linux/lib/test_ida.c
Matthew Wilcox c994b12945 test_ida: Fix lockdep warning
The IDA was declared on the stack instead of statically, so lockdep
triggered a warning that it was improperly initialised.

Reported-by: 0day bot
Tested-by: Rong Chen <rong.a.chen@intel.com>
Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-15 16:31:29 -04:00

178 lines
4.3 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* test_ida.c: Test the IDA API
* Copyright (c) 2016-2018 Microsoft Corporation
* Copyright (c) 2018 Oracle Corporation
* Author: Matthew Wilcox <willy@infradead.org>
*/
#include <linux/idr.h>
#include <linux/module.h>
static unsigned int tests_run;
static unsigned int tests_passed;
#ifdef __KERNEL__
void ida_dump(struct ida *ida) { }
#endif
#define IDA_BUG_ON(ida, x) do { \
tests_run++; \
if (x) { \
ida_dump(ida); \
dump_stack(); \
} else { \
tests_passed++; \
} \
} while (0)
/*
* Straightforward checks that allocating and freeing IDs work.
*/
static void ida_check_alloc(struct ida *ida)
{
int i, id;
for (i = 0; i < 10000; i++)
IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
ida_free(ida, 20);
ida_free(ida, 21);
for (i = 0; i < 3; i++) {
id = ida_alloc(ida, GFP_KERNEL);
IDA_BUG_ON(ida, id < 0);
if (i == 2)
IDA_BUG_ON(ida, id != 10000);
}
for (i = 0; i < 5000; i++)
ida_free(ida, i);
IDA_BUG_ON(ida, ida_alloc_min(ida, 5000, GFP_KERNEL) != 10001);
ida_destroy(ida);
IDA_BUG_ON(ida, !ida_is_empty(ida));
}
/* Destroy an IDA with a single entry at @base */
static void ida_check_destroy_1(struct ida *ida, unsigned int base)
{
IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) != base);
IDA_BUG_ON(ida, ida_is_empty(ida));
ida_destroy(ida);
IDA_BUG_ON(ida, !ida_is_empty(ida));
}
/* Check that ida_destroy and ida_is_empty work */
static void ida_check_destroy(struct ida *ida)
{
/* Destroy an already-empty IDA */
IDA_BUG_ON(ida, !ida_is_empty(ida));
ida_destroy(ida);
IDA_BUG_ON(ida, !ida_is_empty(ida));
ida_check_destroy_1(ida, 0);
ida_check_destroy_1(ida, 1);
ida_check_destroy_1(ida, 1023);
ida_check_destroy_1(ida, 1024);
ida_check_destroy_1(ida, 12345678);
}
/*
* Check what happens when we fill a leaf and then delete it. This may
* discover mishandling of IDR_FREE.
*/
static void ida_check_leaf(struct ida *ida, unsigned int base)
{
unsigned long i;
for (i = 0; i < IDA_BITMAP_BITS; i++) {
IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
base + i);
}
ida_destroy(ida);
IDA_BUG_ON(ida, !ida_is_empty(ida));
IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != 0);
IDA_BUG_ON(ida, ida_is_empty(ida));
ida_free(ida, 0);
IDA_BUG_ON(ida, !ida_is_empty(ida));
}
/*
* Check allocations up to and slightly above the maximum allowed (2^31-1) ID.
* Allocating up to 2^31-1 should succeed, and then allocating the next one
* should fail.
*/
static void ida_check_max(struct ida *ida)
{
unsigned long i, j;
for (j = 1; j < 65537; j *= 2) {
unsigned long base = (1UL << 31) - j;
for (i = 0; i < j; i++) {
IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
base + i);
}
IDA_BUG_ON(ida, ida_alloc_min(ida, base, GFP_KERNEL) !=
-ENOSPC);
ida_destroy(ida);
IDA_BUG_ON(ida, !ida_is_empty(ida));
}
}
/*
* Check handling of conversions between exceptional entries and full bitmaps.
*/
static void ida_check_conv(struct ida *ida)
{
unsigned long i;
for (i = 0; i < IDA_BITMAP_BITS * 2; i += IDA_BITMAP_BITS) {
IDA_BUG_ON(ida, ida_alloc_min(ida, i + 1, GFP_KERNEL) != i + 1);
IDA_BUG_ON(ida, ida_alloc_min(ida, i + BITS_PER_LONG,
GFP_KERNEL) != i + BITS_PER_LONG);
ida_free(ida, i + 1);
ida_free(ida, i + BITS_PER_LONG);
IDA_BUG_ON(ida, !ida_is_empty(ida));
}
for (i = 0; i < IDA_BITMAP_BITS * 2; i++)
IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
for (i = IDA_BITMAP_BITS * 2; i > 0; i--)
ida_free(ida, i - 1);
IDA_BUG_ON(ida, !ida_is_empty(ida));
for (i = 0; i < IDA_BITMAP_BITS + BITS_PER_LONG - 4; i++)
IDA_BUG_ON(ida, ida_alloc(ida, GFP_KERNEL) != i);
for (i = IDA_BITMAP_BITS + BITS_PER_LONG - 4; i > 0; i--)
ida_free(ida, i - 1);
IDA_BUG_ON(ida, !ida_is_empty(ida));
}
static DEFINE_IDA(ida);
static int ida_checks(void)
{
IDA_BUG_ON(&ida, !ida_is_empty(&ida));
ida_check_alloc(&ida);
ida_check_destroy(&ida);
ida_check_leaf(&ida, 0);
ida_check_leaf(&ida, 1024);
ida_check_leaf(&ida, 1024 * 64);
ida_check_max(&ida);
ida_check_conv(&ida);
printk("IDA: %u of %u tests passed\n", tests_passed, tests_run);
return (tests_run != tests_passed) ? 0 : -EINVAL;
}
static void ida_exit(void)
{
}
module_init(ida_checks);
module_exit(ida_exit);
MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
MODULE_LICENSE("GPL");