linux-kernel - Re: [PATCH] powerpc/8xx: Remove offset in SPRN_M

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Message-ID: <175764920911.610338.14934659683671395907.b4-ty@linux.ibm.com>
Date: Fri, 12 Sep 2025 09:25:55 +0530
From: Madhavan Srinivasan <maddy@...ux.ibm.com>
To: Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
        Naveen N Rao <naveen@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/8xx: Remove offset in SPRN_M_TWB

On Mon, 18 Aug 2025 11:24:22 +0200, Christophe Leroy wrote:
> SPRN_M_TWB contains the address of task PGD minus an offset which
> compensates the offset required when accessing the kernel PGDIR.
> However, since commit ac9f97ff8b32 ("powerpc/8xx: Inconditionally use
> task PGDIR in DTLB misses") and commit 33c527522f39 ("powerpc/8xx:
> Inconditionally use task PGDIR in ITLB misses") kernel PGDIR is not
> used anymore in hot pathes.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/8xx: Remove offset in SPRN_M_TWB
      https://git.kernel.org/powerpc/c/96c79fef228157baddae6574555353535772f109

Thanks