upstream build error (11)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    4d09c1d9 Merge tag 'devicetree-fixes-for-5.10-1' of git://..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1615899c500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a5c844e56cc50cdb
dashboard link: https://syzkaller.appspot.com/bug?extid=5b0d0de84d6c65b8dd2b
compiler:       gcc (GCC) 10.1.0-syz 20200507

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5b0d0de84d6c65b8dd2b@xxxxxxxxxxxxxxxxxxxxxxxxx

mm/process_vm_access.c:277:5: error: implicit declaration of function 'in_compat_syscall'; did you mean 'in_ia32_syscall'? [-Werror=implicit-function-declaration]

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