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xarray: Replace exceptional entries

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Introduce xarray value entries and tagged pointers to replace radix
tree exceptional entries.  This is a slight change in encoding to allow
the use of an extra bit (we can now store BITS_PER_LONG - 1 bits in a
value entry).  It is also a change in emphasis; exceptional entries are
intimidating and different.  As the comment explains, you can choose
to store values or pointers in the xarray and they are both first-class
citizens.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Matthew Wilcox
2017-11-03 13:30:42 -04:00
parent 66ee620f06
commit 3159f943aa
26 changed files with 278 additions and 232 deletions
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6
tools/testing/radix-tree/idr-test.c
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@@ -19,7 +19,7 @@
#include "test.h"
#define DUMMY_PTR ((void *)0x12)
#define DUMMY_PTR ((void *)0x10)
int item_idr_free(int id, void *p, void *data)
{
@@ -411,11 +411,11 @@ void ida_check_conv_user(void)
int id = ida_alloc(&ida, GFP_NOWAIT);
if (id == -ENOMEM) {
IDA_BUG_ON(&ida, (i % IDA_BITMAP_BITS) !=
BITS_PER_LONG - 2);
BITS_PER_XA_VALUE);
id = ida_alloc(&ida, GFP_KERNEL);
} else {
IDA_BUG_ON(&ida, (i % IDA_BITMAP_BITS) ==
BITS_PER_LONG - 2);
BITS_PER_XA_VALUE);
}
IDA_BUG_ON(&ida, id != i);
}