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DSVzQaINmzjvV9s4XlpR+G238SHDHWzhrdIPalUhmIrdtYih1Ecg+MYDABMShE9i4qFxsWEZaOhmlx822pqiL5dsaYgA8t+QxYk746YHIr8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB4543 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-05_07,2023-07-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=749 suspectscore=0 spamscore=0 mlxscore=0 adultscore=0 phishscore=0 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307050139 X-Proofpoint-GUID: sqfXT74lvJ9i0IYdyL5aPqqpyPs4B9i8 X-Proofpoint-ORIG-GUID: sqfXT74lvJ9i0IYdyL5aPqqpyPs4B9i8 X-Mailman-Approved-At: Thu, 06 Jul 2023 08:04:02 +1000 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: Peter Zijlstra , Linus Walleij , Zhen Lei , "H. Peter Anvin" , WANG Xuerui , Ard Biesheuvel , tsi@tuyoix.net, Alexander Gordeev , "Paul E. McKenney" , Baoquan He , Masahiro Yamada , Konrad Rzeszutek Wilk , Sebastian Reichel , Sami Tolvanen , Miguel Ojeda , Juerg Haefliger , borntraeger@linux.ibm.com, Frederic Weisbecker , Masami Hiramatsu , Albert Ou , Kees Cook , gor@linux.ibm.com, Anshuman Khandual , Heiko Carstens , Xin Li , Nicholas Piggin , Russell King , Paul Walmsley , Boris Ostrovsky , Zi Yan , hbathini@linux.ibm.com, Greg Kroah-Hartman , "Kirill A. Shutemov" , Nick Desaulniers , sourabhjain@linux.ibm.com, Palmer Dabbelt , Sven Schnelle , Tejun Heo , Andrew Morton , Mike Rapoport Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 7/5/23 10:05, Arnd Bergmann wrote: > On Wed, Jul 5, 2023, at 16:19, Eric DeVolder wrote: >> The kexec and crash kernel options are provided in the common >> kernel/Kconfig.kexec. Utilize the common options and provide >> the ARCH_SUPPORTS_ and ARCH_SELECTS_ entries to recreate the >> equivalent set of KEXEC and CRASH options. >> >> Signed-off-by: Eric DeVolder > >> +config ARCH_SUPPORTS_KEXEC >> + def_bool (!SMP || PM_SLEEP_SMP) && MMU >> >> config ATAGS_PROC >> bool "Export atags in procfs" >> @@ -1668,17 +1656,8 @@ config ATAGS_PROC >> Should the atags used to boot the kernel be exported in an "atags" >> file in procfs. Useful with kexec. >> >> -config CRASH_DUMP >> - bool "Build kdump crash kernel (EXPERIMENTAL)" >> - help >> - Generate crash dump after being started by kexec. This should >> - be normally only set in special crash dump kernels which are >> - loaded in the main kernel with kexec-tools into a specially >> - reserved region and then later executed after a crash by >> - kdump/kexec. The crash dump kernel must be compiled to a >> - memory address not used by the main kernel >> - >> - For more details see Documentation/admin-guide/kdump/kdump.rst >> +config ARCH_SUPPORTS_CRASH_DUMP >> + def_bool y >> > > I see this is now in linux-next, and it caused a few randconfig > build issues, these never happened in the past: Arnd, Thanks for looking at this! I received randconfig errors from Andrew Morton's machinery. When investigating I found that randconfig was able to specify CRASH_DUMP without KEXEC, and that lead to problems. I believe this situation existed prior to this series as well. Specifically CRASH_DUMP does not have a dependency on KEXEC, or select (only s390 has this hole closed). For CRASH_DUMP, this series now selects KEXEC to close this gap, which is what a sane config would have (ie both CRASH_DUMP and KEXEC). Do you think the changes outlined below are still needed? eric > > * The #ifdef CONFIG_KEXEC check in arch/arm/include/asm/kexec.h > needs to be changed to CONFIG_KEXEC_CORE: > > include/linux/kexec.h:41:2: error: #error KEXEC_SOURCE_MEMORY_LIMIT not defined > > same thing on m68k > > * ARCH_SUPPORTS_CRASH_DUMP needs the same dependency as ARCH_SUPPORTS_KEXEC, > otherwise we seem to run into an obscure assembler error building the kdump > core on architectures that do not support kdump: > > /tmp/ccpYl6w9.s:1546: Error: selected processor does not support requested special purpose register -- `mrs r2,cpsr' > > * Most architectures build machine_kexec.o only when KEXEC is enabled, > this also needs to be changed to KEXEC_CORE: > > --- a/arch/arm/kernel/Makefile > +++ b/arch/arm/kernel/Makefile > @@ -59,7 +59,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += entry-ftrace.o > obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o insn.o patch.o > obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o insn.o patch.o > obj-$(CONFIG_JUMP_LABEL) += jump_label.o insn.o patch.o > -obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o > +obj-$(CONFIG_KEXEC_CORE) += machine_kexec.o relocate_kernel.o > # Main staffs in KPROBES are in arch/arm/probes/ . > obj-$(CONFIG_KPROBES) += patch.o insn.o > obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o > > > Arnd