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authorMatthew Wilcox <mawilcox@microsoft.com>2016-12-20 18:27:56 +0300
committerMatthew Wilcox <mawilcox@microsoft.com>2017-02-14 05:44:01 +0300
commit0a835c4f090af2c76fc2932c539c3b32fd21fbbb (patch)
tree729c24514309afc323ee08e6d8336eb1e558406e /init
parent0ac398ef391b53122976325ab6953456ce8e8310 (diff)
downloadlinux-0a835c4f090af2c76fc2932c539c3b32fd21fbbb.tar.xz
Reimplement IDR and IDA using the radix tree
The IDR is very similar to the radix tree. It has some functionality that the radix tree did not have (alloc next free, cyclic allocation, a callback-based for_each, destroy tree), which is readily implementable on top of the radix tree. A few small changes were needed in order to use a tag to represent nodes with free space below them. More extensive changes were needed to support storing NULL as a valid entry in an IDR. Plain radix trees still interpret NULL as a not-present entry. The IDA is reimplemented as a client of the newly enhanced radix tree. As in the current implementation, it uses a bitmap at the last level of the tree. Signed-off-by: Matthew Wilcox <willy@infradead.org> Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/main.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/init/main.c b/init/main.c
index b0c9d6facef9..a65e3aad31bc 100644
--- a/init/main.c
+++ b/init/main.c
@@ -553,7 +553,7 @@ asmlinkage __visible void __init start_kernel(void)
if (WARN(!irqs_disabled(),
"Interrupts were enabled *very* early, fixing it\n"))
local_irq_disable();
- idr_init_cache();
+ radix_tree_init();
/*
* Allow workqueue creation and work item queueing/cancelling
@@ -568,7 +568,6 @@ asmlinkage __visible void __init start_kernel(void)
trace_init();
context_tracking_init();
- radix_tree_init();
/* init some links before init_ISA_irqs() */
early_irq_init();
init_IRQ();