15  *   - The global context lock will not scale very well
18  *   - Implement flush_tlb_mm() by making the context stale and picking
93 /* Steal a context from a task that has one at the moment.
98  * This isn't an LRU system, it just frees up each context in
103  * For context stealing, we use a slightly different approach for
124 		if (mm->context.active) {  in steal_context_smp()
132 		/* Mark this mm has having no context anymore */  in steal_context_smp()
133 		mm->context.id = MMU_NO_CONTEXT;  in steal_context_smp()
177 		/* Mark this mm as having no context anymore */  in steal_all_contexts()
178 		mm->context.id = MMU_NO_CONTEXT;  in steal_all_contexts()
183 			mm->context.active = 0;  in steal_all_contexts()
216 	/* Flush the TLB for that context */  in steal_context_up()
219 	/* Mark this mm has having no context anymore */  in steal_context_up()
220 	mm->context.id = MMU_NO_CONTEXT;  in steal_context_up()
241 			pr_err("MMU: Context %d is %s and MM is %p !\n",  in context_check_map()
244 			nact += context_mm[id]->context.active;  in context_check_map()
247 		pr_err("MMU: Free context count out of sync ! (%d vs %d)\n",  in context_check_map()
255 		pr_err("MMU: Context 0 has been freed !!!\n");  in context_check_map()
273 	pr_hard("[%d] activating context for mm @%p, active=%d, id=%d",  in switch_mmu_context()
274 		cpu, next, next->context.active, next->context.id);  in switch_mmu_context()
278 	next->context.active++;  in switch_mmu_context()
280 		pr_hardcont(" (old=0x%p a=%d)", prev, prev->context.active);  in switch_mmu_context()
281 		WARN_ON(prev->context.active < 1);  in switch_mmu_context()
282 		prev->context.active--;  in switch_mmu_context()
288 	/* If we already have a valid assigned context, skip all that */  in switch_mmu_context()
289 	id = next->context.id;  in switch_mmu_context()
299 	/* We really don't have a context, let's try to acquire one */  in switch_mmu_context()
323 	/* We know there's at least one free context, try to find it */  in switch_mmu_context()
332 	next->context.id = id;  in switch_mmu_context()
338 	/* If that context got marked stale on this CPU, then flush the  in switch_mmu_context()
365  * Set up the context for a new address space.
369 	pr_hard("initing context for mm @%p\n", mm);  in init_new_context()
373 	 * explicitly against context.id == 0. This ensures that we properly  in init_new_context()
374 	 * initialize context slice details for newly allocated mm's (which will  in init_new_context()
375 	 * have id == 0) and don't alter context slice inherited via fork (which  in init_new_context()
378 	if (mm->context.id == 0)  in init_new_context()
380 	mm->context.id = MMU_NO_CONTEXT;  in init_new_context()
381 	mm->context.active = 0;  in init_new_context()
382 	pte_frag_set(&mm->context, NULL);  in init_new_context()
387  * We're finished using the context for an address space.
394 	if (mm->context.id == MMU_NO_CONTEXT)  in destroy_context()
397 	WARN_ON(mm->context.active != 0);  in destroy_context()
400 	id = mm->context.id;  in destroy_context()
403 		mm->context.id = MMU_NO_CONTEXT;  in destroy_context()
405 		mm->context.active = 0;  in destroy_context()
422 	pr_devel("MMU: Allocating stale context map for CPU %d\n", cpu);  in mmu_ctx_cpu_prepare()
433 	pr_devel("MMU: Freeing stale context map for CPU %d\n", cpu);  in mmu_ctx_cpu_dead()
446  * Initialize the context management stuff.
454 	init_mm.context.active = NR_CPUS;  in mmu_context_init()
457 	 * Allocate the maps used by context management  in mmu_context_init()
480 	       "MMU: Allocated %zu bytes of context maps for %d contexts\n",  in mmu_context_init()
486 	 * init_mm, and require using context 0 for a normal task.  in mmu_context_init()
487 	 * Other processors reserve the use of context zero for the kernel.  in mmu_context_init()