT should
> not online CPUs in those cores. This patch fixes the issue and changes
> the behaviour as described, by introducing an arch specific function
> topology_is_core_online(). It is currently implemented only for PowerPC.
>
> Fixes: 73c58e7e1412 ("powerpc: Add HOTPLUG_SMT support")
> Reported-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
> Closes: https://groups.google.com/g/powerpc-utils-devel/c/wrwVzAAnRlI/m/5KJSoqP4BAAJ
> Signed-off-by: Nysal Jan K.A <nysal@...ux.ibm.com>

Assuming this goes through the PPC tree:

  Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

Michael: If I should route it through my tree, let me know.

Thanks,

        tglx