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The problem identified here existed before this patch series. The problem manifests because the CRASH_DUMP can be enabled without enabling KEXEC. Or perhaps stated differently, CRASH_DUMP does not select KEXEC, and so they are independent of one another, even though CRASH_DUMP clearly needs KEXEC. CONFIG_CRASH_CORE=y CONFIG_KEXEC_CORE=y # CONFIG_KEXEC is not set CONFIG_CRASH_DUMP=y In this patch series, I only sought to preserve existing behavior, which is why this problem shows here as well. This particular problem can be fixed by having CRASH_DUMP select KEXEC. Here is original CRASH_DUMP definition (notice no dependencies listed): config CRASH_DUMP bool "Build kdump crash kernel (EXPERIMENTAL)" help ... Here are three possible courses of action: - do nothing; preserve existing behavior as intended by the series (even though problems like this can occur) - fix it with CRASH_DUMP selecting KEXEC to eliminate the problem - do not fix it but document the reason why this problem occurs in the commit message Let me know if there is a preference. Thank you! eric On 7/3/23 01:31, kernel test robot wrote: > Hi Eric, > > FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable > head: f30ee81787a5abee6c7c72b0fcc30d428319c449 > commit: c717f7a0e6b98a52da146e1c09e4c5d92934ca41 [62/89] arm/kexec: refactor for kernel/Kconfig.kexec > config: arm-randconfig-r046-20230703 (https://download.01.org/0day-ci/archive/20230703/202307031404.Mjmo2JK6-lkp@intel.com/config) > compiler: arm-linux-gnueabi-gcc (GCC) 12.3.0 > reproduce: (https://download.01.org/0day-ci/archive/20230703/202307031404.Mjmo2JK6-lkp@intel.com/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-kbuild-all/202307031404.Mjmo2JK6-lkp@intel.com/ > > All errors (new ones prefixed by >>): > > In file included from drivers/misc/pvpanic/pvpanic-mmio.c:12: >>> include/linux/kexec.h:41:2: error: #error KEXEC_SOURCE_MEMORY_LIMIT not defined > 41 | #error KEXEC_SOURCE_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:45:2: error: #error KEXEC_DESTINATION_MEMORY_LIMIT not defined > 45 | #error KEXEC_DESTINATION_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:49:2: error: #error KEXEC_CONTROL_MEMORY_LIMIT not defined > 49 | #error KEXEC_CONTROL_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:57:2: error: #error KEXEC_CONTROL_PAGE_SIZE not defined > 57 | #error KEXEC_CONTROL_PAGE_SIZE not defined > | ^~~~~ >>> include/linux/kexec.h:61:2: error: #error KEXEC_ARCH not defined > 61 | #error KEXEC_ARCH not defined > | ^~~~~ > -- > In file included from kernel/panic.c:25: >>> include/linux/kexec.h:41:2: error: #error KEXEC_SOURCE_MEMORY_LIMIT not defined > 41 | #error KEXEC_SOURCE_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:45:2: error: #error KEXEC_DESTINATION_MEMORY_LIMIT not defined > 45 | #error KEXEC_DESTINATION_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:49:2: error: #error KEXEC_CONTROL_MEMORY_LIMIT not defined > 49 | #error KEXEC_CONTROL_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:57:2: error: #error KEXEC_CONTROL_PAGE_SIZE not defined > 57 | #error KEXEC_CONTROL_PAGE_SIZE not defined > | ^~~~~ >>> include/linux/kexec.h:61:2: error: #error KEXEC_ARCH not defined > 61 | #error KEXEC_ARCH not defined > | ^~~~~ > kernel/panic.c: In function '__warn': > kernel/panic.c:666:17: warning: function '__warn' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] > 666 | vprintk(args->fmt, args->args); > | ^~~~~~~ > -- > In file included from kernel/kexec_core.c:15: >>> include/linux/kexec.h:41:2: error: #error KEXEC_SOURCE_MEMORY_LIMIT not defined > 41 | #error KEXEC_SOURCE_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:45:2: error: #error KEXEC_DESTINATION_MEMORY_LIMIT not defined > 45 | #error KEXEC_DESTINATION_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:49:2: error: #error KEXEC_CONTROL_MEMORY_LIMIT not defined > 49 | #error KEXEC_CONTROL_MEMORY_LIMIT not defined > | ^~~~~ >>> include/linux/kexec.h:57:2: error: #error KEXEC_CONTROL_PAGE_SIZE not defined > 57 | #error KEXEC_CONTROL_PAGE_SIZE not defined > | ^~~~~ >>> include/linux/kexec.h:61:2: error: #error KEXEC_ARCH not defined > 61 | #error KEXEC_ARCH not defined > | ^~~~~ > kernel/kexec_core.c: In function 'sanity_check_segment_list': >>> kernel/kexec_core.c:179:29: error: 'KEXEC_DESTINATION_MEMORY_LIMIT' undeclared (first use in this function); did you mean 'KEXEC_CRASH_CONTROL_MEMORY_LIMIT'? > 179 | if (mend >= KEXEC_DESTINATION_MEMORY_LIMIT) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > | KEXEC_CRASH_CONTROL_MEMORY_LIMIT > kernel/kexec_core.c:179:29: note: each undeclared identifier is reported only once for each function it appears in > kernel/kexec_core.c: In function 'kimage_alloc_normal_control_pages': >>> kernel/kexec_core.c:388:31: error: 'KEXEC_CONTROL_MEMORY_LIMIT' undeclared (first use in this function); did you mean 'KEXEC_CONTROL_MEMORY_GFP'? > 388 | if ((epfn >= (KEXEC_CONTROL_MEMORY_LIMIT >> PAGE_SHIFT)) || > | ^~~~~~~~~~~~~~~~~~~~~~~~~~ > | KEXEC_CONTROL_MEMORY_GFP > kernel/kexec_core.c: In function 'kimage_alloc_crash_control_pages': >>> include/linux/kexec.h:65:42: error: 'KEXEC_CONTROL_MEMORY_LIMIT' undeclared (first use in this function); did you mean 'KEXEC_CONTROL_MEMORY_GFP'? > 65 | #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT > | ^~~~~~~~~~~~~~~~~~~~~~~~~~ > kernel/kexec_core.c:454:32: note: in expansion of macro 'KEXEC_CRASH_CONTROL_MEMORY_LIMIT' > 454 | if (hole_end > KEXEC_CRASH_CONTROL_MEMORY_LIMIT) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > kernel/kexec_core.c: In function 'kimage_alloc_page': >>> kernel/kexec_core.c:721:34: error: 'KEXEC_SOURCE_MEMORY_LIMIT' undeclared (first use in this function); did you mean 'KEXEC_CRASH_CONTROL_MEMORY_LIMIT'? > 721 | (KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) { > | ^~~~~~~~~~~~~~~~~~~~~~~~~ > | KEXEC_CRASH_CONTROL_MEMORY_LIMIT > kernel/kexec_core.c: In function '__crash_kexec': >>> kernel/kexec_core.c:1061:25: error: implicit declaration of function 'crash_setup_regs' [-Werror=implicit-function-declaration] > 1061 | crash_setup_regs(&fixed_regs, regs); > | ^~~~~~~~~~~~~~~~ > cc1: some warnings being treated as errors > > > vim +41 include/linux/kexec.h > > dc009d92435f99 Eric W. Biederman 2005-06-25 39 > dc009d92435f99 Eric W. Biederman 2005-06-25 40 #ifndef KEXEC_SOURCE_MEMORY_LIMIT > dc009d92435f99 Eric W. Biederman 2005-06-25 @41 #error KEXEC_SOURCE_MEMORY_LIMIT not defined > dc009d92435f99 Eric W. Biederman 2005-06-25 42 #endif > dc009d92435f99 Eric W. Biederman 2005-06-25 43 > dc009d92435f99 Eric W. Biederman 2005-06-25 44 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT > dc009d92435f99 Eric W. Biederman 2005-06-25 @45 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined > dc009d92435f99 Eric W. Biederman 2005-06-25 46 #endif > dc009d92435f99 Eric W. Biederman 2005-06-25 47 > dc009d92435f99 Eric W. Biederman 2005-06-25 48 #ifndef KEXEC_CONTROL_MEMORY_LIMIT > dc009d92435f99 Eric W. Biederman 2005-06-25 @49 #error KEXEC_CONTROL_MEMORY_LIMIT not defined > dc009d92435f99 Eric W. Biederman 2005-06-25 50 #endif > dc009d92435f99 Eric W. Biederman 2005-06-25 51 > 7e01b5acd88b3f Martin Schwidefsky 2015-04-16 52 #ifndef KEXEC_CONTROL_MEMORY_GFP > dc5cccacf4272d Russell King 2016-08-02 53 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY) > 7e01b5acd88b3f Martin Schwidefsky 2015-04-16 54 #endif > 7e01b5acd88b3f Martin Schwidefsky 2015-04-16 55 > 163f6876f5c3ff Huang Ying 2008-08-15 56 #ifndef KEXEC_CONTROL_PAGE_SIZE > 163f6876f5c3ff Huang Ying 2008-08-15 @57 #error KEXEC_CONTROL_PAGE_SIZE not defined > dc009d92435f99 Eric W. Biederman 2005-06-25 58 #endif > dc009d92435f99 Eric W. Biederman 2005-06-25 59 > dc009d92435f99 Eric W. Biederman 2005-06-25 60 #ifndef KEXEC_ARCH > dc009d92435f99 Eric W. Biederman 2005-06-25 @61 #error KEXEC_ARCH not defined > dc009d92435f99 Eric W. Biederman 2005-06-25 62 #endif > dc009d92435f99 Eric W. Biederman 2005-06-25 63 > 3d214faea6e4f9 Michael Holzheu 2011-10-30 64 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT > 3d214faea6e4f9 Michael Holzheu 2011-10-30 @65 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT > 3d214faea6e4f9 Michael Holzheu 2011-10-30 66 #endif > 3d214faea6e4f9 Michael Holzheu 2011-10-30 67 > > :::::: The code at line 41 was first introduced by commit > :::::: dc009d92435f99498cbc579ce76bf28e837e2c14 [PATCH] kexec: add kexec syscalls > > :::::: TO: Eric W. Biederman > :::::: CC: Linus Torvalds >