linux-kernel - Re: [PATCH v5 2/2] powerpc/rtas: Implement reentrant rtas call

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Date:   Mon, 18 May 2020 08:52:04 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Allison Randal <allison@...utok.net>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Daniel Axtens <dja@...ens.net>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Leonardo Bras <leobras.c@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nadav Amit <namit@...are.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 2/2] powerpc/rtas: Implement reentrant rtas call

Excerpts from Nicholas Piggin's message of May 16, 2020 5:36 pm:
> Excerpts from Leonardo Bras's message of May 16, 2020 3:21 pm:
>> @@ -202,6 +220,7 @@ void __init __nostackprotector initialise_paca(struct paca_struct *new_paca, int
>>  	/* For now -- if we have threads this will be adjusted later */
>>  	new_paca->tcd_ptr = &new_paca->tcd;
>>  #endif
>> +	new_paca->reentrant_args = NULL;
>>  }
>>  
>>  /* Put the paca pointer into r13 and SPRG_PACA */
>> @@ -274,6 +293,7 @@ void __init allocate_paca(int cpu)
>>  #ifdef CONFIG_PPC_BOOK3S_64
>>  	paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
>>  #endif
>> +	paca->reentrant_args = new_rtas_args(cpu, limit);
> 
> Good, I think tihs should work as you want now. Can you allocate it like 
> lppacas? Put it under PSERIES (and in the paca) and check for !HV?

Oh and while there, could you prefix the name with rtas_?

Thanks,
Nick