kernel_optimize_test/kernel/kcsan/atomic.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _KERNEL_KCSAN_ATOMIC_H
#define _KERNEL_KCSAN_ATOMIC_H

#include <linux/jiffies.h>

/*
 * Helper that returns true if access to @ptr should be considered an atomic
 * access, even though it is not explicitly atomic.
 *
 * List all volatile globals that have been observed in races, to suppress
 * data race reports between accesses to these variables.
 *
 * For now, we assume that volatile accesses of globals are as strong as atomic
 * accesses (READ_ONCE, WRITE_ONCE cast to volatile). The situation is still not
 * entirely clear, as on some architectures (Alpha) READ_ONCE/WRITE_ONCE do more
 * than cast to volatile. Eventually, we hope to be able to remove this
 * function.
 */
static __always_inline bool kcsan_is_atomic(const volatile void *ptr)
{
	/* only jiffies for now */
	return ptr == &jiffies;
}

#endif /* _KERNEL_KCSAN_ATOMIC_H */