linux-kernel - Re: [PATCH] powerpc/fsl_booke: avoid creating duplicate tlb1 entry

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Message-ID: <498ce16efb7784d95569d000bfab33ae25b823bd.camel@buserror.net>
Date:   Sat, 29 Feb 2020 17:09:22 -0600
From:   Scott Wood <oss@...error.net>
To:     Laurentiu Tudor <laurentiu.tudor@....com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>
Cc:     "christophe.leroy@....fr" <christophe.leroy@....fr>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Diana Madalina Craciun <diana.craciun@....com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] powerpc/fsl_booke: avoid creating duplicate tlb1 entry

On Thu, 2020-01-23 at 11:19 +0000, Laurentiu Tudor wrote:
> In the current implementation, the call to loadcam_multi() is wrapped
> between switch_to_as1() and restore_to_as0() calls so, when it tries
> to create its own temporary AS=1 TLB1 entry, it ends up duplicating the
> existing one created by switch_to_as1(). Add a check to skip creating
> the temporary entry if already running in AS=1.
> 
> Fixes: d9e1831a4202 ("powerpc/85xx: Load all early TLB entries at once")
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> Cc: stable@...r.kernel.org
> ---
>  arch/powerpc/mm/nohash/tlb_low.S | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)

Assuming you've tested this on all combinations of 32/64 relocatable and not:

Acked-by: Scott Wood <oss@...error.net>

-Scott