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SubjectRe: [PATCH v4 3/6] uapi: futex: Add a futex syscall
Hi Alistair,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/locking/core]
[also build test ERROR on linux/master soc/for-next linus/master v5.16-rc3 next-20211203]
[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]

base: 4e0d84634445ed550498d613a49ea8f6cfa5e66c
config: i386-allyesconfig (
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
git remote add linux-review
git fetch --no-tags linux-review Alistair-Francis/perf-bench-futex-Add-support-for-32-bit-systems-with-64-bit-time_t/20211202-192015
git checkout 710fc0b1a255e93e04efbaccf76f6445db51ff1f
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All errors (new ones prefixed by >>):

In file included from <command-line>:32:
./usr/include/linux/futex_syscall.h:33:16: warning: 'struct timespec' declared inside parameter list will not be visible outside of this definition or declaration
33 | struct timespec *timeout, __volatile__ uint32_t *uaddr2, int val3)
| ^~~~~~~~
./usr/include/linux/futex_syscall.h: In function '__kernel_futex_syscall_timeout':
>> ./usr/include/linux/futex_syscall.h:36:13: error: dereferencing pointer to incomplete type 'struct timespec'
36 | if (sizeof(*timeout) != sizeof(struct __kernel_old_timespec)) {
| ^~~~~~~~
>> ./usr/include/linux/futex_syscall.h:37:13: error: implicit declaration of function 'syscall' [-Werror=implicit-function-declaration]
37 | int ret = syscall(__NR_futex_time64, uaddr, op, val, timeout, uaddr2, val3);
| ^~~~~~~
cc1: some warnings being treated as errors

0-DAY CI Kernel Test Service, Intel Corporation

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