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59 lines
1.6 KiB
59 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_KCSAN_H |
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#define _LINUX_KCSAN_H |
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#include <linux/kcsan-checks.h> |
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#include <linux/types.h> |
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#ifdef CONFIG_KCSAN |
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/* |
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* Context for each thread of execution: for tasks, this is stored in |
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* task_struct, and interrupts access internal per-CPU storage. |
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*/ |
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struct kcsan_ctx { |
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int disable_count; /* disable counter */ |
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int atomic_next; /* number of following atomic ops */ |
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/* |
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* We distinguish between: (a) nestable atomic regions that may contain |
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* other nestable regions; and (b) flat atomic regions that do not keep |
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* track of nesting. Both (a) and (b) are entirely independent of each |
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* other, and a flat region may be started in a nestable region or |
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* vice-versa. |
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* |
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* This is required because, for example, in the annotations for |
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* seqlocks, we declare seqlock writer critical sections as (a) nestable |
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* atomic regions, but reader critical sections as (b) flat atomic |
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* regions, but have encountered cases where seqlock reader critical |
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* sections are contained within writer critical sections (the opposite |
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* may be possible, too). |
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* |
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* To support these cases, we independently track the depth of nesting |
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* for (a), and whether the leaf level is flat for (b). |
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*/ |
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int atomic_nest_count; |
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bool in_flat_atomic; |
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/* |
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* Access mask for all accesses if non-zero. |
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*/ |
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unsigned long access_mask; |
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/* List of scoped accesses. */ |
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struct list_head scoped_accesses; |
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}; |
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/** |
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* kcsan_init - initialize KCSAN runtime |
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*/ |
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void kcsan_init(void); |
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#else /* CONFIG_KCSAN */ |
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static inline void kcsan_init(void) { } |
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#endif /* CONFIG_KCSAN */ |
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#endif /* _LINUX_KCSAN_H */
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