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CRIS v10: Don't call get_mmu_context when switching between tasks with shared memory descriptors 

Also, cleanup formatting and fix whitespace errors.
hifive-unleashed-5.1
Jesper Nilsson 2008-01-21 11:28:16 +01:00
parent 40316c1fad
commit 4f073eff3f
1 changed files with 29 additions and 29 deletions
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58
arch/cris/arch-v10/mm/tlb.c
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@ -4,8 +4,8 @@
* 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);
@ -47,7 +47,7 @@ flush_tlb_all(void)
*R_TLB_SELECT = ( IO_FIELD(R_TLB_SELECT, index, i) );
*R_TLB_HI = ( IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) |
IO_FIELD(R_TLB_HI, vpn, i & 0xf ) );
*R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) |
IO_STATE(R_TLB_LO, valid, no ) |
IO_STATE(R_TLB_LO, kernel,no ) |
@ -71,10 +71,10 @@ flush_tlb_mm(struct mm_struct *mm)
if(page_id == NO_CONTEXT)
return;
/* mark the TLB entries that match the page_id as invalid.
* here we could also check the _PAGE_GLOBAL bit and NOT flush
* global pages. is it worth the extra I/O ?
* global pages. is it worth the extra I/O ?
*/
local_irq_save(flags);
@ -83,7 +83,7 @@ flush_tlb_mm(struct mm_struct *mm)
if (IO_EXTRACT(R_TLB_HI, page_id, *R_TLB_HI) == page_id) {
*R_TLB_HI = ( IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) |
IO_FIELD(R_TLB_HI, vpn, i & 0xf ) );
*R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) |
IO_STATE(R_TLB_LO, valid, no ) |
IO_STATE(R_TLB_LO, kernel,no ) |
@ -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;
@ -113,7 +111,7 @@ flush_tlb_page(struct vm_area_struct *vma,
addr &= PAGE_MASK; /* perhaps not necessary */
/* invalidate those TLB entries that match both the mm context
* and the virtual address requested
* and the virtual address requested
*/
local_irq_save(flags);
@ -125,7 +123,7 @@ flush_tlb_page(struct vm_area_struct *vma,
(tlb_hi & PAGE_MASK) == addr) {
*R_TLB_HI = IO_FIELD(R_TLB_HI, page_id, INVALID_PAGEID ) |
addr; /* same addr as before works. */
*R_TLB_LO = ( IO_STATE(R_TLB_LO, global,no ) |
IO_STATE(R_TLB_LO, valid, no ) |
IO_STATE(R_TLB_LO, kernel,no ) |
@ -144,7 +142,7 @@ dump_tlb_all(void)
{
int i;
unsigned long flags;
printk("TLB dump. LO is: pfn | reserved | global | valid | kernel | we |\n");
local_save_flags(flags);
@ -172,27 +170,29 @@ 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,
struct task_struct *tsk)
void switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
/* make sure we have a context */
if (prev != next) {
/* make sure we have a context */
get_mmu_context(next);
get_mmu_context(next);
/* remember the pgd for the fault handlers
* this is similar to the pgd register in some other CPU's.
* we need our own copy of it because current and active_mm
* might be invalid at points where we still need to derefer
* the pgd.
*/
/* remember the pgd for the fault handlers
* this is similar to the pgd register in some other CPU's.
* we need our own copy of it because current and active_mm
* might be invalid at points where we still need to derefer
* the pgd.
*/
per_cpu(current_pgd, smp_processor_id()) = next->pgd;
per_cpu(current_pgd, smp_processor_id()) = next->pgd;
/* switch context in the MMU */
/* 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);
}
}