add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

 kernel/arch/arm/include/asm/mmu_context.h
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@@ -14,6 +14,7 @@
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 #include <linux/sched.h>
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 #include <linux/mm_types.h>
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 #include <linux/preempt.h>
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+#include <linux/irq_pipeline.h>
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 #include <asm/cacheflush.h>
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 #include <asm/cachetype.h>
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@@ -72,6 +73,7 @@
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 static inline void finish_arch_post_lock_switch(void)
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 {
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 	struct mm_struct *mm = current->mm;
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+	unsigned long flags;
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 	if (mm && mm->context.switch_pending) {
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 		/*
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@@ -83,7 +85,9 @@
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 		preempt_disable();
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 		if (mm->context.switch_pending) {
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 			mm->context.switch_pending = 0;
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+			protect_inband_mm(flags);
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 			cpu_switch_mm(mm->pgd, mm);
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+			unprotect_inband_mm(flags);
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 		}
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 		preempt_enable_no_resched();
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 	}
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@@ -102,7 +106,7 @@
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 #endif	/* CONFIG_CPU_HAS_ASID */
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 #define destroy_context(mm)		do { } while(0)
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-#define activate_mm(prev,next)		switch_mm(prev, next, NULL)
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+#define activate_mm(prev,next)		__switch_mm(prev, next, NULL)
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 /*
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  * This is called when "tsk" is about to enter lazy TLB mode.
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@@ -118,15 +122,9 @@
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 {
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 }
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-/*
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- * This is the actual mm switch as far as the scheduler
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- * is concerned.  No registers are touched.  We avoid
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- * calling the CPU specific function when the mm hasn't
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- * actually changed.
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- */
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 static inline void
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-switch_mm(struct mm_struct *prev, struct mm_struct *next,
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-	  struct task_struct *tsk)
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+__switch_mm(struct mm_struct *prev, struct mm_struct *next,
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+	    struct task_struct *tsk)
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 {
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 #ifdef CONFIG_MMU
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 	unsigned int cpu = smp_processor_id();
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@@ -149,6 +147,30 @@
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 #endif
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 }
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+/*
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+ * This is the actual mm switch as far as the scheduler
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+ * is concerned.  No registers are touched.  We avoid
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+ * calling the CPU specific function when the mm hasn't
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+ * actually changed.
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+ */
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+static inline void
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+switch_mm(struct mm_struct *prev, struct mm_struct *next,
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+	  struct task_struct *tsk)
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+{
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+	unsigned long flags;
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+
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+	protect_inband_mm(flags);
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+	__switch_mm(prev, next, tsk);
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+	unprotect_inband_mm(flags);
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+}
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+
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 #define deactivate_mm(tsk,mm)	do { } while (0)
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+static inline void
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+switch_oob_mm(struct mm_struct *prev, struct mm_struct *next,
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+	      struct task_struct *tsk)
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+{
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+	__switch_mm(prev, next, tsk);
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+}
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+
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 #endif