Messages in this thread | | | Date | Sat, 6 Nov 2021 00:55:10 +0800 | From | kernel test robot <> | Subject | mm/vmalloc.c:2782:58: warning: operation on 'data->idx' may be undefined |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d4439a1189f93d0ac1eaf0197db8e6b3e197d5c7 commit: 9a8797722e4239242d0cb4cc4baa805df6ac979e Drivers: hv: vmbus: Initialize VMbus ring buffer for Isolation VM date: 8 days ago config: arm64-randconfig-r022-20211105 (attached as .config) compiler: aarch64-linux-gcc (GCC) 11.2.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9a8797722e4239242d0cb4cc4baa805df6ac979e git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 9a8797722e4239242d0cb4cc4baa805df6ac979e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm64
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
In file included from arch/arm64/include/asm/kasan.h:10, from arch/arm64/include/asm/processor.h:39, from include/asm-generic/qrwlock.h:14, from ./arch/arm64/include/generated/asm/qrwlock.h:1, from arch/arm64/include/asm/spinlock.h:9, from include/linux/spinlock.h:94, from include/linux/vmalloc.h:5, from mm/vmalloc.c:11: mm/vmalloc.c: In function 'vmap_pfn_apply': >> mm/vmalloc.c:2782:58: warning: operation on 'data->idx' may be undefined [-Wsequence-point] 2782 | *pte = pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot)); | ~~~~~~~~~^~ arch/arm64/include/asm/pgtable-types.h:25:37: note: in definition of macro '__pte' 25 | #define __pte(x) ((pte_t) { (x) } ) | ^ arch/arm64/include/asm/pgtable.h:80:15: note: in expansion of macro '__phys_to_pte_val' 80 | __pte(__phys_to_pte_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) | ^~~~~~~~~~~~~~~~~ mm/vmalloc.c:2782:30: note: in expansion of macro 'pfn_pte' 2782 | *pte = pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot)); | ^~~~~~~
vim +2782 mm/vmalloc.c
3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2775 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2776 static int vmap_pfn_apply(pte_t *pte, unsigned long addr, void *private) 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2777 { 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2778 struct vmap_pfn_data *data = private; 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2779 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2780 if (WARN_ON_ONCE(pfn_valid(data->pfns[data->idx]))) 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2781 return -EINVAL; 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 @2782 *pte = pte_mkspecial(pfn_pte(data->pfns[data->idx++], data->prot)); 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2783 return 0; 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2784 } 3e9a9e256b1e1e Christoph Hellwig 2020-10-17 2785
:::::: The code at line 2782 was first introduced by commit :::::: 3e9a9e256b1e1e6e8f19faf76fa9c37578ae35ee mm: add a vmap_pfn function
:::::: TO: Christoph Hellwig <hch@lst.de> :::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
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