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hc

2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/lib/lockref.c
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@@ -9,6 +9,7 @@
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  * failure case.
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  */
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 #define CMPXCHG_LOOP(CODE, SUCCESS) do {					\
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+	int retry = 100;							\
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 	struct lockref old;							\
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 	BUILD_BUG_ON(sizeof(old) != 8);						\
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 	old.lock_count = READ_ONCE(lockref->lock_count);			\
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@@ -21,6 +22,8 @@
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 		if (likely(old.lock_count == prev.lock_count)) {		\
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 			SUCCESS;						\
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 		}								\
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+		if (!--retry)							\
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+			break;							\
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 		cpu_relax();							\
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 	}									\
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 } while (0)