Hi Loic, [auto build test WARNING on v4.9-rc8] [also build test WARNING on next-20170130] [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/Loic-Pallardy/virtio_rpmsg-make-rpmsg-channel-configurable/20170131-212156 config: arm-allmodconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=arm Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): In file included from arch/arm/include/asm/page.h:171:0, from arch/arm/include/asm/thread_info.h:17, from include/linux/thread_info.h:58, from include/asm-generic/preempt.h:4, from ./arch/arm/include/generated/asm/preempt.h:1, from include/linux/preempt.h:59, from include/linux/spinlock.h:50, from include/linux/seqlock.h:35, from include/linux/time.h:5, from include/linux/stat.h:18, from include/linux/module.h:10, from drivers/rpmsg/virtio_rpmsg_bus.c:23: drivers/rpmsg/virtio_rpmsg_bus.c: In function 'rpmsg_probe': >> include/asm-generic/getorder.h:17:6: warning: 'total_buf_space' may be used uninitialized in this function [-Wmaybe-uninitialized] size--; ~~~~^~ drivers/rpmsg/virtio_rpmsg_bus.c:934:9: note: 'total_buf_space' was declared here size_t total_buf_space; ^~~~~~~~~~~~~~~ In file included from drivers/rpmsg/virtio_rpmsg_bus.c:28:0: >> include/linux/dma-mapping.h:481:6: warning: 'bufs_va' may be used uninitialized in this function [-Wmaybe-uninitialized] if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/rpmsg/virtio_rpmsg_bus.c:932:8: note: 'bufs_va' was declared here void *bufs_va; ^~~~~~~ vim +/total_buf_space +17 include/asm-generic/getorder.h 5b17e1cd include/asm-generic/getorder.h Arnd Bergmann 2009-05-13 1 #ifndef __ASM_GENERIC_GETORDER_H 5b17e1cd include/asm-generic/getorder.h Arnd Bergmann 2009-05-13 2 #define __ASM_GENERIC_GETORDER_H fd4fd5aa include/asm-generic/page.h Stephen Rothwell 2005-09-03 3 fd4fd5aa include/asm-generic/page.h Stephen Rothwell 2005-09-03 4 #ifndef __ASSEMBLY__ fd4fd5aa include/asm-generic/page.h Stephen Rothwell 2005-09-03 5 38f33230 include/asm-generic/page.h Linus Torvalds 2007-03-06 6 #include <linux/compiler.h> d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 7 #include <linux/log2.h> d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 8 d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 9 /* d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 10 * Runtime evaluation of get_order() d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 11 */ d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 12 static inline __attribute_const__ d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 13 int __get_order(unsigned long size) d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 14 { d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 15 int order; d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 16 d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 @17 size--; d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 18 size >>= PAGE_SHIFT; d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 19 #if BITS_PER_LONG == 32 d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 20 order = fls(size); d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 21 #else d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 22 order = fls64(size); d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 23 #endif d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 24 return order; d66acc39 include/asm-generic/getorder.h David Howells 2012-02-20 25 } :::::: The code at line 17 was first introduced by commit :::::: d66acc39c7cee323733c8503b9de1821a56dff7e bitops: Optimise get_order() :::::: TO: David Howells <dhowells@xxxxxxxxxx> :::::: CC: H. Peter Anvin <hpa@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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