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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Special rules for ignoring entire classes of data-racy memory accesses. None
* of the rules here imply that such data races are generally safe!
*
* All rules in this file can be configured via CONFIG_KCSAN_PERMISSIVE. Keep
* them separate from core code to make it easier to audit.
*
* Copyright (C) 2019, Google LLC.
*/
#ifndef _KERNEL_KCSAN_PERMISSIVE_H
#define _KERNEL_KCSAN_PERMISSIVE_H
#include <linux/types.h>
/*
* Access ignore rules based on address.
*/
static __always_inline bool kcsan_ignore_address(const volatile void *ptr)
{
if (!IS_ENABLED(CONFIG_KCSAN_PERMISSIVE))
return false;
return false;
}
/*
* Data race ignore rules based on access type and value change patterns.
*/
static bool
kcsan_ignore_data_race(size_t size, int type, u64 old, u64 new, u64 diff)
{
if (!IS_ENABLED(CONFIG_KCSAN_PERMISSIVE))
return false;
/*
* Rules here are only for plain read accesses, so that we still report
* data races between plain read-write accesses.
*/
if (type || size > sizeof(long))
return false;
return false;
}
#endif /* _KERNEL_KCSAN_PERMISSIVE_H */
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