Hi "Håkon, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on rdma/for-next] [also build test WARNING on v5.13-rc6 next-20210617] [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/H-kon-Bugge/RDMA-cma-Remove-unne... base: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next config: powerpc64-randconfig-r011-20210617 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/0day-ci/linux/commit/c0ea00a31278d0ffe083f121ddb13e27f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review H-kon-Bugge/RDMA-cma-Remove-unnecessary-INIT-INIT-transition/20210617-234819 git checkout c0ea00a31278d0ffe083f121ddb13e27f999c0a8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:249:1: note: expanded from here __do_insb ^ arch/powerpc/include/asm/io.h:556:56: note: expanded from macro '__do_insb' #define __do_insb(p, b, n) readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/infiniband/core/cma.c:14: In file included from include/linux/igmp.h:13: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:251:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:557:56: note: expanded from macro '__do_insw' #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/infiniband/core/cma.c:14: In file included from include/linux/igmp.h:13: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:253:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/infiniband/core/cma.c:14: In file included from include/linux/igmp.h:13: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:255:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/infiniband/core/cma.c:14: In file included from include/linux/igmp.h:13: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:257:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from drivers/infiniband/core/cma.c:14: In file included from include/linux/igmp.h:13: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:259:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ if (id->qp_type == IB_QPT_UD) ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/infiniband/core/cma.c:950:6: note: uninitialized use occurs here if (ret) ^~~ drivers/infiniband/core/cma.c:948:2: note: remove the 'if' if its condition is always true if (id->qp_type == IB_QPT_UD) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/infiniband/core/cma.c:933:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 14 warnings generated. vim +948 drivers/infiniband/core/cma.c e51060f08a6196 Sean Hefty 2006-06-17 927 e51060f08a6196 Sean Hefty 2006-06-17 928 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, e51060f08a6196 Sean Hefty 2006-06-17 929 struct ib_qp_init_attr *qp_init_attr) e51060f08a6196 Sean Hefty 2006-06-17 930 { e51060f08a6196 Sean Hefty 2006-06-17 931 struct rdma_id_private *id_priv; e51060f08a6196 Sean Hefty 2006-06-17 932 struct ib_qp *qp; e51060f08a6196 Sean Hefty 2006-06-17 933 int ret; e51060f08a6196 Sean Hefty 2006-06-17 934 e51060f08a6196 Sean Hefty 2006-06-17 935 id_priv = container_of(id, struct rdma_id_private, id); ed999f820a6c57 Chuck Lever 2019-12-18 936 if (id->device != pd->device) { ed999f820a6c57 Chuck Lever 2019-12-18 937 ret = -EINVAL; ed999f820a6c57 Chuck Lever 2019-12-18 938 goto out_err; ed999f820a6c57 Chuck Lever 2019-12-18 939 } e51060f08a6196 Sean Hefty 2006-06-17 940 0691a286d59183 Christoph Hellwig 2016-05-03 941 qp_init_attr->port_num = id->port_num; e51060f08a6196 Sean Hefty 2006-06-17 942 qp = ib_create_qp(pd, qp_init_attr); ed999f820a6c57 Chuck Lever 2019-12-18 943 if (IS_ERR(qp)) { ed999f820a6c57 Chuck Lever 2019-12-18 944 ret = PTR_ERR(qp); ed999f820a6c57 Chuck Lever 2019-12-18 945 goto out_err; ed999f820a6c57 Chuck Lever 2019-12-18 946 } e51060f08a6196 Sean Hefty 2006-06-17 947 b26f9b9949013f Sean Hefty 2010-04-01 @948 if (id->qp_type == IB_QPT_UD) c8f6a362bf3eb2 Sean Hefty 2007-02-15 949 ret = cma_init_ud_qp(id_priv, qp); e51060f08a6196 Sean Hefty 2006-06-17 950 if (ret) ed999f820a6c57 Chuck Lever 2019-12-18 951 goto out_destroy; e51060f08a6196 Sean Hefty 2006-06-17 952 e51060f08a6196 Sean Hefty 2006-06-17 953 id->qp = qp; e51060f08a6196 Sean Hefty 2006-06-17 954 id_priv->qp_num = qp->qp_num; e51060f08a6196 Sean Hefty 2006-06-17 955 id_priv->srq = (qp->srq != NULL); ed999f820a6c57 Chuck Lever 2019-12-18 956 trace_cm_qp_create(id_priv, pd, qp_init_attr, 0); e51060f08a6196 Sean Hefty 2006-06-17 957 return 0; ed999f820a6c57 Chuck Lever 2019-12-18 958 out_destroy: e51060f08a6196 Sean Hefty 2006-06-17 959 ib_destroy_qp(qp); ed999f820a6c57 Chuck Lever 2019-12-18 960 out_err: ed999f820a6c57 Chuck Lever 2019-12-18 961 trace_cm_qp_create(id_priv, pd, qp_init_attr, ret); e51060f08a6196 Sean Hefty 2006-06-17 962 return ret; e51060f08a6196 Sean Hefty 2006-06-17 963 } e51060f08a6196 Sean Hefty 2006-06-17 964 EXPORT_SYMBOL(rdma_create_qp); e51060f08a6196 Sean Hefty 2006-06-17 965 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org