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Wed, 8 Apr 2020 18:01:07 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A00ADAC05B; Wed, 8 Apr 2020 18:00:56 +0000 (GMT) Received: from LeoBras (unknown [9.85.164.111]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 8 Apr 2020 18:00:55 +0000 (GMT) Message-ID: <08fd515f1e0925a9d640dffd6a97c3ddbcd0cf18.camel@linux.ibm.com> Subject: Re: [PATCH v3 1/1] ppc/crash: Reset spinlocks during crash From: Leonardo Bras To: Michael Ellerman , Nicholas Piggin , Alexios Zavras , Benjamin Herrenschmidt , Christophe Leroy , Greg Kroah-Hartman , Enrico Weigelt , Paul Mackerras , peterz@infradead.org, Thomas Gleixner Date: Wed, 08 Apr 2020 15:00:33 -0300 In-Reply-To: <87v9majhh2.fsf@mpe.ellerman.id.au> References: <20200401000020.590447-1-leonardo@linux.ibm.com> <871rp6t9di.fsf@mpe.ellerman.id.au> <02e74be19534ab1db2f16a0c89ecb164e380c12a.camel@linux.ibm.com> <1585895551.7o9oa0ey62.astroid@bobo.none> <87v9majhh2.fsf@mpe.ellerman.id.au> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-dPAT5Uf265gBn5bk+UIE" User-Agent: Evolution 3.34.4 (3.34.4-1.fc31) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.676 definitions=2020-04-07_10:2020-04-07, 2020-04-07 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 mlxscore=0 impostorscore=0 suspectscore=0 adultscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004080129 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" --=-dPAT5Uf265gBn5bk+UIE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2020-04-08 at 22:21 +1000, Michael Ellerman wrote: > We should be able to just allocate the rtas_args on the stack, it's only > ~80 odd bytes. And then we can use rtas_call_unlocked() which doesn't > take the global lock. At this point, would it be a problem using kmalloc?=20 Best regards, --=-dPAT5Uf265gBn5bk+UIE Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEMdeUgIzgjf6YmUyOlQYWtz9SttQFAl6OEUEACgkQlQYWtz9S ttRQYBAAjA9TrNO0aSybcGBUbLI3D/xxV/K5oX2uvgUE80/JxGaCtDT09vhBmu1L zf0fNtV1m6+DtbMQWeXeAexvSR5Roz1QCkYW8HEndnoavaDHn5InmBPi1iLXe3h0 1ANo9fyO0HhwNUI9I42OnnH/cKrIRsvtLHxLvLkT2oM4kFlOzfR981dR1ACDVR6M FAo1e0Dt85utw+yVvJFfWfY/Ys9H7eTrtowSRqW6GrZ2nKuWW8sgxGPuuuSv84Tn KDjMAEqaSw/JR5QEQkMfK8FzFy7h+ra8uhoA+Uasjz6tX4H142baUqjdj0n/hfXC KrJ+FuU+AHzmKoUsgP2zeT29F2Zu6ZsmjcctKSvcsHT3/hCrzp2iha0EyV1+A+oF v1s7JBEGu1smnq/6Cilw6+MLS7uktbjZQSvWbCuk+Brt9UX8dxVbPSdy3jVeao51 Dfds2Bz66ECsPZ56OCDmfUmpsQFmFhjCBL/O7BDI5yqf65b1R2KMUp2ozJUfGTIv Q8QdzdsY1RE9ED0Rcr4+zOiQWQLXwLcarsrF1DIuD58Bml8+8HpF07I9PHhs/QFh VN7wgWQh23m1sVjiMGRdMt4ofR8ZBcUCV+iP2RQewrKWFU4bPoJvai2g9YwlMPZE T4UXnRfKeuNxqktKeA02LZBTMPumazdoe/jdUy5v/clZtdC6KCM= =2bkq -----END PGP SIGNATURE----- --=-dPAT5Uf265gBn5bk+UIE--