Re: [PATCH v2] drivers/base/memory.c: cache blocks in radix tree to accelerate lookup

[kbuild test robot]

Hi Scott,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on driver-core/driver-core-testing]
[also build test WARNING on v5.4]
[cannot apply to next-20191122]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Scott-Cheloha/drivers-base-memory-c-cache-blocks-in-radix-tree-to-accelerate-lookup/20191124-104557
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git 0e4a459f56c32d3e52ae69a4b447db2f48a65f44
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-36-g9305d48-dirty
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>


sparse warnings: (new ones prefixed by >>)

>> drivers/base/memory.c:874:9: sparse: sparse: incorrect type in assignment (different address spaces) @@    expected void **slot @@    got void [noderef] <asvoid **slot @@
>> drivers/base/memory.c:874:9: sparse:    expected void **slot
>> drivers/base/memory.c:874:9: sparse:    got void [noderef] <asn:4> **
>> drivers/base/memory.c:874:9: sparse: sparse: incorrect type in assignment (different address spaces) @@    expected void **slot @@    got void [noderef] <asvoid **slot @@
>> drivers/base/memory.c:874:9: sparse:    expected void **slot
>> drivers/base/memory.c:874:9: sparse:    got void [noderef] <asn:4> **
>> drivers/base/memory.c:877:45: sparse: sparse: incorrect type in argument 1 (different address spaces) @@    expected void [noderef] <asn:4> **slot @@    got n:4> **slot @@
>> drivers/base/memory.c:877:45: sparse:    expected void [noderef] <asn:4> **slot
>> drivers/base/memory.c:877:45: sparse:    got void **slot
   drivers/base/memory.c:874:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@    expected void [noderef] <asn:4> **slot @@    got n:4> **slot @@
   drivers/base/memory.c:874:9: sparse:    expected void [noderef] <asn:4> **slot
   drivers/base/memory.c:874:9: sparse:    got void **slot
>> drivers/base/memory.c:874:9: sparse: sparse: incorrect type in assignment (different address spaces) @@    expected void **slot @@    got void [noderef] <asvoid **slot @@
>> drivers/base/memory.c:874:9: sparse:    expected void **slot
>> drivers/base/memory.c:874:9: sparse:    got void [noderef] <asn:4> **

vim +874 drivers/base/memory.c

   845	
   846	/**
   847	 * walk_memory_blocks - walk through all present memory blocks overlapped
   848	 *			by the range [start, start + size)
   849	 *
   850	 * @start: start address of the memory range
   851	 * @size: size of the memory range
   852	 * @arg: argument passed to func
   853	 * @func: callback for each memory section walked
   854	 *
   855	 * This function walks through all present memory blocks overlapped by the
   856	 * range [start, start + size), calling func on each memory block.
   857	 *
   858	 * In case func() returns an error, walking is aborted and the error is
   859	 * returned.
   860	 */
   861	int walk_memory_blocks(unsigned long start, unsigned long size,
   862			       void *arg, walk_memory_blocks_func_t func)
   863	{
   864		struct radix_tree_iter iter;
   865		const unsigned long start_block_id = phys_to_block_id(start);
   866		const unsigned long end_block_id = phys_to_block_id(start + size - 1);
   867		struct memory_block *mem;
   868		void **slot;
   869		int ret = 0;
   870	
   871		if (!size)
   872			return 0;
   873	
 > 874		radix_tree_for_each_slot(slot, &memory_blocks, &iter, start_block_id) {
   875			if (iter.index > end_block_id)
   876				break;
 > 877			mem = radix_tree_deref_slot(slot);

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