* Re: [PATCH v9 4/4] irqchip/irq-loongarch-ir:Add Redirect irqchip support
[not found] <20260130025941.2140582-5-zhangtianyang@loongson.cn>
@ 2026-01-30 8:33 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-01-30 8:33 UTC (permalink / raw)
To: Tianyang Zhang, chenhuacai, kernel, corbet, alexs, si.yanteng,
tglx, jiaxun.yang, maobibo
Cc: llvm, oe-kbuild-all, loongarch, linux-doc, linux-kernel,
Tianyang Zhang, Liupu Wang
Hi Tianyang,
kernel test robot noticed the following build warnings:
[auto build test WARNING on tip/irq/core]
[also build test WARNING on linus/master v6.19-rc7 next-20260129]
[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/Tianyang-Zhang/Docs-LoongArch-Add-Advanced-Extended-Redirect-IRQ-model-description/20260130-110249
base: tip/irq/core
patch link: https://lore.kernel.org/r/20260130025941.2140582-5-zhangtianyang%40loongson.cn
patch subject: [PATCH v9 4/4] irqchip/irq-loongarch-ir:Add Redirect irqchip support
config: loongarch-allnoconfig (https://download.01.org/0day-ci/archive/20260130/202601301601.EonMu52D-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260130/202601301601.EonMu52D-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601301601.EonMu52D-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/irqchip/irq-loongarch-ir.c:203:6: warning: variable 'order' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
203 | if (nr_irqs > 1) {
| ^~~~~~~~~~~
drivers/irqchip/irq-loongarch-ir.c:211:19: note: uninitialized use occurs here
211 | IRD_ENTRIES, order);
| ^~~~~
drivers/irqchip/irq-loongarch-ir.c:203:2: note: remove the 'if' if its condition is always true
203 | if (nr_irqs > 1) {
| ^~~~~~~~~~~~~~~~
drivers/irqchip/irq-loongarch-ir.c:201:27: note: initialize the variable 'order' to silence this warning
201 | unsigned int index, order;
| ^
| = 0
1 warning generated.
vim +203 drivers/irqchip/irq-loongarch-ir.c
197
198 static int redirect_table_alloc(int node, u32 nr_irqs)
199 {
200 struct redirect_table *ird_table = &irde_descs[node].ird_table;
201 unsigned int index, order;
202
> 203 if (nr_irqs > 1) {
204 nr_irqs = __roundup_pow_of_two(nr_irqs);
205 order = ilog2(nr_irqs);
206 }
207
208 guard(raw_spinlock_irqsave)(&ird_table->lock);
209
210 index = bitmap_find_free_region(ird_table->bitmap,
211 IRD_ENTRIES, order);
212 if (index < 0) {
213 pr_err("No redirect entry to use\n");
214 return -ENOMEM;
215 }
216
217 return index;
218 }
219
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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