linux-kernel - Re: [PATCH] powerpc/64s: Don't read H_BLOCK

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Message-ID: <d87cca6d-8cc9-3347-f74a-28f12889cfe1@csgroup.eu>
Date:   Fri, 20 May 2022 16:15:39 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Laurent Dufour <ldufour@...ux.ibm.com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "npiggin@...il.com" <npiggin@...il.com>
CC:     "aneesh.kumar@...ux.ibm.com" <aneesh.kumar@...ux.ibm.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc/64s: Don't read H_BLOCK_REMOVE characteristics in
 radix mode



Le 20/05/2022 à 17:57, Laurent Dufour a écrit :
> There is no need to read the H_BLOCK_REMOVE characteristics when running in
> Radix mode because this hcall is never called.
> 
> Signed-off-by: Laurent Dufour <ldufour@...ux.ibm.com>
> ---
>   arch/powerpc/platforms/pseries/setup.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
> index c9fcc30a0365..654d2b999c25 100644
> --- a/arch/powerpc/platforms/pseries/setup.c
> +++ b/arch/powerpc/platforms/pseries/setup.c
> @@ -803,7 +803,8 @@ static void __init pSeries_setup_arch(void)
>   
>   	pseries_setup_security_mitigations();
>   #ifdef CONFIG_PPC_64S_HASH_MMU
> -	pseries_lpar_read_hblkrm_characteristics();
> +	if (!radix_enabled())
> +		pseries_lpar_read_hblkrm_characteristics();
>   #endif

As far as I can see the function always exists so the #ifdef can be removed.

>   
>   	/* By default, only probe PCI (can be overridden by rtas_pci) */