15  *   - The global context lock will not scale very well
18  *   - Implement flush_tlb_mm() by making the context stale and picking
82 /* Steal a context from a task that has one at the moment.
87  * This isn't an LRU system, it just frees up each context in
92  * For context stealing, we use a slightly different approach for
112 		if (mm->context.active) {  in steal_context_smp()
119 		/* Mark this mm has having no context anymore */  in steal_context_smp()
120 		mm->context.id = MMU_NO_CONTEXT;  in steal_context_smp()
159 		/* Mark this mm as having no context anymore */  in steal_all_contexts()
160 		mm->context.id = MMU_NO_CONTEXT;  in steal_all_contexts()
190 	/* Flush the TLB for that context */  in steal_context_up()
193 	/* Mark this mm has having no context anymore */  in steal_context_up()
194 	mm->context.id = MMU_NO_CONTEXT;  in steal_context_up()
208 		/* Update context */  in set_context()
231 		next->context.active++;  in switch_mmu_context()
233 			WARN_ON(prev->context.active < 1);  in switch_mmu_context()
234 			prev->context.active--;  in switch_mmu_context()
240 	/* If we already have a valid assigned context, skip all that */  in switch_mmu_context()
241 	id = next->context.id;  in switch_mmu_context()
245 	/* We really don't have a context, let's try to acquire one */  in switch_mmu_context()
267 	/* We know there's at least one free context, try to find it */  in switch_mmu_context()
276 	next->context.id = id;  in switch_mmu_context()
280 	/* If that context got marked stale on this CPU, then flush the  in switch_mmu_context()
305  * Set up the context for a new address space.
309 	mm->context.id = MMU_NO_CONTEXT;  in init_new_context()
310 	mm->context.active = 0;  in init_new_context()
311 	pte_frag_set(&mm->context, NULL);  in init_new_context()
316  * We're finished using the context for an address space.
323 	if (mm->context.id == MMU_NO_CONTEXT)  in destroy_context()
326 	WARN_ON(mm->context.active != 0);  in destroy_context()
329 	id = mm->context.id;  in destroy_context()
332 		mm->context.id = MMU_NO_CONTEXT;  in destroy_context()
367  * Initialize the context management stuff.
375 	init_mm.context.active = NR_CPUS;  in mmu_context_init()
378 	 * Allocate the maps used by context management  in mmu_context_init()
391 	       "MMU: Allocated %zu bytes of context maps for %d contexts\n",  in mmu_context_init()
397 	 * init_mm, and require using context 0 for a normal task.  in mmu_context_init()
398 	 * Other processors reserve the use of context zero for the kernel.  in mmu_context_init()