Hi Matthew, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v4.17-rc5 next-20180516] [cannot apply to target/master] [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/Matthew-Wilcox/Use-sbitmap-instead-of-percpu_ida/20180516-143658 reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__ sparse warnings: (new ones prefixed by >>) >> drivers/target/iscsi/iscsi_target_util.c:150:5: sparse: symbol 'iscsit_wait_for_tag' was not declared. Should it be static? drivers/target/iscsi/iscsi_target_util.c:1174:31: sparse: expression using sizeof(void) drivers/target/iscsi/iscsi_target_util.c:1174:31: sparse: expression using sizeof(void) Please review and possibly fold the followup patch. --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation