Re: [RFC PATCH] x86/pci-dma: add "any" keyword to swiotlb= kernel parameter

Hi Aakarsh,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v7.2-rc6 next-20260804]
[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/Aakarsh-Jain/x86-pci-dma-add-any-keyword-to-swiotlb-kernel-parameter/20260805-183105
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260708114244.246176-1-aakarsh.jain%40oss.qualcomm.com
patch subject: [RFC PATCH] x86/pci-dma: add "any" keyword to swiotlb= kernel parameter
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20260805/[email protected]/config)
compiler: powerpc64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260805/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   kernel/dma/swiotlb.c: In function 'swiotlb_init_late':
>> kernel/dma/swiotlb.c:451:9: error: 'flags' undeclared (first use in this function)
     451 |         flags |= swiotlb_param_flags;
         |         ^~~~~
   kernel/dma/swiotlb.c:451:9: note: each undeclared identifier is reported only once for each function it appears in


vim +/flags +451 kernel/dma/swiotlb.c

   426	
   427	/*
   428	 * Systems with larger DMA zones (those that don't support ISA) can
   429	 * initialize the swiotlb later using the slab allocator if needed.
   430	 * This should be just like above, but with some error catching.
   431	 */
   432	int swiotlb_init_late(size_t size, gfp_t gfp_mask,
   433			int (*remap)(void *tlb, unsigned long nslabs))
   434	{
   435		struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
   436		unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
   437		unsigned int nareas;
   438		unsigned char *vstart = NULL;
   439		unsigned int order, area_order;
   440		bool retried = false;
   441		int rc = 0;
   442	
   443		if (io_tlb_default_mem.nslabs)
   444			return 0;
   445	
   446		if (swiotlb_force_disable)
   447			return 0;
   448	
   449		io_tlb_default_mem.force_bounce = swiotlb_force_bounce;
   450	
 > 451		flags |= swiotlb_param_flags;
   452	

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