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* radix-tree: remove root->heightMatthew Wilcox2016-05-202-78/+31
| | | | | | | | | | | | | | The only remaining references to root->height were in extend and shrink, where it was updated. Now we can remove it entirely. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: remove dependencies on heightMatthew Wilcox2016-05-202-12/+25
| | | | | | | | | | | | | | | | verify_node() can use node->shift instead of the height. tree_verify_min_height() can be converted over to using node_maxindex() and shift_maxindex() instead of radix_tree_maxindex(). Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: remove a use of root->height from delete_nodeMatthew Wilcox2016-05-201-6/+8
| | | | | | | | | | | | | | | If radix_tree_shrink returns whether it managed to shrink, then __radix_tree_delete_node doesn't ned to query the tree to find out whether it did any work or not. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: replace node->height with node->shiftMatthew Wilcox2016-05-202-15/+17
| | | | | | | | | | | | | | | node->shift represents the shift necessary for looking in the slots array at this level. It is equal to the old (node->height - 1) * RADIX_TREE_MAP_SHIFT. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: split node->path into offset and heightMatthew Wilcox2016-05-202-26/+19
| | | | | | | | | | | | | | | Neither piece of information we're storing in node->path can be larger than 64, so store each in its own unsigned char instead of shifting and masking to store them both in an unsigned int. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: miscellaneous fixesMatthew Wilcox2016-05-201-34/+36
| | | | | | | | | | | | | Typos, whitespace, grammar, line length, using the correct types, etc. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/hwspinlock: use correct radix tree APIMatthew Wilcox2016-05-201-1/+1
| | | | | | | | | | | | | | | | radix_tree_is_indirect_ptr() is an internal API. The correct call to use is radix_tree_deref_retry() which has the appropriate unlikely() annotation. Fixes: c6400ba7e13a ("drivers/hwspinlock: fix race between radix tree insertion and lookup") Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: add copyright statementsMatthew Wilcox2016-05-201-0/+2
| | | | | | | | | | | | | | The multiorder support is a sufficiently large feature to be worth adding copyrigt lines for. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix radix_tree_dump() for multi-order entriesRoss Zwisler2016-05-202-19/+30
| | | | | | | | | | | | | | | | - Print which indices are covered by every leaf entry - Print sibling entries - Print the node pointer instead of the slot entry - Build by default in userspace, and make it accessible to the test-suite Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix radix_tree_range_tag_if_tagged() for multiorder entriesMatthew Wilcox2016-05-203-44/+67
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I had previously decided that tagging a single multiorder entry would count as tagging 2^order entries for the purposes of 'nr_to_tag'. I now believe that decision to be a mistake, and it should count as a single entry. That's more likely to be what callers expect. When walking back up the tree from a newly-tagged entry, the current code assumed we were starting from the lowest level of the tree; if we have a multiorder entry with an order at least RADIX_TREE_MAP_SHIFT in size then we need to shift the index by 'shift' before we start walking back up the tree, or we will end up not setting tags on higher entries, and then mistakenly thinking that entries below a certain point in the tree are not tagged. If the first index we examine is a sibling entry of a tagged multiorder entry, we were not tagging it. We need to examine the canonical entry, and the easiest way to do that is to use radix_tree_descend(). We then have to skip over sibling slots when looking for the next entry in the tree or we will end up walking back to the canonical entry. Add several tests for radix_tree_range_tag_if_tagged(). Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: add test for radix_tree_locate_item()Ross Zwisler2016-05-202-1/+15
| | | | | | | | | | | | | | Add a unit test that provides coverage for the bug fixed in the commit entitled "radix-tree: rewrite radix_tree_locate_item fix" from Hugh Dickins. I've verified that this test fails before his patch due to miscalculated 'index' values in __locate() in lib/radix-tree.c, and passes with his fix. Link: http://lkml.kernel.org/r/1462307263-20623-1-git-send-email-ross.zwisler@linux.intel.com Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: rewrite radix_tree_locate_itemMatthew Wilcox2016-05-202-56/+61
| | | | | | | | | | | | | | | | | Use the new multi-order support functions to rewrite radix_tree_locate_item(). Modify the locate tests to test multiorder entries too. [hughd@google.com: radix_tree_locate_item() is often returning the wrong index] Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1605012108490.1166@eggly.anvils Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix radix_tree_create for sibling entriesMatthew Wilcox2016-05-202-2/+7
| | | | | | | | | | | | | | | | | If the radix tree user attempted to insert a colliding entry with an existing multiorder entry, then radix_tree_create() could encounter a sibling entry when walking down the tree to look for a slot. Use radix_tree_descend() to fix the problem, and add a test-case to make sure the problem doesn't come back in future. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree test suite: add multi-order tag testRoss Zwisler2016-05-201-0/+97
| | | | | | | | | | | | | | | | | | | | | | | Add a generic test for multi-order tag verification, and call it using several different configurations. This test creates a multi-order radix tree using the given index and order, and then sets, checks and clears tags using the indices covered by the single multi-order radix tree entry. With the various calls done by this test we verify root multi-order entries without siblings, multi-order entries without siblings in a radix tree node, as well as multi-order entries with siblings of various sizes. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: rewrite radix_tree_tag_getRoss Zwisler2016-05-201-26/+18
| | | | | | | | | | | | | | Use the new multi-order support functions to rewrite radix_tree_tag_get() Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: rewrite radix_tree_tag_clearRoss Zwisler2016-05-201-24/+20
| | | | | | | | | | | | | | Use the new multi-order support functions to rewrite radix_tree_tag_clear() Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: rewrite radix_tree_tag_setRoss Zwisler2016-05-201-20/+17
| | | | | | | | | | | | | | Use the new multi-order support functions to rewrite radix_tree_tag_set() Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: multi-order iteration testRoss Zwisler2016-05-201-0/+92
| | | | | | | | | | | | | | | | | | | | | | | | | Add a unit test to verify that we can iterate over multi-order entries properly via a radix_tree_for_each_slot() loop. This was done with a single, somewhat complicated configuration that was meant to test many of the various corner cases having to do with multi-order entries: - An iteration could begin at a sibling entry, and we need to return the canonical entry. - We could have entries of various orders in the same slots[] array. - We could have multi-order entries at a nonzero height, followed by indirect pointers to more radix tree nodes later in that same slots[] array. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: add support for multi-order iteratingRoss Zwisler2016-05-204-41/+102
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This enables the macros radix_tree_for_each_slot() and friends to be used with multi-order entries. The way that this works is that we treat all entries in a given slots[] array as a single chunk. If the index given to radix_tree_next_chunk() happens to point us to a sibling entry, we will back up iter->index so that it points to the canonical entry, and that will be the place where we start our iteration. As we're processing a chunk in radix_tree_next_slot(), we process canonical entries, skip over sibling entries, and restart the chunk lookup if we find a non-sibling indirect pointer. This drops back to the radix_tree_next_chunk() code, which will re-walk the tree and look for another chunk. This allows us to properly handle multi-order entries mixed with other entries that are at various heights in the radix tree. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix multiorder BUG_ON in radix_tree_insertMatthew Wilcox2016-05-202-4/+22
| | | | | | | | | | | | | | | | | | | | | | These BUG_ON tests are to ensure that all the tags are clear when inserting a new entry. If we insert a multiorder entry, we'll end up looking at the tags for a different node, and so the BUG_ON can end up triggering spuriously. Also, we now have three tags, not two, so check all three are clear, and check all the root tags with a single call to BUG_ON since the bits are stored contiguously. Include a test-case to ensure this problem does not reoccur. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: rewrite __radix_tree_lookupMatthew Wilcox2016-05-201-32/+16
| | | | | | | | | | | | | Use the new multi-order support functions to rewrite __radix_tree_lookup() Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix several shrinking bugs with multiorder entriesMatthew Wilcox2016-05-202-11/+51
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Setting the indirect bit on the user data entry used to be unambiguous because the tree walking code knew not to expect internal nodes in the last level of the tree. Multiorder entries can appear at any level of the tree, and a leaf with the indirect bit set is indistinguishable from a pointer to a node. Introduce a special entry (RADIX_TREE_RETRY) which is neither a valid user entry, nor a valid pointer to a node. The radix_tree_deref_retry() function continues to work the same way, but tree walking code can distinguish it from a pointer to a node. Also fix the condition for setting slot->parent to NULL; it does not matter what height the tree is, it only matters whether slot is an indirect pointer. Move this code above the comment which is referring to the assignment to root->rnode. Also fix the condition for preventing the tree from shrinking to a single entry if it's a multiorder entry. Add a test-case to the test suite that checks that the tree goes back down to its original height after an item is inserted & deleted from a higher index in the tree. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: start adding multiorder testsMatthew Wilcox2016-05-205-5/+76
| | | | | | | | | | | | | | | | | | | | Test suite infrastructure for working with multiorder entries. The test itself is pretty basic: Add an entry, check that all expected indices return that entry and that indices around that entry don't return an entry. Then delete the entry and check no index returns that entry. Tests a few edge conditions including the multiorder entry at index 0 and at a higher index. Also tests deleting through an alias as well as through the canonical index. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix extending the tree for multi-order entries at offset 0Matthew Wilcox2016-05-201-11/+17
| | | | | | | | | | | | | | | | | | | | | The current code will insert entries at each level, as if we're going to add a new entry at the bottom level, so we then get an -EEXIST when we try to insert the entry into the tree. The best way to fix this is to not check 'order' when inserting into an empty tree. We still need to 'extend' the tree to the height necessary for the maximum index corresponding to this entry, so pass that value to radix_tree_extend() rather than the index we're asked to create, or we won't create a tree that's deep enough. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: introduce radix_tree_load_root()Matthew Wilcox2016-05-201-0/+23
| | | | | | | | | | | | | | | All the tree walking functions start with some variant of this code; centralise it in one place so we're not chasing subtly different bugs everywhere. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: remove restriction on multi-order entriesMatthew Wilcox2016-05-201-2/+0
| | | | | | | | | | | | | | Now that sibling pointers are handled explicitly, there is no purpose served by restricting the order to be >= RADIX_TREE_MAP_SHIFT. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix deleting a multi-order entry through an aliasMatthew Wilcox2016-05-201-1/+1
| | | | | | | | | | | | | | | If we deleted an entry through an index which looked up a sibling pointer, we'd end up zeroing out the wrong slots in the node. Use get_slot_offset() to find the right slot. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: fix sibling entry insertionMatthew Wilcox2016-05-201-2/+2
| | | | | | | | | | | | | | The subtraction was the wrong way round, leading to undefined behaviour (shift by an amount larger than the size of the type). Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: add missing sibling entry functionalityMatthew Wilcox2016-05-201-0/+40
| | | | | | | | | | | | | | | | The code I previously added to enable multiorder radix tree entries was untested and therefore buggy. This commit adds the support functions that Ross and I decided were necessary over a four-week period of iterating various designs. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* raxix-tree: introduce CONFIG_RADIX_TREE_MULTIORDERMatthew Wilcox2016-05-204-8/+23
| | | | | | | | | | | | | | | | | | | I've been receiving increasingly concerned notes from 0day about how much my recent changes have been bloating the radix tree. Make it happier by only including multiorder support if CONFIG_TRANSPARENT_HUGEPAGES is set. This is an independent Kconfig option, so other radix tree users can also set it if they have a need. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: remove unused looping macrosRoss Zwisler2016-05-201-28/+0
| | | | | | | | | | | | | | | radix_tree_for_each_chunk() and radix_tree_for_each_chunk_slot() have never been used in the kernel since their introduction in 2012, so remove them. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: rebuild when headers changeRoss Zwisler2016-05-201-1/+1
| | | | | | | | | | | | | | | | | | | | | When we make changes to radix-tree.h in the regular kernel source (include/linux/radix-tree.h), we really want our test code to be rebuilt. We also include a few other headers from tools/include and probably want to rebuild if these have been changed. Update the makefile so that all of our objects will be rebuilt when any of the headers we depend on are changed. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: keep regression test runs shortRoss Zwisler2016-05-201-7/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the full suite of regression tests take upwards of 30 minutes to run on my development machine. The vast majority of this time is taken by the big_gang_check() and copy_tag_check() tests, which each run their tests through thousands of iterations...does this have value? Without big_gang_check() and copy_tag_check(), the test suite runs in around 15 seconds on my box. Honestly the first time I ever ran through the entire test suite was to gather the timings for this email - it simply takes too long to be useful on a normal basis. Instead, hide the excessive iterations through big_gang_check() and copy_tag_check() tests behind an '-l' flag (for "long run") in case they are still useful, but allow the regression test suite to complete in a reasonable amount of time. We still run each of these tests a few times (3 at present) to try and keep the test coverage. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: allow testing other fan-out valuesRoss Zwisler2016-05-203-10/+3
| | | | | | | | | | | | | | | | | The defines in regression2.c are already in radix-tree.h and duplicating them in the test case makes experimenting with other values for the fan-out harder than necessary. Allow the user of the radix tree to decide what the fan-out should be rather than fixing it to 8 for non-kernel uses. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: add tests for radix_tree_locate_item()Matthew Wilcox2016-05-202-0/+44
| | | | | | | | | | | | | | | Fairly simple tests; add various items to the tree, then make sure we can find them again. Also check that a pointer that we know isn't in the tree is not found. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix tree test suite: fix buildMatthew Wilcox2016-05-203-8/+12
| | | | | | | | | | | | | | | | Add an empty linux/init.h, and definitions for a few parts of the kernel API either in use now, or to be used in the near future. Start using the common definitions in tools/include/linux, although more work needs to be done here. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Jan Kara <jack@suse.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* radix-tree: introduce radix_tree_emptyMatthew Wilcox2016-05-202-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit e61452365372 ("radix_tree: add support for multi-order entries") left the impression that the support for multiorder radix tree entries was functional. As soon as Ross tried to use it, it became apparent that my testing was completely inadequate, and it didn't even work a little bit for orders that were not a multiple of shift. This series of patches is the result of about 6 weeks of redesign, reimplementation, testing, arguing and hair-pulling. The great news is that the test-suite is now far better than it was. That's reflected in the diffstat for the test-suite alone: 12 files changed, 436 insertions(+), 28 deletions(-) The highlight for users of the tree is that the restriction on the order of inserted entries being >= RADIX_TREE_MAP_SHIFT is now gone; the radix tree now supports any order between 0 and 64. For those who are interested in how the tree works, patch 9 is probably the most interesting one as it introduces the new machinery for handling sibling entries. I've tried to be fair in attributing authorship to the person who contributed the majority of the code in each patch; Ross has been an invaluable partner in the development of this support and it's fair to say that each of us has code in every commit. I should also express my appreciation of the 0day testing. It prompted me that I was bloating the tinyconfig in an unacceptable way, and it bisected to a commit which contained a rather nasty memory-corruption bug. This patch (of 29): The irqdomain code was checking for 0 or 1 entries, not 0 entries like the comment said they were. Introduce a new helper that will actually check for an empty tree. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* drivers/platform/x86/wmi.c: use generic UUID libraryAndy Shevchenko2016-05-201-91/+13
| | | | | | | | | Instead of opencoding let's use generic UUID library functions here. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* block/partitions/ldm.c: use generic UUID libraryAndy Shevchenko2016-05-201-56/+4
| | | | | | | | | | Instead of opencoding let's use generic UUID library functions here. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* include/linux/genhd.h: move to use generic UUID libraryAndy Shevchenko2016-05-201-20/+3
| | | | | | | | | | | | | | | | | UUID library provides uuid_be type and uuid_be_to_bin() function. This substitutes open coded variant by generic library calls. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs/efivarfs/inode.c: use generic UUID libraryAndy Shevchenko2016-05-201-37/+3
| | | | | | | | | | | | | | | | Instead of opencoding let's use generic UUID library functions here. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* include/linux/efi.h: redefine type, constant, macro from generic codeAndy Shevchenko2016-05-201-10/+4
| | | | | | | | | | | | | | | | | | | Generic UUID library defines structure type, macro to define UUID, and the length of the UUID string. This patch removes duplicate data structure definition, UUID string length constant as well as macro for UUID handling. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kernel/sysctl_binary.c: use generic UUID libraryAndy Shevchenko2016-05-201-16/+7
| | | | | | | | | | | | | | | | | UUID library provides uuid_be type and uuid_be_to_bin() function. This substitutes open coded variant by generic library calls. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* lib/uuid.c: remove FSF addressAndy Shevchenko2016-05-203-14/+2
| | | | | | | | | | | | | | | | | | | There is no point in keeping an address in the file since it's subject to change. While here, update Intel Copyright years. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* lib/uuid.c: introduce a few more generic helpersAndy Shevchenko2016-05-203-5/+82
| | | | | | | | | | | | | | | | | | | | | | | | | | There are new helpers in this patch: uuid_is_valid checks if a UUID is valid uuid_be_to_bin converts from string to binary (big endian) uuid_le_to_bin converts from string to binary (little endian) They will be used in future, i.e. in the following patches in the series. This also moves the indices arrays to lib/uuid.c to be shared accross modules. [andriy.shevchenko@linux.intel.com: fix typo] Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* lib/uuid.c: move generate_random_uuid() to uuid.cAndy Shevchenko2016-05-209-26/+28
| | | | | | | | | | | | | | | | Let's gather the UUID related functions under one hood. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* security/integrity/ima/ima_policy.c: use %pU to output UUID in printable formatAndy Shevchenko2016-05-201-12/+2
| | | | | | | | | | | | | | | | | Instead of open coded variant re-use extension that vsprintf.c provides us for ages. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* lib/vsprintf: simplify UUID printingAndy Shevchenko2016-05-201-8/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are few functions here and there along with type definitions that provide UUID API. This series consolidates everything under one hood and converts current users. This has been tested for a while internally, however it doesn't mean we covered all possible cases (especially accuracy of UUID constants after conversion). So, please test this as much as you can and provide your tag. We appreciate the effort. The ACPI conversion is postponed for now to sort more generic things out first. This patch (of 9): Since we have hex_byte_pack_upper() we may use it directly and avoid second loop. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* MAINTAINERS: remove Koichi YasutakeJiri Slaby2016-05-201-1/+0
| | | | | | | | | | | | The MTA says: <yasutake.koichi@jp.panasonic.com>: unknown user: "yasutake.koichi@jp.panasonic.com" Link: http://lkml.kernel.org/r/1462776755-9607-1-git-send-email-jslaby@suse.cz Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* MAINTAINERS: remove defunct spear mailing listEric Engestrom2016-05-201-4/+0
| | | | | | | | | | | | | | | | | It looks like the email address for this mailing list doesn't exist anymore: <spear-devel@list.st.com>: host mxb-00178001.gslb.pphosted.com[91.207.212.93] said: 550 5.1.1 User Unknown (in reply to RCPT TO command) Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Kalle Valo <kvalo@codeaurora.org> Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Jiri Slaby <jslaby@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>