linux-kernel - Re: [PATCH] powerpc/603: Avoid a pile of NOPs when not using SW LRU in TLB exceptions

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Date:   Sun, 06 Jun 2021 22:08:36 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/603: Avoid a pile of NOPs when not using SW LRU in TLB exceptions

On Fri, 7 May 2021 05:02:02 +0000 (UTC), Christophe Leroy wrote:
> The SW LRU is in an MMU feature section. When not used, that's a
> dozen of NOPs to fetch for nothing.
> 
> Define an ALT section that does the few remaining operations.
> 
> That also avoids a double read on SRR1 in the SW LRU case.

Applied to powerpc/next.

[1/1] powerpc/603: Avoid a pile of NOPs when not using SW LRU in TLB exceptions
      https://git.kernel.org/powerpc/c/70d6ebf82bd0cfddaebb54e861fc15e9945a5fc6

cheers