Re: [PATCH 3/5 v0.6] sched/umcg: RFC: implement UMCG syscalls

[kernel test robot <lkp@intel.com>]

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Hi Peter,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on tip/sched/core]
[cannot apply to tip/master arnd-asm-generic/master linus/master tip/x86/asm tip/core/entry v5.15-rc2 next-20210917]
[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
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Peter-Oskolkov/sched-umcg-RFC-UMCG-patchset/20210918-020438
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 2b214a488b2c83d63c99c71d054273c1c2c07027
config: um-allmodconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/6b02b0cfe54c356b941399cacf1c752d11cc3a00
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Peter-Oskolkov/sched-umcg-RFC-UMCG-patchset/20210918-020438
        git checkout 6b02b0cfe54c356b941399cacf1c752d11cc3a00
        # save the attached .config to linux build tree
        make W=1 ARCH=um 

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

All errors (new ones prefixed by >>):

   In file included from kernel/sched/umcg.c:15:
   kernel/sched/umcg_uaccess.h: In function 'cmpxchg_user_32_nosleep':
>> kernel/sched/umcg_uaccess.h:92:2: error: implicit declaration of function '__uaccess_begin_nospec' [-Werror=implicit-function-declaration]
      92 |  __uaccess_begin_nospec();
         |  ^~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/__uaccess_begin_nospec +92 kernel/sched/umcg_uaccess.h

72323cc0a0d77f Peter Oskolkov 2021-09-17   73  
72323cc0a0d77f Peter Oskolkov 2021-09-17   74  /**
72323cc0a0d77f Peter Oskolkov 2021-09-17   75   * cmpxchg_32_user_nosleep - compare_exchange 32-bit values
72323cc0a0d77f Peter Oskolkov 2021-09-17   76   *
72323cc0a0d77f Peter Oskolkov 2021-09-17   77   * Return:
72323cc0a0d77f Peter Oskolkov 2021-09-17   78   * 0 - OK
72323cc0a0d77f Peter Oskolkov 2021-09-17   79   * -EFAULT: memory access error
72323cc0a0d77f Peter Oskolkov 2021-09-17   80   * -EAGAIN: @expected did not match; consult @prev
72323cc0a0d77f Peter Oskolkov 2021-09-17   81   */
72323cc0a0d77f Peter Oskolkov 2021-09-17   82  static inline int cmpxchg_user_32_nosleep(u32 __user *uaddr, u32 *old, u32 new)
72323cc0a0d77f Peter Oskolkov 2021-09-17   83  {
72323cc0a0d77f Peter Oskolkov 2021-09-17   84  	int ret = -EFAULT;
72323cc0a0d77f Peter Oskolkov 2021-09-17   85  	u32 __old = *old;
72323cc0a0d77f Peter Oskolkov 2021-09-17   86  
72323cc0a0d77f Peter Oskolkov 2021-09-17   87  	if (unlikely(!access_ok(uaddr, sizeof(*uaddr))))
72323cc0a0d77f Peter Oskolkov 2021-09-17   88  		return -EFAULT;
72323cc0a0d77f Peter Oskolkov 2021-09-17   89  
72323cc0a0d77f Peter Oskolkov 2021-09-17   90  	pagefault_disable();
72323cc0a0d77f Peter Oskolkov 2021-09-17   91  
72323cc0a0d77f Peter Oskolkov 2021-09-17  @92  	__uaccess_begin_nospec();
72323cc0a0d77f Peter Oskolkov 2021-09-17   93  	ret = __try_cmpxchg_user_32(old, uaddr, __old, new);
72323cc0a0d77f Peter Oskolkov 2021-09-17   94  	user_access_end();
72323cc0a0d77f Peter Oskolkov 2021-09-17   95  
72323cc0a0d77f Peter Oskolkov 2021-09-17   96  	if (!ret)
72323cc0a0d77f Peter Oskolkov 2021-09-17   97  		ret =  *old == __old ? 0 : -EAGAIN;
72323cc0a0d77f Peter Oskolkov 2021-09-17   98  
72323cc0a0d77f Peter Oskolkov 2021-09-17   99  	pagefault_enable();
72323cc0a0d77f Peter Oskolkov 2021-09-17  100  	return ret;
72323cc0a0d77f Peter Oskolkov 2021-09-17  101  }
72323cc0a0d77f Peter Oskolkov 2021-09-17  102  

---
0-DAY CI Kernel Test Service, Intel Corporation
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