disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/mmu_context.h
..
..
@@ -3,15 +3,23 @@
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 #define _LINUX_MMU_CONTEXT_H
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 #include <asm/mmu_context.h>
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-
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-struct mm_struct;
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-
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-void use_mm(struct mm_struct *mm);
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-void unuse_mm(struct mm_struct *mm);
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+#include <asm/mmu.h>
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 /* Architectures that care about IRQ state in switch_mm can override this. */
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 #ifndef switch_mm_irqs_off
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 # define switch_mm_irqs_off switch_mm
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 #endif
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+#ifndef leave_mm
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+static inline void leave_mm(int cpu) { }
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+#endif
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+
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+/*
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+ * CPUs that are capable of running task @p. By default, we assume a sane,
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+ * homogeneous system. Must contain at least one active CPU.
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+ */
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+#ifndef task_cpu_possible_mask
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+# define task_cpu_possible_mask(p)	cpu_possible_mask
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+#endif
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+
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 #endif