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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ae5a48ec90sm899533a91.6.2026.10.27.20.36.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Oct 2026 20:36:24 -0700 (PDT) Message-ID: Date: Wed, 28 Oct 2026 11:36:16 +0800 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/9] cpufreq: governor: Initialize kobj_type release callback statically To: Ian Rogers , Kees Cook , Greg Kroah-Hartman , Miguel Ojeda , "Rafael J . Wysocki" , Danilo Krummrich Cc: Nathan Chancellor , Nick Desaulniers , Miguel Ojeda , =?UTF-8?Q?Christian_K=C3=B6nig?= , Zhihao Cheng , Sumanth Korikkar , Bill Wendling , Justin Stitt , driver-core@lists.linux.dev, llvm@lists.linux.dev, linux-hardening@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org, linux-s390@vger.kernel.org, gfs2@lists.linux.dev, xen-devel@lists.xenproject.org, linux-mtd@lists.infradead.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Viresh Kumar , zhongqiu.han@oss.qualcomm.com References: <20261027223847.652884-1-irogers@google.com> <20261027223847.652884-5-irogers@google.com> Content-Language: en-US From: Zhongqiu Han In-Reply-To: <20261027223847.652884-5-irogers@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI4MDAxNCBTYWx0ZWRfXzR2KPx3y9Reh NIaLcj03+EtJ0r/GCRf3vtp5kmaymcHgcEQFHDF5+YF2EiPT+MSeXk44Yam3oi1hJmLI4KbWAG/ YxKUamWqHR93HveB33yMf0Y+8BPj3oYHNYZz4orYVmafK9SZP/wNkWpJ4jMrLvE9L2M0PF2mu+K ++3bohSReNZPe1SbdmQ9ITM/nUC/7vw3jTldA5nsfmW05V2DQAoVhHqYpyufP2AQjjWif9R5cGD jEN+x+Yyx+sum6BLNlsPte2WE30iUUE3GyiZxjfjhwsiemXGf/lpgksmAJ/Tc9b1fI+ewoDcpyP q/YUeHBga3RXVS1XVsgcwikPQxzroxMO+r1Q7BIFkcn77h+/tHMuTa8nCSyq18c/s7hICWaR5dj QAS99tnnJlgKZk+Jy2ysOjLniXBTeLm0I/Kz460kVP8lFKNZWaNRFBFIEGugy8veQQPri1zW7Wc /WEtzW3ycXamiSiLrVA== X-Proofpoint-GUID: scB1HNUS_NxYN7VrsAHtoAlNpcz_mnxt X-Proofpoint-ORIG-GUID: scB1HNUS_NxYN7VrsAHtoAlNpcz_mnxt X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI4MDAxNCBTYWx0ZWRfX+Rb5/DRb12CT JF+NSk8GpjHZesuOTA7fLBXE6ZHXGhaGS1KFD/7QEUnnobB30t7na9qiz5HVaBpU77kaIi9M3IF YF4YfiochEDXeoFlSwGqieNXVCrILNE= X-Authority-Analysis: v=2.4 cv=dKgzC+Zb c=1 sm=1 tr=0 ts=6ae16db9 cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=1XWaLZrsAAAA:8 a=MbyaxBA4Lnn_ULkWIDkA:9 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-28_01,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 spamscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610280014 Hi Ian, Thanks for the update. On 10/28/2026 6:38 AM, Ian Rogers wrote: > Export cpufreq_dbs_data_release() and set .kobj_type.release statically > in the ondemand and conservative governors so their gov_attr_set > kobjects have a valid release callback statically initialized, matching > cpufreq_governor_dbs. Remove the redundant runtime assignment in "matching cpufreq_governor_dbs" is a bit confusing to me (cpufreq_governor_dbs() was removed back in v4.8 by commit e788892ba3cc ("cpufreq: governor: Get rid of governor events")), as it doesn't seem to refer to anything in the tree. Perhaps we could just drop it, e.g.: Export cpufreq_dbs_data_release() and initialize .kobj_type.release statically in the ondemand and conservative governors instead of assigning it at runtime in cpufreq_dbs_governor_init(). The code change itself looks good to me. With the changelog updated (in a respin if the series needs one for other reasons, or when applying): Reviewed-by: Zhongqiu Han > cpufreq_dbs_governor_init(). > > This prepares for annotating struct kobj_type::release with > __must_init. > > Signed-off-by: Ian Rogers > --- > drivers/cpufreq/cpufreq_conservative.c | 5 ++++- > drivers/cpufreq/cpufreq_governor.c | 4 ++-- > drivers/cpufreq/cpufreq_governor.h | 1 + > drivers/cpufreq/cpufreq_ondemand.c | 5 ++++- > 4 files changed, 11 insertions(+), 4 deletions(-) > > diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c > index 02bfd46543e9..146a2353b1a2 100644 > --- a/drivers/cpufreq/cpufreq_conservative.c > +++ b/drivers/cpufreq/cpufreq_conservative.c > @@ -318,7 +318,10 @@ static void cs_limits(struct cpufreq_policy *policy) > > static struct dbs_governor cs_governor = { > .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("conservative"), > - .kobj_type = { .default_groups = cs_groups }, > + .kobj_type = { > + .release = cpufreq_dbs_data_release, > + .default_groups = cs_groups, > + }, > .gov_dbs_update = cs_dbs_update, > .alloc = cs_alloc, > .free = cs_free, > diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c > index f3bd3dbe7c41..f8b5aca09b6b 100644 > --- a/drivers/cpufreq/cpufreq_governor.c > +++ b/drivers/cpufreq/cpufreq_governor.c > @@ -419,7 +419,7 @@ static void free_policy_dbs_info(struct policy_dbs_info *policy_dbs, > gov->free(policy_dbs); > } > > -static void cpufreq_dbs_data_release(struct kobject *kobj) > +void cpufreq_dbs_data_release(struct kobject *kobj) > { > struct dbs_data *dbs_data = to_dbs_data(to_gov_attr_set(kobj)); > struct dbs_governor *gov = dbs_data->gov; > @@ -427,6 +427,7 @@ static void cpufreq_dbs_data_release(struct kobject *kobj) > gov->exit(dbs_data); > kfree(dbs_data); > } > +EXPORT_SYMBOL_GPL(cpufreq_dbs_data_release); > > int cpufreq_dbs_governor_init(struct cpufreq_policy *policy) > { > @@ -488,7 +489,6 @@ int cpufreq_dbs_governor_init(struct cpufreq_policy *policy) > policy->governor_data = policy_dbs; > > gov->kobj_type.sysfs_ops = &governor_sysfs_ops; > - gov->kobj_type.release = cpufreq_dbs_data_release; > ret = kobject_init_and_add(&dbs_data->attr_set.kobj, &gov->kobj_type, > get_governor_parent_kobj(policy), > "%s", gov->gov.name); > diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h > index 806d8fb4dff1..1026712bb79b 100644 > --- a/drivers/cpufreq/cpufreq_governor.h > +++ b/drivers/cpufreq/cpufreq_governor.h > @@ -150,6 +150,7 @@ static inline struct dbs_governor *dbs_governor_of(struct cpufreq_policy *policy > } > > /* Governor callback routines */ > +void cpufreq_dbs_data_release(struct kobject *kobj); > int cpufreq_dbs_governor_init(struct cpufreq_policy *policy); > void cpufreq_dbs_governor_exit(struct cpufreq_policy *policy); > int cpufreq_dbs_governor_start(struct cpufreq_policy *policy); > diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c > index 9942dbb38dae..7386d043c665 100644 > --- a/drivers/cpufreq/cpufreq_ondemand.c > +++ b/drivers/cpufreq/cpufreq_ondemand.c > @@ -374,7 +374,10 @@ static struct od_ops od_ops = { > > static struct dbs_governor od_dbs_gov = { > .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("ondemand"), > - .kobj_type = { .default_groups = od_groups }, > + .kobj_type = { > + .release = cpufreq_dbs_data_release, > + .default_groups = od_groups, > + }, > .gov_dbs_update = od_dbs_update, > .alloc = od_alloc, > .free = od_free, -- Thx and BRs, Zhongqiu Han