From: kernel test robot <lkp@intel.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: oe-kbuild-all@lists.linux.dev
Subject: [mark:arm64/percpu-fixup 11/17] arch/arm64/include/asm/percpu.h:278:42: warning: conversion from 'long unsigned int' to 'u8' {aka 'unsigned char'} changes value from '18446744073709551615' to '255'
Date: Sat, 01 Aug 2026 17:41:55 +0800 [thread overview]
Message-ID: <202608011641.dj2IIpnP-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/percpu-fixup
head: f14d3c444eacd9a722e55ff59e30cce2b1ac8985
commit: 55cddf3387a963a59fa5f7e0df28d64fc2d8aa51 [11/17] arm64: percpu: Implement preemptible read/write ops
config: arm64-randconfig-003-20260801 (https://download.01.org/0day-ci/archive/20260801/202608011641.dj2IIpnP-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260801/202608011641.dj2IIpnP-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/202608011641.dj2IIpnP-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from arch/arm64/include/asm/spectre.h:17,
from arch/arm64/include/asm/processor.h:47,
from include/linux/sched.h:13,
from include/linux/ratelimit.h:6,
from include/linux/dev_printk.h:16,
from include/linux/device.h:15,
from include/linux/node.h:18,
from include/linux/cpu.h:17,
from include/linux/stop_machine.h:5,
from kernel/trace/ftrace.c:17:
kernel/trace/ftrace.c: In function 'ftrace_filter_pid_sched_switch_probe':
>> arch/arm64/include/asm/percpu.h:278:42: warning: conversion from 'long unsigned int' to 'u8' {aka 'unsigned char'} changes value from '18446744073709551615' to '255' [-Woverflow]
278 | _pcp_wrap(__percpu_write_8, pcp, (unsigned long)val)
arch/arm64/include/asm/percpu.h:260:20: note: in definition of macro '_pcp_wrap'
260 | op(&(pcp), __VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/percpu-defs.h:369:25: note: in expansion of macro 'this_cpu_write_1'
369 | case 1: stem##1(variable, __VA_ARGS__);break; \
| ^~~~
include/linux/percpu-defs.h:500:41: note: in expansion of macro '__pcpu_size_call'
500 | #define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
| ^~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:8628:17: note: in expansion of macro 'this_cpu_write'
8628 | this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
| ^~~~~~~~~~~~~~
>> arch/arm64/include/asm/percpu.h:280:43: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '18446744073709551615' to '65535' [-Woverflow]
280 | _pcp_wrap(__percpu_write_16, pcp, (unsigned long)val)
arch/arm64/include/asm/percpu.h:260:20: note: in definition of macro '_pcp_wrap'
260 | op(&(pcp), __VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/percpu-defs.h:370:25: note: in expansion of macro 'this_cpu_write_2'
370 | case 2: stem##2(variable, __VA_ARGS__);break; \
| ^~~~
include/linux/percpu-defs.h:500:41: note: in expansion of macro '__pcpu_size_call'
500 | #define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
| ^~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:8628:17: note: in expansion of macro 'this_cpu_write'
8628 | this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
| ^~~~~~~~~~~~~~
>> arch/arm64/include/asm/percpu.h:282:43: warning: conversion from 'long unsigned int' to 'u32' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
282 | _pcp_wrap(__percpu_write_32, pcp, (unsigned long)val)
arch/arm64/include/asm/percpu.h:260:20: note: in definition of macro '_pcp_wrap'
260 | op(&(pcp), __VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/percpu-defs.h:371:25: note: in expansion of macro 'this_cpu_write_4'
371 | case 4: stem##4(variable, __VA_ARGS__);break; \
| ^~~~
include/linux/percpu-defs.h:500:41: note: in expansion of macro '__pcpu_size_call'
500 | #define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
| ^~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:8628:17: note: in expansion of macro 'this_cpu_write'
8628 | this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
| ^~~~~~~~~~~~~~
kernel/trace/ftrace.c: In function 'ignore_task_cpu':
>> arch/arm64/include/asm/percpu.h:278:42: warning: conversion from 'long unsigned int' to 'u8' {aka 'unsigned char'} changes value from '18446744073709551615' to '255' [-Woverflow]
278 | _pcp_wrap(__percpu_write_8, pcp, (unsigned long)val)
arch/arm64/include/asm/percpu.h:260:20: note: in definition of macro '_pcp_wrap'
260 | op(&(pcp), __VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/percpu-defs.h:369:25: note: in expansion of macro 'this_cpu_write_1'
369 | case 1: stem##1(variable, __VA_ARGS__);break; \
| ^~~~
include/linux/percpu-defs.h:500:41: note: in expansion of macro '__pcpu_size_call'
500 | #define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
| ^~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:8898:17: note: in expansion of macro 'this_cpu_write'
8898 | this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
| ^~~~~~~~~~~~~~
>> arch/arm64/include/asm/percpu.h:280:43: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '18446744073709551615' to '65535' [-Woverflow]
280 | _pcp_wrap(__percpu_write_16, pcp, (unsigned long)val)
arch/arm64/include/asm/percpu.h:260:20: note: in definition of macro '_pcp_wrap'
260 | op(&(pcp), __VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/percpu-defs.h:370:25: note: in expansion of macro 'this_cpu_write_2'
370 | case 2: stem##2(variable, __VA_ARGS__);break; \
| ^~~~
include/linux/percpu-defs.h:500:41: note: in expansion of macro '__pcpu_size_call'
500 | #define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
| ^~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:8898:17: note: in expansion of macro 'this_cpu_write'
8898 | this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
| ^~~~~~~~~~~~~~
>> arch/arm64/include/asm/percpu.h:282:43: warning: conversion from 'long unsigned int' to 'u32' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
282 | _pcp_wrap(__percpu_write_32, pcp, (unsigned long)val)
arch/arm64/include/asm/percpu.h:260:20: note: in definition of macro '_pcp_wrap'
260 | op(&(pcp), __VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/percpu-defs.h:371:25: note: in expansion of macro 'this_cpu_write_4'
371 | case 4: stem##4(variable, __VA_ARGS__);break; \
| ^~~~
include/linux/percpu-defs.h:500:41: note: in expansion of macro '__pcpu_size_call'
500 | #define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
| ^~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:8898:17: note: in expansion of macro 'this_cpu_write'
8898 | this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
| ^~~~~~~~~~~~~~
vim +278 arch/arm64/include/asm/percpu.h
267
268 #define this_cpu_read_1(pcp) \
269 _pcp_wrap_return(__percpu_read_8, pcp)
270 #define this_cpu_read_2(pcp) \
271 _pcp_wrap_return(__percpu_read_16, pcp)
272 #define this_cpu_read_4(pcp) \
273 _pcp_wrap_return(__percpu_read_32, pcp)
274 #define this_cpu_read_8(pcp) \
275 _pcp_wrap_return(__percpu_read_64, pcp)
276
277 #define this_cpu_write_1(pcp, val) \
> 278 _pcp_wrap(__percpu_write_8, pcp, (unsigned long)val)
279 #define this_cpu_write_2(pcp, val) \
> 280 _pcp_wrap(__percpu_write_16, pcp, (unsigned long)val)
281 #define this_cpu_write_4(pcp, val) \
> 282 _pcp_wrap(__percpu_write_32, pcp, (unsigned long)val)
283 #define this_cpu_write_8(pcp, val) \
284 _pcp_wrap(__percpu_write_64, pcp, (unsigned long)val)
285
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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