Hi Markus, [auto build test WARNING on s390/features] [also build test WARNING on v4.10-rc4 next-20170120] [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/SF-Markus-Elfring/s390-pci-Fine-tuning-for-three-function-implementations/20170122-021955 base: https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features config: s390-allmodconfig (attached as .config) compiler: s390x-linux-gnu-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=s390 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 >>): arch/s390/pci/pci_clp.c: In function 'clp_misc_ioctl': >> arch/s390/pci/pci_clp.c:543:5: warning: 'rc' may be used uninitialized in this function [-Wmaybe-uninitialized] if (rc) ^ arch/s390/pci/pci_clp.c:515:6: note: 'rc' was declared here int rc; ^~ vim +/rc +543 arch/s390/pci/pci_clp.c 988b86e69 Martin Schwidefsky 2016-01-13 527 goto out_free; e201d01da Markus Elfring 2017-01-21 528 } 988b86e69 Martin Schwidefsky 2016-01-13 529 e201d01da Markus Elfring 2017-01-21 530 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0) { 988b86e69 Martin Schwidefsky 2016-01-13 531 rc = -EINVAL; 988b86e69 Martin Schwidefsky 2016-01-13 532 goto out_free; e201d01da Markus Elfring 2017-01-21 533 } 988b86e69 Martin Schwidefsky 2016-01-13 534 988b86e69 Martin Schwidefsky 2016-01-13 535 switch (req->lps) { 988b86e69 Martin Schwidefsky 2016-01-13 536 case 0: 988b86e69 Martin Schwidefsky 2016-01-13 537 rc = clp_base_command(req, lpcb); 988b86e69 Martin Schwidefsky 2016-01-13 538 break; 988b86e69 Martin Schwidefsky 2016-01-13 539 case 2: 988b86e69 Martin Schwidefsky 2016-01-13 540 rc = clp_pci_command(req, lpcb); 988b86e69 Martin Schwidefsky 2016-01-13 541 break; 988b86e69 Martin Schwidefsky 2016-01-13 542 } 988b86e69 Martin Schwidefsky 2016-01-13 @543 if (rc) 988b86e69 Martin Schwidefsky 2016-01-13 544 goto out_free; 988b86e69 Martin Schwidefsky 2016-01-13 545 988b86e69 Martin Schwidefsky 2016-01-13 546 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0) e201d01da Markus Elfring 2017-01-21 547 rc = -EFAULT; 988b86e69 Martin Schwidefsky 2016-01-13 548 988b86e69 Martin Schwidefsky 2016-01-13 549 rc = 0; 988b86e69 Martin Schwidefsky 2016-01-13 550 988b86e69 Martin Schwidefsky 2016-01-13 551 out_free: :::::: The code at line 543 was first introduced by commit :::::: 988b86e69ded17f0f1209fd3ef1c4c7f1567dcc1 s390/pci: add ioctl interface for CLP :::::: TO: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> :::::: CC: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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