1 // SPDX-License-Identifier: GPL-2.0
29 	refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX - 1);  in lkdtm_REFCOUNT_INC_OVERFLOW()  local
32 	refcount_dec(&over);  in lkdtm_REFCOUNT_INC_OVERFLOW()
33 	refcount_inc(&over);  in lkdtm_REFCOUNT_INC_OVERFLOW()
36 	refcount_inc(&over);  in lkdtm_REFCOUNT_INC_OVERFLOW()
37 	refcount_inc(&over);  in lkdtm_REFCOUNT_INC_OVERFLOW()
39 	overflow_check(&over);  in lkdtm_REFCOUNT_INC_OVERFLOW()
45 	refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX - 1);  in lkdtm_REFCOUNT_ADD_OVERFLOW()  local
48 	refcount_dec(&over);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
49 	refcount_dec(&over);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
50 	refcount_dec(&over);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
51 	refcount_dec(&over);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
52 	refcount_add(4, &over);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
55 	refcount_add(4, &over);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
57 	overflow_check(&over);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
63 	refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX);  in lkdtm_REFCOUNT_INC_NOT_ZERO_OVERFLOW()  local
66 	if (!refcount_inc_not_zero(&over))  in lkdtm_REFCOUNT_INC_NOT_ZERO_OVERFLOW()
69 	overflow_check(&over);  in lkdtm_REFCOUNT_INC_NOT_ZERO_OVERFLOW()
75 	refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX);  in lkdtm_REFCOUNT_ADD_NOT_ZERO_OVERFLOW()  local
78 	if (!refcount_add_not_zero(6, &over))  in lkdtm_REFCOUNT_ADD_NOT_ZERO_OVERFLOW()
81 	overflow_check(&over);  in lkdtm_REFCOUNT_ADD_NOT_ZERO_OVERFLOW()
94 		pr_warn("Still at zero: refcount_inc/add() must not inc-from-0\n");  in check_zero()
103  * zero it should either saturate (when inc-from-zero isn't protected)
104  * or stay at zero (when inc-from-zero is protected) and should WARN for both.
123 	 * over-sub, so we have to track our starting position instead of  in check_negative()
124 	 * looking only at zero-pinning.  in check_negative()
127 		pr_warn("Still at %d: refcount_inc/add() must not inc-from-0\n",  in check_negative()
371 	for (i = 0; i < INT_MAX - 1; i++)  in lkdtm_ATOMIC_TIMING()
374 	for (i = INT_MAX; i > 0; i--)  in lkdtm_ATOMIC_TIMING()
379 		pr_err("atomic timing: out of sync up/down cycle: %u\n", i - 1);  in lkdtm_ATOMIC_TIMING()
388  *    cd /sys/kernel/debug/provoke-crash
389  *    perf stat -B -- cat <(echo REFCOUNT_TIMING) > DIRECT
396 	for (i = 0; i < INT_MAX - 1; i++)  in lkdtm_REFCOUNT_TIMING()
399 	for (i = INT_MAX; i > 0; i--)  in lkdtm_REFCOUNT_TIMING()
404 		pr_err("refcount: out of sync up/down cycle: %u\n", i - 1);  in lkdtm_REFCOUNT_TIMING()