Re: [PATCH] kexec: allow KEXEC_HANDOVER to build with COMPILE_TEST

kernel test robot
2026-02-05T02:06:46Z

Hi Sasha,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.19-rc8 next-20260204]
[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/Sasha-Levin/kexec-allow-KEXEC_HANDOVER-to-build-with-COMPILE_TEST/20260205-023202
base: linus/master
patch link: https://lore.kernel.org/r/20260204182816.2463931-1-sashal%40kernel.org
patch subject: [PATCH] kexec: allow KEXEC_HANDOVER to build with COMPILE_TEST
config: um-allyesconfig (https://download.01.org/0day-ci/archive/20260205/202602050952.VeOX2Uoh-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260205/202602050952.VeOX2Uoh-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/202602050952.VeOX2Uoh-lkp@intel.com/

All warnings (new ones prefixed by >>):

kernel/liveupdate/kexec_handover.c: In function 'kho_fill_kimage':
kernel/liveupdate/kexec_handover.c:1547:26: error: storage size of 'scratch' isn't known
1547 | struct kexec_buf scratch;
| ^~~~~~~
kernel/liveupdate/kexec_handover.c:1552:14: error: invalid use of undefined type 'struct kimage'
1552 | image->kho.fdt = virt_to_phys(kho_out.fdt);
| ^~
kernel/liveupdate/kexec_handover.c:1556:18: error: 'struct kexec_buf' has no member named 'image'
1556 | .image = image,
| ^~~~~
>> kernel/liveupdate/kexec_handover.c:1556:26: warning: excess elements in struct initializer
1556 | .image = image,
| ^~~~~
kernel/liveupdate/kexec_handover.c:1556:26: note: (near initialization for '(anonymous)')
kernel/liveupdate/kexec_handover.c:1557:18: error: 'struct kexec_buf' has no member named 'buffer'
1557 | .buffer = kho_scratch,
| ^~~~~~
kernel/liveupdate/kexec_handover.c:1557:27: warning: excess elements in struct initializer
1557 | .buffer = kho_scratch,
| ^~~~~~~~~~~
kernel/liveupdate/kexec_handover.c:1557:27: note: (near initialization for '(anonymous)')
kernel/liveupdate/kexec_handover.c:1558:18: error: 'struct kexec_buf' has no member named 'bufsz'
1558 | .bufsz = scratch_size,
| ^~~~~
kernel/liveupdate/kexec_handover.c:1558:26: warning: excess elements in struct initializer
1558 | .bufsz = scratch_size,
| ^~~~~~~~~~~~
kernel/liveupdate/kexec_handover.c:1558:26: note: (near initialization for '(anonymous)')
kernel/liveupdate/kexec_handover.c:1559:18: error: 'struct kexec_buf' has no member named 'mem'
1559 | .mem = KEXEC_BUF_MEM_UNKNOWN,
| ^~~
kernel/liveupdate/kexec_handover.c:1559:24: error: 'KEXEC_BUF_MEM_UNKNOWN' undeclared (first use in this function)
1559 | .mem = KEXEC_BUF_MEM_UNKNOWN,
| ^~~~~~~~~~~~~~~~~~~~~
kernel/liveupdate/kexec_handover.c:1559:24: note: each undeclared identifier is reported only once for each function it appears in
kernel/liveupdate/kexec_handover.c:1559:24: warning: excess elements in struct initializer
kernel/liveupdate/kexec_handover.c:1559:24: note: (near initialization for '(anonymous)')
kernel/liveupdate/kexec_handover.c:1560:18: error: 'struct kexec_buf' has no member named 'memsz'
1560 | .memsz = scratch_size,
| ^~~~~
kernel/liveupdate/kexec_handover.c:1560:26: warning: excess elements in struct initializer
1560 | .memsz = scratch_size,
| ^~~~~~~~~~~~
kernel/liveupdate/kexec_handover.c:1560:26: note: (near initialization for '(anonymous)')
kernel/liveupdate/kexec_handover.c:1561:18: error: 'struct kexec_buf' has no member named 'buf_align'
1561 | .buf_align = SZ_64K, /* Makes it easier to map */
| ^~~~~~~~~
In file included from include/linux/mm.h:29,
from include/linux/pid_namespace.h:7,
from include/linux/ptrace.h:10,
from include/linux/elfcore.h:11,
from include/linux/vmcore_info.h:6,
from include/linux/kexec.h:18,
from kernel/liveupdate/kexec_handover.c:16:
>> include/linux/sizes.h:28:41: warning: excess elements in struct initializer
28 | #define SZ_64K 0x00010000
| ^~~~~~~~~~
kernel/liveupdate/kexec_handover.c:1561:30: note: in expansion of macro 'SZ_64K'
1561 | .buf_align = SZ_64K, /* Makes it easier to map */
| ^~~~~~
include/linux/sizes.h:28:41: note: (near initialization for '(anonymous)')
28 | #define SZ_64K 0x00010000
| ^~~~~~~~~~
kernel/liveupdate/kexec_handover.c:1561:30: note: in expansion of macro 'SZ_64K'
1561 | .buf_align = SZ_64K, /* Makes it easier to map */
| ^~~~~~
kernel/liveupdate/kexec_handover.c:1562:18: error: 'struct kexec_buf' has no member named 'buf_max'
1562 | .buf_max = ULONG_MAX,
| ^~~~~~~
In file included from include/linux/limits.h:7,
from include/linux/overflow.h:6,
from include/linux/bits.h:32,
from include/linux/bitops.h:6,
from include/linux/bitmap.h:8,
from include/linux/nodemask.h:91,
from include/linux/numa.h:6,
from include/linux/cma.h:7,
from kernel/liveupdate/kexec_handover.c:13:
>> include/vdso/limits.h:13:25: warning: excess elements in struct initializer
13 | #define ULONG_MAX (~0UL)
| ^
kernel/liveupdate/kexec_handover.c:1562:28: note: in expansion of macro 'ULONG_MAX'
1562 | .buf_max = ULONG_MAX,
| ^~~~~~~~~
include/vdso/limits.h:13:25: note: (near initialization for '(anonymous)')
13 | #define ULONG_MAX (~0UL)
| ^
kernel/liveupdate/kexec_handover.c:1562:28: note: in expansion of macro 'ULONG_MAX'
1562 | .buf_max = ULONG_MAX,
| ^~~~~~~~~
kernel/liveupdate/kexec_handover.c:1563:18: error: 'struct kexec_buf' has no member named 'top_down'
1563 | .top_down = true,
| ^~~~~~~~
kernel/liveupdate/kexec_handover.c:1563:29: warning: excess elements in struct initializer
1563 | .top_down = true,
| ^~~~
kernel/liveupdate/kexec_handover.c:1563:29: note: (near initialization for '(anonymous)')
kernel/liveupdate/kexec_handover.c:1555:37: error: invalid use of undefined type 'struct kexec_buf'
1555 | scratch = (struct kexec_buf){
| ^
kernel/liveupdate/kexec_handover.c:1565:15: error: implicit declaration of function 'kexec_add_buffer' [-Wimplicit-function-declaration]
1565 | err = kexec_add_buffer(&scratch);
| ^~~~~~~~~~~~~~~~
kernel/liveupdate/kexec_handover.c:1568:14: error: invalid use of undefined type 'struct kimage'
1568 | image->kho.scratch = &image->segment[image->nr_segments - 1];
| ^~
kernel/liveupdate/kexec_handover.c:1568:36: error: invalid use of undefined type 'struct kimage'
1568 | image->kho.scratch = &image->segment[image->nr_segments - 1];
| ^~
kernel/liveupdate/kexec_handover.c:1568:51: error: invalid use of undefined type 'struct kimage'
1568 | image->kho.scratch = &image->segment[image->nr_segments - 1];
| ^~
>> kernel/liveupdate/kexec_handover.c:1547:26: warning: unused variable 'scratch' [-Wunused-variable]
1547 | struct kexec_buf scratch;
| ^~~~~~~
kernel/liveupdate/kexec_handover.c: In function 'kho_locate_mem_hole':
kernel/liveupdate/kexec_handover.c:1599:32: error: invalid use of undefined type 'struct kexec_buf'
1599 | if (!kho_enable || kbuf->image->type == KEXEC_TYPE_CRASH)
| ^~
kernel/liveupdate/kexec_handover.c:1599:49: error: 'KEXEC_TYPE_CRASH' undeclared (first use in this function); did you mean 'KEXEC_ON_CRASH'?
1599 | if (!kho_enable || kbuf->image->type == KEXEC_TYPE_CRASH)
| ^~~~~~~~~~~~~~~~
| KEXEC_ON_CRASH

vim +1556 kernel/liveupdate/kexec_handover.c

3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1542
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1543 int kho_fill_kimage(struct kimage *image)
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1544 {
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1545 ssize_t scratch_size;
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1546 int err = 0;
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 @1547 struct kexec_buf scratch;
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1548
d7255959b69a4e kernel/liveupdate/kexec_handover.c Pasha Tatashin 2025-11-14 1549 if (!kho_enable)
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1550 return 0;
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1551
70f9133096c833 kernel/kexec_handover.c Mike Rapoport (Microsoft 2025-11-01 1552) image->kho.fdt = virt_to_phys(kho_out.fdt);
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1553
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1554 scratch_size = sizeof(*kho_scratch) * kho_scratch_cnt;
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1555 scratch = (struct kexec_buf){
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 @1556 .image = image,
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1557 .buffer = kho_scratch,
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1558 .bufsz = scratch_size,
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1559 .mem = KEXEC_BUF_MEM_UNKNOWN,
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1560 .memsz = scratch_size,
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1561 .buf_align = SZ_64K, /* Makes it easier to map */
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1562 .buf_max = ULONG_MAX,
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1563 .top_down = true,
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1564 };
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1565 err = kexec_add_buffer(&scratch);
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1566 if (err)
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1567 return err;
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 @1568 image->kho.scratch = &image->segment[image->nr_segments - 1];
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1569
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1570 return 0;
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1571 }
3bdecc3c93f9f6 kernel/kexec_handover.c Alexander Graf 2025-05-09 1572

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