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Hello, I write a static analysis tool (DSAC), and it finds that kfree() can sleep. Here is the call path for kfree(). Please look at it *from the bottom up*. [FUNC] alloc_pages(GFP_KERNEL) arch/x86/mm/pageattr.c, 756: alloc_pages in split_large_page arch/x86/mm/pageattr.c, 1283: split_large_page in __change_page_attr arch/x86/mm/pageattr.c, 1391: __change_page_attr in __change_page_attr_set_clr arch/x86/mm/pageattr.c, 2014: __change_page_attr_set_clr in __set_pages_np arch/x86/mm/pageattr.c, 2034: __set_pages_np in __kernel_map_pages ./include/linux/mm.h, 2488: __kernel_map_pages in kernel_map_pages mm/page_alloc.c, 1074: kernel_map_pages in free_pages_prepare mm/page_alloc.c, 1264: free_pages_prepare in __free_pages_ok mm/page_alloc.c, 4312: __free_pages_ok in __free_pages mm/slub.c, 3914: __free_pages in kfree I always have an impression that kfree() never sleeps, so I feel confused here. So could someone please help me to find the mistake? Thanks in advance :) Best wishes, Jia-Ju Bai |
