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Wed, 15 Nov 2023 08:09:56 +0000 (GMT) Received: from skywalker.linux.ibm.com (unknown [9.43.109.250]) by smtpav03.wdc07v.mail.ibm.com (Postfix) with ESMTP; Wed, 15 Nov 2023 08:09:56 +0000 (GMT) X-Mailer: emacs 29.1 (via feedmail 11-beta-1 I) From: "Aneesh Kumar K.V" To: Vishal Chourasia , linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH] powerpc: Restrict ARCH_HIBERNATION_POSSIBLE to supported configurations In-Reply-To: <20231114082046.6018-1-vishalc@linux.ibm.com> References: <20231114082046.6018-1-vishalc@linux.ibm.com> Date: Wed, 15 Nov 2023 13:39:54 +0530 Message-ID: <87sf57zbcd.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-GUID: qscIRIBxlkqFW7-M11YxbqvaMI4o50yO X-Proofpoint-ORIG-GUID: qscIRIBxlkqFW7-M11YxbqvaMI4o50yO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-15_07,2023-11-14_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 phishscore=0 clxscore=1015 priorityscore=1501 mlxscore=0 spamscore=0 mlxlogscore=785 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311150059 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: Vishal Chourasia Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Vishal Chourasia writes: > This patch modifies the ARCH_HIBERNATION_POSSIBLE option to ensure that it > correctly depends on these PowerPC configurations being enabled. As a result, > it prevents the HOTPLUG_CPU from being selected when the required dependencies > are not satisfied. > > This change aligns the dependency tree with the expected hardware support for > CPU hot-plugging under PowerPC architectures, ensuring that the kernel > configuration steps do not lead to inconsistent states. > > Signed-off-by: Vishal Chourasia > --- > During the configuration process with 'make randconfig' followed by > 'make olddefconfig', we observed a warning indicating an unmet direct > dependency for the HOTPLUG_CPU option. The dependency in question relates to > various PowerPC configurations (PPC_PSERIES, PPC_PMAC, PPC_POWERNV, > FSL_SOC_BOOKE) which were not enabled, yet the HOTPLUG_CPU was being > erroneously selected due to an implicit assumption by the PM_SLEEP_SMP option. > This misalignment in dependencies could potentially lead to inconsistent kernel > configuration states, especially when considering the necessary hardware > support for CPU hot-plugging on PowerPC platforms. The patch aims to correct > this by ensuring that ARCH_HIBERNATION_POSSIBLE is contingent upon the > appropriate PowerPC configurations being active. > > steps to reproduce (before applying the patch): > > Run 'make pseries_le_defconfig' > Run 'make menuconfig' > Enable hibernation [ Kernel options -> Hibernation (aka 'suspend to disk') ] > Disable [ Platform support -> IBM PowerNV (Non-Virtualized) platform support ] > Disable [ Platform support -> IBM pSeries & new (POWER5-based) iSeries ] > Enable SMP [ Processor support -> Symmetric multi-processing support ] > Save the config > Run 'make olddefconfig' > > arch/powerpc/Kconfig | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 6f105ee4f3cf..bf99ff9869f6 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -380,8 +380,9 @@ config DEFAULT_UIMAGE > Used to allow a board to specify it wants a uImage built by default > > config ARCH_HIBERNATION_POSSIBLE > - bool > - default y > + def_bool y > + depends on PPC_PSERIES || \ > + PPC_PMAC || PPC_POWERNV || FSL_SOC_BOOKE > > config ARCH_SUSPEND_POSSIBLE > def_bool y > I am wondering whether it should be switched to using select from config PPC? -aneesh