8af9942b43
Data corruptions in the kernel often end up in system crashes that are easier to debug closer to the time of detection. Specifically, if we do not panic immediately after lock or list corruptions have been detected, the problem context is lost in the ensuing system mayhem. Add support for BUG_ON immediately after such corruptions are detected. The CONFIG option controls the enabling/disabling of the feature. Change-Id: I9b2eb62da506a13007acff63e85e9515145909ff Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org> Signed-off-by: Patrick Daly <pdaly@codeaurora.org> Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_BUG_H
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#define _LINUX_BUG_H
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#include <asm/bug.h>
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#include <linux/compiler.h>
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#include <linux/build_bug.h>
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enum bug_trap_type {
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BUG_TRAP_TYPE_NONE = 0,
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BUG_TRAP_TYPE_WARN = 1,
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BUG_TRAP_TYPE_BUG = 2,
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};
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struct pt_regs;
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#ifdef __CHECKER__
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#define MAYBE_BUILD_BUG_ON(cond) (0)
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#else /* __CHECKER__ */
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#define MAYBE_BUILD_BUG_ON(cond) \
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do { \
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if (__builtin_constant_p((cond))) \
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BUILD_BUG_ON(cond); \
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else \
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BUG_ON(cond); \
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} while (0)
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#endif /* __CHECKER__ */
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#ifdef CONFIG_GENERIC_BUG
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#include <asm-generic/bug.h>
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static inline int is_warning_bug(const struct bug_entry *bug)
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{
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return bug->flags & BUGFLAG_WARNING;
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}
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struct bug_entry *find_bug(unsigned long bugaddr);
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enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
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/* These are defined by the architecture */
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int is_valid_bugaddr(unsigned long addr);
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void generic_bug_clear_once(void);
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#else /* !CONFIG_GENERIC_BUG */
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static inline enum bug_trap_type report_bug(unsigned long bug_addr,
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struct pt_regs *regs)
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{
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return BUG_TRAP_TYPE_BUG;
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}
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static inline void generic_bug_clear_once(void) {}
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#endif /* CONFIG_GENERIC_BUG */
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/*
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* Since detected data corruption should stop operation on the affected
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* structures. Return value must be checked and sanely acted on by caller.
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*/
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static inline __must_check bool check_data_corruption(bool v) { return v; }
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#define CHECK_DATA_CORRUPTION(condition, fmt, ...) \
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check_data_corruption(({ \
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bool corruption = unlikely(condition); \
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if (corruption) { \
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if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
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pr_err(fmt, ##__VA_ARGS__); \
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BUG(); \
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} else \
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WARN(1, fmt, ##__VA_ARGS__); \
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} \
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corruption; \
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}))
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#ifdef CONFIG_PANIC_ON_DATA_CORRUPTION
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#define PANIC_CORRUPTION 1
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#else
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#define PANIC_CORRUPTION 0
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#endif /* CONFIG_PANIC_ON_DATA_CORRUPTION */
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#endif /* _LINUX_BUG_H */
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