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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#ifndef _ZINC_SELFTEST_RUN_H
#define _ZINC_SELFTEST_RUN_H
#include <linux/kernel.h>
#include <linux/printk.h>
#include <linux/bug.h>
static inline bool selftest_run(const char *name, bool (*selftest)(void),
bool *const nobs[], unsigned int nobs_len)
{
unsigned long set = 0, subset = 0, largest_subset = 0;
unsigned int i;
BUILD_BUG_ON(!__builtin_constant_p(nobs_len) ||
nobs_len >= BITS_PER_LONG);
if (!IS_ENABLED(CONFIG_ZINC_SELFTEST))
return true;
for (i = 0; i < nobs_len; ++i)
set |= ((unsigned long)*nobs[i]) << i;
do {
for (i = 0; i < nobs_len; ++i)
*nobs[i] = BIT(i) & subset;
if (selftest())
largest_subset = max(subset, largest_subset);
else
pr_err("%s self-test combination 0x%lx: FAIL\n", name,
subset);
subset = (subset - set) & set;
} while (subset);
for (i = 0; i < nobs_len; ++i)
*nobs[i] = BIT(i) & largest_subset;
if (largest_subset == set)
pr_info("%s self-tests: pass\n", name);
return !WARN_ON(largest_subset != set);
}
#endif
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