Re: [PATCH 2/7] kexec_file: print out debugging message if required

kernel test robot
2023-11-15T21:05:46Z

Hi Baoquan,

kernel test robot noticed the following build errors:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on tip/x86/core powerpc/next powerpc/fixes linus/master v6.7-rc1 next-20231115]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Baoquan-He/kexec_file-add-kexec_file-flag-to-control-debug-printing/20231114-234003
base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
patch link: https://lore.kernel.org/r/20231114153253.241262-3-bhe%40redhat.com
patch subject: [PATCH 2/7] kexec_file: print out debugging message if required
config: hexagon-comet_defconfig (https://download.01.org/0day-ci/archive/20231116/202311160431.BXPc7NO9-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231116/202311160431.BXPc7NO9-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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311160431.BXPc7NO9-lkp@intel.com/

All errors (new ones prefixed by >>):

In file included from kernel/crash_core.c:13:
In file included from include/linux/kexec.h:19:
In file included from arch/hexagon/include/asm/io.h:337:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
^
In file included from kernel/crash_core.c:13:
In file included from include/linux/kexec.h:19:
In file included from arch/hexagon/include/asm/io.h:337:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
^
In file included from kernel/crash_core.c:13:
In file included from include/linux/kexec.h:19:
In file included from arch/hexagon/include/asm/io.h:337:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
>> kernel/crash_core.c:412:3: error: call to undeclared function 'kexec_dprintk'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
kexec_dprintk("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, "
^
6 warnings and 1 error generated.

vim +/kexec_dprintk +412 kernel/crash_core.c

323
324 int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
325 void **addr, unsigned long *sz)
326 {
327 Elf64_Ehdr *ehdr;
328 Elf64_Phdr *phdr;
329 unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz;
330 unsigned char *buf;
331 unsigned int cpu, i;
332 unsigned long long notes_addr;
333 unsigned long mstart, mend;
334
335 /* extra phdr for vmcoreinfo ELF note */
336 nr_phdr = nr_cpus + 1;
337 nr_phdr += mem->nr_ranges;
338
339 /*
340 * kexec-tools creates an extra PT_LOAD phdr for kernel text mapping
341 * area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64).
342 * I think this is required by tools like gdb. So same physical
343 * memory will be mapped in two ELF headers. One will contain kernel
344 * text virtual addresses and other will have __va(physical) addresses.
345 */
346
347 nr_phdr++;
348 elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr);
349 elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
350
351 buf = vzalloc(elf_sz);
352 if (!buf)
353 return -ENOMEM;
354
355 ehdr = (Elf64_Ehdr *)buf;
356 phdr = (Elf64_Phdr *)(ehdr + 1);
357 memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
358 ehdr->e_ident[EI_CLASS] = ELFCLASS64;
359 ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
360 ehdr->e_ident[EI_VERSION] = EV_CURRENT;
361 ehdr->e_ident[EI_OSABI] = ELF_OSABI;
362 memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
363 ehdr->e_type = ET_CORE;
364 ehdr->e_machine = ELF_ARCH;
365 ehdr->e_version = EV_CURRENT;
366 ehdr->e_phoff = sizeof(Elf64_Ehdr);
367 ehdr->e_ehsize = sizeof(Elf64_Ehdr);
368 ehdr->e_phentsize = sizeof(Elf64_Phdr);
369
370 /* Prepare one phdr of type PT_NOTE for each possible CPU */
371 for_each_possible_cpu(cpu) {
372 phdr->p_type = PT_NOTE;
373 notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu));
374 phdr->p_offset = phdr->p_paddr = notes_addr;
375 phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t);
376 (ehdr->e_phnum)++;
377 phdr++;
378 }
379
380 /* Prepare one PT_NOTE header for vmcoreinfo */
381 phdr->p_type = PT_NOTE;
382 phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note();
383 phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE;
384 (ehdr->e_phnum)++;
385 phdr++;
386
387 /* Prepare PT_LOAD type program header for kernel text region */
388 if (need_kernel_map) {
389 phdr->p_type = PT_LOAD;
390 phdr->p_flags = PF_R|PF_W|PF_X;
391 phdr->p_vaddr = (unsigned long) _text;
392 phdr->p_filesz = phdr->p_memsz = _end - _text;
393 phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
394 ehdr->e_phnum++;
395 phdr++;
396 }
397
398 /* Go through all the ranges in mem->ranges[] and prepare phdr */
399 for (i = 0; i < mem->nr_ranges; i++) {
400 mstart = mem->ranges[i].start;
401 mend = mem->ranges[i].end;
402
403 phdr->p_type = PT_LOAD;
404 phdr->p_flags = PF_R|PF_W|PF_X;
405 phdr->p_offset = mstart;
406
407 phdr->p_paddr = mstart;
408 phdr->p_vaddr = (unsigned long) __va(mstart);
409 phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
410 phdr->p_align = 0;
411 ehdr->e_phnum++;
> 412 kexec_dprintk("Crash PT_LOAD ELF header. phdr=%p vaddr=0x%llx, paddr=0x%llx, "
413 "sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
414 phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
415 ehdr->e_phnum, phdr->p_offset);
416 phdr++;
417 }
418
419 *addr = buf;
420 *sz = elf_sz;
421 return 0;
422 }
423

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0-DAY CI Kernel Test Service