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

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Date:   Mon, 23 May 2022 18:09:40 +0200
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        "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

On 20/05/2022, 18:15:39, Christophe Leroy wrote:
> 
> 
> 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.

You're right, I'll do that in the v2

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