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2018-08-21devpts: Convert to new IDA APIMatthew Wilcox1-34/+13
ida_alloc_max() matches what this driver wants to do. Also removes a call to ida_pre_get(). We no longer need the protection of the mutex, so convert pty_count to an atomic_t and remove the mutex entirely. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-21fs: Convert namespace IDAs to new APIMatthew Wilcox1-38/+12
We don't need to keep track of the starting value; the IDA is efficient. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-21fs: Convert unnamed_dev_ida to new APIMatthew Wilcox1-43/+24
The new API is much easier for this user. Also add kerneldoc for get_anon_bdev(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-21mtip32xx: Convert to new IDA APIMatthew Wilcox1-23/+6
Removes a use of ida_pre_get() and a personalised spinlock. Signed-off-by: Matthew Wilcox <willy@infradead.org> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
2018-08-21ida: Add new APIMatthew Wilcox2-42/+87
Add ida_alloc(), ida_alloc_min(), ida_alloc_max(), ida_alloc_range() and ida_free(). The ida_alloc_max() and ida_alloc_range() functions differ from ida_simple_get() in that they take an inclusive 'max' parameter instead of an exclusive 'end' parameter. Callers are about evenly split whether they'd like inclusive or exclusive parameters and 'max' is easier to document than 'end'. Change the IDA allocation to first attempt to allocate a bit using existing memory, and only allocate memory afterwards. Also change the behaviour of 'min' > INT_MAX from being a BUG() to returning -ENOSPC. Leave compatibility wrappers in place for ida_simple_get() and ida_simple_remove() to avoid changing all callers. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-21ida: Lock the IDA in ida_destroyMatthew Wilcox1-6/+11
The user has no need to handle locking between ida_simple_get() and ida_simple_remove(). They shouldn't be forced to think about whether ida_destroy() might be called at the same time as any of their other IDA manipulation calls. Improve the documnetation while I'm in here. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-21radix-tree: Fix UBSAN warningMatthew Wilcox1-1/+1
get_slot_offset() can be called with a NULL 'parent' argument. In this case, the calculated value will not be used, but calculating it is undefined. Rather than fixing the caller (__radix_tree_delete) to not call get_slot_offset(), make get_slot_offset() robust against being called with a NULL parent. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-21radix tree test suite: Enable ubsanMatthew Wilcox2-11/+14
Add support for the undefined behaviour sanitizer and fix the bugs that ubsan pointed out. Nothing major, and all in the test suite, not the code. Signed-off-by: Matthew Wilcox <willy@infradead.org>