[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'
kernel test robot <[email protected]> Thu, 30 Jul 2026 02:56:52 +0200
| Newsgroups | dev.linux.lists.oe-kbuild-all |
|---|---|
| Message-ID | <[email protected]> |
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/[email protected]/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/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ 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 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki