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Fri, 21 Aug 2026 10:56:34 +0000 (GMT) Received: from li-4f5ba44c-27d4-11b2-a85c-a08f5b49eada.bl1-in.ibm.com (unknown [9.123.14.142]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 21 Aug 2026 10:56:34 +0000 (GMT) From: Sourabh Jain To: linuxppc-dev@lists.ozlabs.org Cc: Sourabh Jain , Aditya Gupta , Alexander Graf , Andrew Morton , Baoquan He , "Christophe Leroy (CS GROUP)" , Hari Bathini , Madhavan Srinivasan , Mahesh Salgaonkar , Michael Ellerman , Mike Rapoport , Nicholas Piggin , Pasha Tatashin , Pratyush Yadav , "Ritesh Harjani (IBM)" , Shivang Upadhyay , Shrikanth Hegde , kexec@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 3/3] powerpc/kho: exclude THP and HUGETLB_PAGE Date: Fri, 21 Aug 2026 16:26:09 +0530 Message-ID: <20260821105609.983622-4-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260821105609.983622-1-sourabhjain@linux.ibm.com> References: <20260821105609.983622-1-sourabhjain@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYwODIxMDA3OCBTYWx0ZWRfXxkbwyTThBDwg NELZnbNGcBIRpd43ywTbq7bJoKupsXLuf24EJdwZ7bSWUnLbl0XqUQEpeWNAr+ylQ5gBjbkzhSk KQXOVafoaF6lOSve1zqO7wXyO34+CWs= X-Proofpoint-GUID: 65iMWXvBDsxap-MDVq5bzcbcYcilH6Y0 X-Proofpoint-ORIG-GUID: kgXdKGWl4OgHoqZlAvytwn-D23Jv81Up X-Authority-Analysis: v=2.4 cv=RPmD2Yi+ c=1 sm=1 tr=0 ts=6a882eeb cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=vggBfdFIAAAA:8 a=Z4Rwk6OoAAAA:8 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=7ipKWUHlAAAA:8 a=JfrnYn6hAAAA:8 a=T6IRowXMNMGVb2OzyiIA:9 a=HkZW87K1Qel5hWWM3VKY:22 a=gpc5p9EgBqZVLdJeV_V1:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIxMDA3OCBTYWx0ZWRfX7Ej3/twDiIg8 xeqJ5OqfWnZMEeU/3ebf2BDeSNvYv4dyKtNbiUNMcLo1niBn1GYmmpbN30vqecweFOa7jZk2J4d fOskWSGhm1hpwUVYkL0Uhz9nWHsMsADvtEk0+YxfHTSax4VUjdR99nt2Sg0UGIAr2+odm5j7Xi3 r9Eo2hU8KChIFqVKE0WpZD6ljRX5E4Hw7hy/c4/c8LjDwEeZt+fvEaKaMWHN2h45MVh6QiJUvja wywQBCbdFTgqCeWW6J8R4fPa7VHMTSxF96iVPqWcUD5TlQQNjcwzkHEBOQtR7zo8fQAXICx+U1T O0kY9Ola9kJ++SLZdYbiAcPAJGZEN4zySdUUS9leNc57MN4Jzp+wVYXTVbTAjsLrwKRDcm9y9RX xyoSKClhhQ4KfMD7K838Pw43+izBzqnxG8S7MP0qgcn/P4nzcdpb3FyfN52YLg36VLB9Co2yrYA c3iHGF/Bt7SYUsutV6g== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-21_03,2026-08-21_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 adultscore=0 spamscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608210078 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260821_035657_821603_E5D1C601 X-CRM114-Status: GOOD ( 16.07 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org Enabling CONFIG_KEXEC_HANDOVER together with CONFIG_TRANSPARENT_HUGEPAGE or CONFIG_HUGETLB_PAGE on powerpc fails to build: kernel/liveupdate/kexec_handover.c:49:39: error: expression in static assertion is not constant 49 | static_assert(SCRATCH_ALIGNMENT_BYTES >= CMA_MIN_ALIGNMENT_BYTES); ./include/linux/build_bug.h:80:56: note: in definition of macro '__static_assert' 80 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg) | ^~~~ kernel/liveupdate/kexec_handover.c:49:1: note: in expansion of macro 'static_assert' 49 | static_assert(SCRATCH_ALIGNMENT_BYTES >= CMA_MIN_ALIGNMENT_BYTES); CMA_MIN_ALIGNMENT_BYTES is derived from pageblock_order, which on powerpc is not a compile-time constant when THP or HUGETLB_PAGE is enabled -- powerpc can determine huge page size at runtime in that configuration, so pageblock_order becomes a variable rather than a constant expression. KHO's static_assert() on SCRATCH_ALIGNMENT_BYTES >= CMA_MIN_ALIGNMENT_BYTES then fails to compile, since it requires both sides to be constant expressions. Until CMA_MIN_ALIGNMENT_BYTES (or KHO's use of it) is made to handle the non-constant pageblock_order case on powerpc, exclude TRANSPARENT_HUGEPAGE and HUGETLB_PAGE from ARCH_SUPPORTS_KEXEC_HANDOVER so the two can't be enabled together and hit this build failure. Cc: Aditya Gupta Cc: Alexander Graf Cc: Andrew Morton Cc: Baoquan He Cc: Christophe Leroy (CS GROUP) Cc: Hari Bathini Cc: Madhavan Srinivasan Cc: Mahesh Salgaonkar Cc: Michael Ellerman Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Pasha Tatashin Cc: Pratyush Yadav Cc: Ritesh Harjani (IBM) Cc: Shivang Upadhyay Cc: Shrikanth Hegde Cc: kexec@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Sourabh Jain --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 61350d3e7a19..f68b9fc883ba 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -720,6 +720,7 @@ config ARCH_SUPPORTS_KEXEC_HANDOVER def_bool y depends on PPC64 depends on !CRASH_DUMP + depends on !TRANSPARENT_HUGEPAGE && !HUGETLB_PAGE config ARCH_SUPPORTS_CRASH_HOTPLUG def_bool y -- 2.55.0