This adds comments above radix_tree_next_slot() documenting the combination of factors that prevent us from dereferencing a NULL 'slot' pointer. It also adds a radix tree unit test so that we can easily catch any unhandled NULL pointer issues with radix_tree_next_slot().
Changes from V1: - Instead of adding an explicit check for 'slot' being NULL at the beginning of radix_tree_next_slot(), document what factors are keeping us safe instead. (Konstantin) Ross Zwisler (3): radix-tree: 'slot' can be NULL in radix_tree_next_slot() radix-tree tests: add iteration test radix-tree tests: properly initialize mutex include/linux/radix-tree.h | 8 ++ tools/testing/radix-tree/Makefile | 3 +- tools/testing/radix-tree/iteration_check.c | 180 +++++++++++++++++++++++++++++ tools/testing/radix-tree/main.c | 1 + tools/testing/radix-tree/regression1.c | 2 +- tools/testing/radix-tree/test.h | 1 + 6 files changed, 193 insertions(+), 2 deletions(-) create mode 100644 tools/testing/radix-tree/iteration_check.c -- 2.9.0
