Hi "Joel, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [cannot apply to v5.3-rc7 next-20190903] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Joel-Fernandes-Google/pci-Convert-to-use-built-in-RCU-list-checking/20190901-211013 config: x86_64-rhel-7.6 (attached as .config) compiler: gcc-7 (Debian 7.4.0-11) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot All error/warnings (new ones prefixed by >>): ipc/sem.c: In function '__lookup_undo': >> ipc/sem.c:1856:31: error: macro "list_for_each_entry_rcu" passed 4 arguments, but takes just 3 spin_is_locked(&ulp->lock)) { ^ >> ipc/sem.c:1855:2: error: 'list_for_each_entry_rcu' undeclared (first use in this function); did you mean 'class_for_each_device'? list_for_each_entry_rcu(un, &ulp->list_proc, list_proc, ^~~~~~~~~~~~~~~~~~~~~~~ class_for_each_device ipc/sem.c:1855:2: note: each undeclared identifier is reported only once for each function it appears in >> ipc/sem.c:1856:33: error: expected ';' before '{' token spin_is_locked(&ulp->lock)) { ^ ipc/sem.c:1853:19: warning: unused variable 'un' [-Wunused-variable] struct sem_undo *un; ^~ >> ipc/sem.c:1861:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ vim +/list_for_each_entry_rcu +1856 ipc/sem.c 1850 1851 static struct sem_undo *__lookup_undo(struct sem_undo_list *ulp, int semid) 1852 { 1853 struct sem_undo *un; 1854 > 1855 list_for_each_entry_rcu(un, &ulp->list_proc, list_proc, > 1856 spin_is_locked(&ulp->lock)) { 1857 if (un->semid == semid) 1858 return un; 1859 } 1860 return NULL; > 1861 } 1862 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation