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Tue, 12 Jul 2022 16:50:25 +0000 (GMT) Date: Tue, 12 Jul 2022 18:49:24 +0200 From: Claudio Imbrenda To: Steffen Eiden Cc: Heiko Carstens , Alexander Gordeev , Christian Borntraeger , Janosch Frank , Vasily Gorbik , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, nrb@linux.ibm.com Subject: Re: [PATCH 3/3] s390/uvdevice: autoload module based on CPU facility Message-ID: <20220712184924.0d80c474@p-imbrenda> In-Reply-To: <20220712105220.325010-4-seiden@linux.ibm.com> References: <20220712105220.325010-1-seiden@linux.ibm.com> <20220712105220.325010-4-seiden@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 4.1.0 (GTK 3.24.34; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: c-2OtE8ICOGKMmKQh0HfTKWmO0mc4zp3 X-Proofpoint-GUID: c-2OtE8ICOGKMmKQh0HfTKWmO0mc4zp3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-12_10,2022-07-12_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 bulkscore=0 mlxscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 lowpriorityscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207120065 ARC-Authentication-Results: i=1; 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dkim=pass header.d=ibm.com header.s=pp1 header.b=G7PfpM0M; dmarc=pass (policy=none) header.from=ibm.com; spf=pass (imf10.hostedemail.com: domain of imbrenda@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=imbrenda@linux.ibm.com X-Rspam-User: X-HE-Tag: 1657644631-34702 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 12 Jul 2022 12:52:20 +0200 Steffen Eiden wrote: > Make sure the uvdevice driver will be automatically loaded when > facility 158 is available. > > Signed-off-by: Steffen Eiden > --- > arch/s390/include/asm/cpufeature.h | 1 + > arch/s390/kernel/cpufeature.c | 1 + > drivers/s390/char/uvdevice.c | 5 ++--- > 3 files changed, 4 insertions(+), 3 deletions(-) > > diff --git a/arch/s390/include/asm/cpufeature.h b/arch/s390/include/asm/cpufeature.h > index aa8081dad411..4b17f876ab54 100644 > --- a/arch/s390/include/asm/cpufeature.h > +++ b/arch/s390/include/asm/cpufeature.h > @@ -33,6 +33,7 @@ enum { > S390_CPU_FEATURE_NNPA, > S390_CPU_FEATURE_PCI_MIO, > S390_CPU_FEATURE_SIE, > + S390_CPU_FEATURE_UV, > MAX_CPU_FEATURES > }; > > diff --git a/arch/s390/kernel/cpufeature.c b/arch/s390/kernel/cpufeature.c > index e70b29804db4..0b854d37edcb 100644 > --- a/arch/s390/kernel/cpufeature.c > +++ b/arch/s390/kernel/cpufeature.c > @@ -42,6 +42,7 @@ static struct s390_cpu_feature s390_cpu_features[MAX_CPU_FEATURES] = { > [S390_CPU_FEATURE_NNPA] = {.type = TYPE_HWCAP, .num = HWCAP_NR_NNPA}, > [S390_CPU_FEATURE_PCI_MIO] = {.type = TYPE_HWCAP, .num = HWCAP_NR_PCI_MIO}, > [S390_CPU_FEATURE_SIE] = {.type = TYPE_HWCAP, .num = HWCAP_NR_SIE}, > + [S390_CPU_FEATURE_UV] = {.type = TYPE_FACILITY, .num = 158}, > }; > > /* > diff --git a/drivers/s390/char/uvdevice.c b/drivers/s390/char/uvdevice.c > index 66505d7166a6..1d40457c7b10 100644 > --- a/drivers/s390/char/uvdevice.c > +++ b/drivers/s390/char/uvdevice.c > @@ -27,6 +27,7 @@ > #include > #include > #include > +#include > > #include > #include > @@ -244,12 +245,10 @@ static void __exit uvio_dev_exit(void) > > static int __init uvio_dev_init(void) > { > - if (!test_facility(158)) > - return -ENXIO; > return misc_register(&uvio_dev_miscdev); > } > > -module_init(uvio_dev_init); > +module_cpu_feature_match(S390_CPU_FEATURE_UV, uvio_dev_init); does this still prevent manual loading when the feature is not present? > module_exit(uvio_dev_exit); > > MODULE_AUTHOR("IBM Corporation");