CRIS v10: Don't call get_mmu_context when switching between tasks with shared memory descriptors (4f073eff) · Commits · e / devices / android_kernel_xiaomi_markw

arch/cris/arch-v10/mm/tlb.c

+29 −29

Original line number	Diff line number	Diff line
		@@ -4,7 +4,7 @@
		* Low level TLB handling
		*
		*
		* Copyright (C) 2000-2002 Axis Communications AB
		* Copyright (C) 2000-2007 Axis Communications AB
		*
		* Authors: Bjorn Wesen (bjornw@axis.com)
		*
		@@ -39,7 +39,7 @@ flush_tlb_all(void)
		unsigned long flags;

		/* the vpn of i & 0xf is so we dont write similar TLB entries
		* in the same 4-way entry group. details..
		* in the same 4-way entry group. details...
		*/

		local_irq_save(flags);
		@@ -96,9 +96,7 @@ flush_tlb_mm(struct mm_struct *mm)

		/* invalidate a single page */

		void
		flush_tlb_page(struct vm_area_struct *vma,
		unsigned long addr)
		void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
		{
		struct mm_struct *mm = vma->vm_mm;
		int page_id = mm->context.page_id;
		@@ -172,12 +170,11 @@ init_new_context(struct task_struct tsk, struct mm_struct mm)

		/* called in schedule() just before actually doing the switch_to */

		void
		switch_mm(struct mm_struct prev, struct mm_struct next,
		void switch_mm(struct mm_struct prev, struct mm_struct next,
		struct task_struct *tsk)
		{
		if (prev != next) {
		/* make sure we have a context */

		get_mmu_context(next);

		/* remember the pgd for the fault handlers
		@@ -191,8 +188,11 @@ switch_mm(struct mm_struct prev, struct mm_struct next,

		/* switch context in the MMU */

		D(printk("switching mmu_context to %d (%p)\n", next->context, next));
		D(printk(KERN_DEBUG "switching mmu_context to %d (%p)\n",
		next->context, next));

		*R_MMU_CONTEXT = IO_FIELD(R_MMU_CONTEXT, page_id, next->context.page_id);
		*R_MMU_CONTEXT = IO_FIELD(R_MMU_CONTEXT,
		page_id, next->context.page_id);
		}
		}