Hi Shradha, kernel test robot noticed the following build warnings: [auto build test WARNING on pci/next] [also build test WARNING on pci/for-linus linus/master v6.15-rc5 next-20250507] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Shradha-Gupta/PCI-hv-enable-pci_hyperv-to-allow-dynamic-vector-allocation/20250416-233828 base: https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next patch link: https://lore.kernel.org/r/1744817781-3243-1-git-send-email-shradhagupta%40linux.microsoft.com patch subject: [PATCH 2/2] net: mana: Allow MANA driver to allocate PCI vector dynamically config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20250508/202505080049.7AvfzOGc-lkp@xxxxxxxxx/config) compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250508/202505080049.7AvfzOGc-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202505080049.7AvfzOGc-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/net/ethernet/microsoft/mana/gdma_main.c:500:2: warning: variable 'gic' is used uninitialized whenever 'for' loop exits because its condition is false [-Wsometimes-uninitialized] 500 | list_for_each(pos, &gc->irq_contexts) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/list.h:687:27: note: expanded from macro 'list_for_each' 687 | for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/microsoft/mana/gdma_main.c:510:7: note: uninitialized use occurs here 510 | if (!gic) | ^~~ drivers/net/ethernet/microsoft/mana/gdma_main.c:500:2: note: remove the condition if it is always true 500 | list_for_each(pos, &gc->irq_contexts) { | ^ include/linux/list.h:687:27: note: expanded from macro 'list_for_each' 687 | for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next) | ^ drivers/net/ethernet/microsoft/mana/gdma_main.c:475:30: note: initialize the variable 'gic' to silence this warning 475 | struct gdma_irq_context *gic; | ^ | = NULL drivers/net/ethernet/microsoft/mana/gdma_main.c:541:2: warning: variable 'gic' is used uninitialized whenever 'for' loop exits because its condition is false [-Wsometimes-uninitialized] 541 | list_for_each(pos, &gc->irq_contexts) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/list.h:687:27: note: expanded from macro 'list_for_each' 687 | for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/microsoft/mana/gdma_main.c:551:7: note: uninitialized use occurs here 551 | if (!gic) | ^~~ drivers/net/ethernet/microsoft/mana/gdma_main.c:541:2: note: remove the condition if it is always true 541 | list_for_each(pos, &gc->irq_contexts) { | ^ include/linux/list.h:687:27: note: expanded from macro 'list_for_each' 687 | for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next) | ^ drivers/net/ethernet/microsoft/mana/gdma_main.c:523:30: note: initialize the variable 'gic' to silence this warning 523 | struct gdma_irq_context *gic; | ^ | = NULL 2 warnings generated. vim +500 drivers/net/ethernet/microsoft/mana/gdma_main.c 470 471 static int mana_gd_register_irq(struct gdma_queue *queue, 472 const struct gdma_queue_spec *spec) 473 { 474 struct gdma_dev *gd = queue->gdma_dev; 475 struct gdma_irq_context *gic; 476 struct gdma_context *gc; 477 unsigned int msi_index; 478 struct list_head *pos; 479 unsigned long flags, flag_irq; 480 struct device *dev; 481 int err = 0, count; 482 483 gc = gd->gdma_context; 484 dev = gc->dev; 485 msi_index = spec->eq.msix_index; 486 487 if (msi_index >= gc->num_msix_usable) { 488 err = -ENOSPC; 489 dev_err(dev, "Register IRQ err:%d, msi:%u nMSI:%u", 490 err, msi_index, gc->num_msix_usable); 491 492 return err; 493 } 494 495 queue->eq.msix_index = msi_index; 496 497 /* get the msi_index value from the list*/ 498 count = 0; 499 spin_lock_irqsave(&gc->irq_ctxs_lock, flag_irq); > 500 list_for_each(pos, &gc->irq_contexts) { 501 if (count == msi_index) { 502 gic = list_entry(pos, struct gdma_irq_context, gic_list); 503 break; 504 } 505 506 count++; 507 } 508 spin_unlock_irqrestore(&gc->irq_ctxs_lock, flag_irq); 509 510 if (!gic) 511 return -1; 512 513 spin_lock_irqsave(&gic->lock, flags); 514 list_add_rcu(&queue->entry, &gic->eq_list); 515 spin_unlock_irqrestore(&gic->lock, flags); 516 517 return 0; 518 } 519 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
