* [mark:arm64/percpu-fixup 9/17] ./arch/arm64/include/asm/percpu.h:267:42: warning: conversion from 'long unsigned int' to 'u8' {aka 'unsigned char'} changes value from '18446744073709551615' to '255'
@ 2026-07-30 0:56 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-07-30 0:56 UTC (permalink / raw)
To: Mark Rutland; +Cc: oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/percpu-fixup
head: d1bf23b2ad173d4e8810016cbc69f2fb8f33ca93
commit: ebdcfd6d03ef8e35fb0ea95e49d0fce1ce2ec4cd [9/17] arm64: percpu: Implement preemptible read/write ops
config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260730/202607300237.brVnlEXp-lkp@intel.com/config)
compiler: aarch64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260730/202607300237.brVnlEXp-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/202607300237.brVnlEXp-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:267:42: warning: conversion from 'long unsigned int' to 'u8' {aka 'unsigned char'} changes value from '18446744073709551615' to '255' [-Woverflow]
267 | _pcp_wrap(__percpu_write_8, pcp, (unsigned long)val)
./arch/arm64/include/asm/percpu.h:249:20: note: in definition of macro '_pcp_wrap'
249 | 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:269:43: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '18446744073709551615' to '65535' [-Woverflow]
269 | _pcp_wrap(__percpu_write_16, pcp, (unsigned long)val)
./arch/arm64/include/asm/percpu.h:249:20: note: in definition of macro '_pcp_wrap'
249 | 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:271:43: warning: conversion from 'long unsigned int' to 'u32' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
271 | _pcp_wrap(__percpu_write_32, pcp, (unsigned long)val)
./arch/arm64/include/asm/percpu.h:249:20: note: in definition of macro '_pcp_wrap'
249 | 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:267:42: warning: conversion from 'long unsigned int' to 'u8' {aka 'unsigned char'} changes value from '18446744073709551615' to '255' [-Woverflow]
267 | _pcp_wrap(__percpu_write_8, pcp, (unsigned long)val)
./arch/arm64/include/asm/percpu.h:249:20: note: in definition of macro '_pcp_wrap'
249 | 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:269:43: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '18446744073709551615' to '65535' [-Woverflow]
269 | _pcp_wrap(__percpu_write_16, pcp, (unsigned long)val)
./arch/arm64/include/asm/percpu.h:249:20: note: in definition of macro '_pcp_wrap'
249 | 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:271:43: warning: conversion from 'long unsigned int' to 'u32' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
271 | _pcp_wrap(__percpu_write_32, pcp, (unsigned long)val)
./arch/arm64/include/asm/percpu.h:249:20: note: in definition of macro '_pcp_wrap'
249 | 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 +267 ./arch/arm64/include/asm/percpu.h
256
257 #define this_cpu_read_1(pcp) \
258 _pcp_wrap_return(__percpu_read_8, pcp)
259 #define this_cpu_read_2(pcp) \
260 _pcp_wrap_return(__percpu_read_16, pcp)
261 #define this_cpu_read_4(pcp) \
262 _pcp_wrap_return(__percpu_read_32, pcp)
263 #define this_cpu_read_8(pcp) \
264 _pcp_wrap_return(__percpu_read_64, pcp)
265
266 #define this_cpu_write_1(pcp, val) \
> 267 _pcp_wrap(__percpu_write_8, pcp, (unsigned long)val)
268 #define this_cpu_write_2(pcp, val) \
> 269 _pcp_wrap(__percpu_write_16, pcp, (unsigned long)val)
270 #define this_cpu_write_4(pcp, val) \
> 271 _pcp_wrap(__percpu_write_32, pcp, (unsigned long)val)
272 #define this_cpu_write_8(pcp, val) \
273 _pcp_wrap(__percpu_write_64, pcp, (unsigned long)val)
274
--
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https://github.com/intel/lkp-tests/wiki
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