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Date:   Mon, 18 May 2020 08:52:04 +1000
From:   Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [PATCH v5 2/2] powerpc/rtas: Implement reentrant rtas call
To:     Allison Randal <allison@lohutok.net>,
        Thiago Jung Bauermann <bauerman@linux.ibm.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Daniel Axtens <dja@axtens.net>,
        "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Anshuman Khandual <khandual@linux.vnet.ibm.com>,
        Leonardo Bras <leobras.c@gmail.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Nadav Amit <namit@vmware.com>,
        Nathan Lynch <nathanl@linux.ibm.com>,
        Paul Mackerras <paulus@samba.org>,
        Thomas Gleixner <tglx@linutronix.de>
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
References: <20200516052137.175881-1-leobras.c@gmail.com>
        <20200516052137.175881-3-leobras.c@gmail.com>
        <1589614523.yfijifo1n6.astroid@bobo.none>
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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(struc=
t paca_struct *new_paca, int
>>  	/* For now -- if we have threads this will be adjusted later */
>>  	new_paca->tcd_ptr =3D &new_paca->tcd;
>>  #endif
>> +	new_paca->reentrant_args =3D NULL;
>>  }
>> =20
>>  /* 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 =3D new_slb_shadow(cpu, limit);
>>  #endif
>> +	paca->reentrant_args =3D new_rtas_args(cpu, limit);
>=20
> Good, I think tihs should work as you want now. Can you allocate it like=20
> 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