1 // SPDX-License-Identifier: GPL-2.0
19 		pr_err("Fail: refcount wrapped to %d\n", refcount_read(ref));  in overflow_check()
29 	refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX - 1);  in lkdtm_REFCOUNT_INC_OVERFLOW()
45 	refcount_t over = REFCOUNT_INIT(REFCOUNT_MAX - 1);  in lkdtm_REFCOUNT_ADD_OVERFLOW()
94 		pr_warn("Still at zero: refcount_inc/add() must not inc-from-0\n");  in check_zero()
97 		pr_err("Fail: refcount went crazy: %d\n", refcount_read(ref));  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()
140 		pr_err("Fail: refcount went crazy: %d\n", refcount_read(ref));  in check_negative()
198 		pr_info("Fail: zero not detected, incremented to %d\n",  in check_from_zero()
210 	pr_info("attempting safe refcount_inc_not_zero() from zero\n");  in lkdtm_REFCOUNT_INC_ZERO()
216 			pr_err("Fail: refcount went past zero!\n");  in lkdtm_REFCOUNT_INC_ZERO()
218 		pr_err("Fail: Zero not detected!?\n");  in lkdtm_REFCOUNT_INC_ZERO()
235 	pr_info("attempting safe refcount_add_not_zero() from zero\n");  in lkdtm_REFCOUNT_ADD_ZERO()
241 			pr_err("Fail: refcount went past zero\n");  in lkdtm_REFCOUNT_ADD_ZERO()
243 		pr_err("Fail: Zero not detected!?\n");  in lkdtm_REFCOUNT_ADD_ZERO()
262 		pr_err("Fail: refcount went crazy: %d\n", refcount_read(ref));  in check_saturated()
356 	for (i = 0; i < INT_MAX - 1; i++)  in lkdtm_ATOMIC_TIMING()
359 	for (i = INT_MAX; i > 0; i--)  in lkdtm_ATOMIC_TIMING()
364 		pr_err("atomic timing: out of sync up/down cycle: %u\n", i - 1);  in lkdtm_ATOMIC_TIMING()
373  *    cd /sys/kernel/debug/provoke-crash
374  *    perf stat -B -- cat <(echo REFCOUNT_TIMING) > DIRECT
381 	for (i = 0; i < INT_MAX - 1; i++)  in lkdtm_REFCOUNT_TIMING()
384 	for (i = INT_MAX; i > 0; i--)  in lkdtm_REFCOUNT_TIMING()
389 		pr_err("refcount: out of sync up/down cycle: %u\n", i - 1);  in lkdtm_REFCOUNT_TIMING()