Re: linux-next: build failure after merge of the mm tree

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The build problem has been reproduced and solved in v27. Specifically the builds that fail are because only PROC_KCORE has been set, which only enables CRASH_CORE by itself. I had to move a few items to obtain the needed visibility.

"[PATCH v27 0/8] crash: Kernel handling of CPU and memory hot un/plug"
https://lore.kernel.org/lkml/20230811170642.6696-1-eric.devolder@xxxxxxxxxx/

In addition, I've spot tested/built a few other architectures and do not encounter build errors.

Thanks!
eric

On 8/7/23 23:40, Stephen Rothwell wrote:
Hi all,

After merging the mm tree, today's linux-next build (powerpc
ppc44x_defconfig) failed like this:

In file included from kernel/crash_core.c:23:
kernel/kexec_internal.h:11:54: warning: 'struct kexec_segment' declared inside parameter list will not be visible outside of this definition or declaration
    11 | int kimage_load_segment(struct kimage *image, struct kexec_segment *segment);
       |                                                      ^~~~~~~~~~~~~
kernel/crash_core.c:321:40: warning: 'struct crash_mem' declared inside parameter list will not be visible outside of this definition or declaration
   321 | int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
       |                                        ^~~~~~~~~
kernel/crash_core.c: In function 'crash_prepare_elf64_headers':
kernel/crash_core.c:334:23: error: invalid use of undefined type 'struct crash_mem'
   334 |         nr_phdr += mem->nr_ranges;
       |                       ^~
In file included from include/vdso/const.h:5,
                  from include/linux/const.h:4,
                  from include/linux/bits.h:5,
                  from include/linux/ratelimit_types.h:5,
                  from include/linux/printk.h:9,
                  from include/asm-generic/bug.h:22,
                  from arch/powerpc/include/asm/bug.h:116,
                  from include/linux/bug.h:5,
                  from arch/powerpc/include/asm/cmpxchg.h:8,
                  from arch/powerpc/include/asm/atomic.h:11,
                  from include/linux/atomic.h:7,
                  from include/linux/mm_types_task.h:13,
                  from include/linux/mm_types.h:5,
                  from include/linux/buildid.h:5,
                  from kernel/crash_core.c:7:
kernel/crash_core.c:346:32: error: 'ELF_CORE_HEADER_ALIGN' undeclared (first use in this function)
   346 |         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
       |                                ^~~~~~~~~~~~~~~~~~~~~
include/uapi/linux/const.h:32:50: note: in definition of macro '__ALIGN_KERNEL_MASK'
    32 | #define __ALIGN_KERNEL_MASK(x, mask)    (((x) + (mask)) & ~(mask))
       |                                                  ^~~~
include/linux/align.h:8:33: note: in expansion of macro '__ALIGN_KERNEL'
     8 | #define ALIGN(x, a)             __ALIGN_KERNEL((x), (a))
       |                                 ^~~~~~~~~~~~~~
kernel/crash_core.c:346:18: note: in expansion of macro 'ALIGN'
   346 |         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
       |                  ^~~~~
kernel/crash_core.c:346:32: note: each undeclared identifier is reported only once for each function it appears in
   346 |         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
       |                                ^~~~~~~~~~~~~~~~~~~~~
include/uapi/linux/const.h:32:50: note: in definition of macro '__ALIGN_KERNEL_MASK'
    32 | #define __ALIGN_KERNEL_MASK(x, mask)    (((x) + (mask)) & ~(mask))
       |                                                  ^~~~
include/linux/align.h:8:33: note: in expansion of macro '__ALIGN_KERNEL'
     8 | #define ALIGN(x, a)             __ALIGN_KERNEL((x), (a))
       |                                 ^~~~~~~~~~~~~~
kernel/crash_core.c:346:18: note: in expansion of macro 'ALIGN'
   346 |         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
       |                  ^~~~~
kernel/crash_core.c:396:28: error: invalid use of undefined type 'struct crash_mem'
   396 |         for (i = 0; i < mem->nr_ranges; i++) {
       |                            ^~
kernel/crash_core.c:397:29: error: invalid use of undefined type 'struct crash_mem'
   397 |                 mstart = mem->ranges[i].start;
       |                             ^~
kernel/crash_core.c:398:27: error: invalid use of undefined type 'struct crash_mem'
   398 |                 mend = mem->ranges[i].end;
       |                           ^~
kernel/crash_core.c: At top level:
kernel/crash_core.c:420:36: warning: 'struct crash_mem' declared inside parameter list will not be visible outside of this definition or declaration
   420 | int crash_exclude_mem_range(struct crash_mem *mem,
       |                                    ^~~~~~~~~
kernel/crash_core.c: In function 'crash_exclude_mem_range':
kernel/crash_core.c:427:28: error: invalid use of undefined type 'struct crash_mem'
   427 |         for (i = 0; i < mem->nr_ranges; i++) {
       |                            ^~
kernel/crash_core.c:428:28: error: invalid use of undefined type 'struct crash_mem'
   428 |                 start = mem->ranges[i].start;
       |                            ^~
kernel/crash_core.c:429:26: error: invalid use of undefined type 'struct crash_mem'
   429 |                 end = mem->ranges[i].end;
       |                          ^~
kernel/crash_core.c:444:28: error: invalid use of undefined type 'struct crash_mem'
   444 |                         mem->ranges[i].start = 0;
       |                            ^~
kernel/crash_core.c:445:28: error: invalid use of undefined type 'struct crash_mem'
   445 |                         mem->ranges[i].end = 0;
       |                            ^~
kernel/crash_core.c:446:36: error: invalid use of undefined type 'struct crash_mem'
   446 |                         if (i < mem->nr_ranges - 1) {
       |                                    ^~
kernel/crash_core.c:448:52: error: invalid use of undefined type 'struct crash_mem'
   448 |                                 for (j = i; j < mem->nr_ranges - 1; j++) {
       |                                                    ^~
kernel/crash_core.c:449:44: error: invalid use of undefined type 'struct crash_mem'
   449 |                                         mem->ranges[j].start =
       |                                            ^~
kernel/crash_core.c:450:52: error: invalid use of undefined type 'struct crash_mem'
   450 |                                                 mem->ranges[j+1].start;
       |                                                    ^~
kernel/crash_core.c:451:44: error: invalid use of undefined type 'struct crash_mem'
   451 |                                         mem->ranges[j].end =
       |                                            ^~
kernel/crash_core.c:452:60: error: invalid use of undefined type 'struct crash_mem'
   452 |                                                         mem->ranges[j+1].end;
       |                                                            ^~
kernel/crash_core.c:461:36: error: invalid use of undefined type 'struct crash_mem'
   461 |                                 mem->nr_ranges--;
       |                                    ^~
kernel/crash_core.c:464:28: error: invalid use of undefined type 'struct crash_mem'
   464 |                         mem->nr_ranges--;
       |                            ^~
kernel/crash_core.c:470:28: error: invalid use of undefined type 'struct crash_mem'
   470 |                         mem->ranges[i].end = p_start - 1;
       |                            ^~
kernel/crash_core.c:474:28: error: invalid use of undefined type 'struct crash_mem'
   474 |                         mem->ranges[i].end = p_start - 1;
       |                            ^~
kernel/crash_core.c:476:28: error: invalid use of undefined type 'struct crash_mem'
   476 |                         mem->ranges[i].start = p_end + 1;
       |                            ^~
kernel/crash_core.c:485:21: error: invalid use of undefined type 'struct crash_mem'
   485 |         if (i == mem->max_nr_ranges - 1)
       |                     ^~
kernel/crash_core.c:490:20: error: invalid use of undefined type 'struct crash_mem'
   490 |         if (j < mem->nr_ranges) {
       |                    ^~
kernel/crash_core.c:492:29: error: invalid use of undefined type 'struct crash_mem'
   492 |                 for (i = mem->nr_ranges - 1; i >= j; i--)
       |                             ^~
kernel/crash_core.c:493:28: error: invalid use of undefined type 'struct crash_mem'
   493 |                         mem->ranges[i + 1] = mem->ranges[i];
       |                            ^~
kernel/crash_core.c:493:49: error: invalid use of undefined type 'struct crash_mem'
   493 |                         mem->ranges[i + 1] = mem->ranges[i];
       |                                                 ^~
kernel/crash_core.c:496:12: error: invalid use of undefined type 'struct crash_mem'
   496 |         mem->ranges[j].start = temp_range.start;
       |            ^~
kernel/crash_core.c:497:12: error: invalid use of undefined type 'struct crash_mem'
   497 |         mem->ranges[j].end = temp_range.end;
       |            ^~
kernel/crash_core.c:498:12: error: invalid use of undefined type 'struct crash_mem'
   498 |         mem->nr_ranges++;
       |            ^~

I am not sure exactly which commit caused but I have revreted these
for today:

   6a41fd4665e6 ("x86/crash: optimize CPU changes")
   add3b7e011e9 ("crash: change crash_prepare_elf64_headers() to for_each_possible_cpu()")
   4a7eed40a7bc ("crash: hotplug support for kexec_load()")
   8ce41bc6b147 ("x86/crash: add x86 crash hotplug support")
   2b765af0c14f ("crash: memory and CPU hotplug sysfs attributes")
   36d2b573329b ("kexec: exclude elfcorehdr from the segment digest")
   ccfe0040500f ("crash: add generic infrastructure for crash hotplug support")
   626775922a57 ("crash: move a few code bits to setup support of crash hotplug")




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