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 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'
Date: Thu, 30 Jul 2026 02:56:52 +0200 [thread overview]
Message-ID: <202607300237.brVnlEXp-lkp@intel.com> (raw)
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
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-07-30 0:57 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202607300237.brVnlEXp-lkp@intel.com \
--to=lkp@intel.com \
--cc=mark.rutland@arm.com \
--cc=oe-kbuild-all@lists.linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.