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nds32: To simplify the implementation of update_mmu_cache() 

The checking code is done in kmap_atomic() so that we don't need to
check it in update_mmu_cache() again. There is no need to implement
it for cache aliasing or cache non-aliasing versions. We can just
implement one version for both.

Signed-off-by: Greentime Hu <greentime@andestech.com>
This commit is contained in:
Greentime Hu 2018-07-03 14:07:11 +08:00
parent 6897e6ecb3
commit bc9cb86e65
1 changed files with 8 additions and 39 deletions
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43
arch/nds32/mm/cacheflush.c
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@ -45,7 +45,7 @@ void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
flush_icache_range(kaddr, kaddr + len);
kunmap_atomic((void *)kaddr);
}
#ifndef CONFIG_CPU_CACHE_ALIASING
void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
pte_t * pte)
{
@ -67,19 +67,15 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
if ((test_and_clear_bit(PG_dcache_dirty, &page->flags)) ||
(vma->vm_flags & VM_EXEC)) {
if (!PageHighMem(page)) {
cpu_cache_wbinval_page((unsigned long)
page_address(page),
vma->vm_flags & VM_EXEC);
} else {
unsigned long kaddr = (unsigned long)kmap_atomic(page);
unsigned long kaddr;
local_irq_save(flags);
kaddr = (unsigned long)kmap_atomic(page);
cpu_cache_wbinval_page(kaddr, vma->vm_flags & VM_EXEC);
kunmap_atomic((void *)kaddr);
local_irq_restore(flags);
}
}
}
#else
#ifdef CONFIG_CPU_CACHE_ALIASING
extern pte_t va_present(struct mm_struct *mm, unsigned long addr);
static inline unsigned long aliasing(unsigned long addr, unsigned long page)
@ -349,31 +345,4 @@ void invalidate_kernel_vmap_range(void *addr, int size)
local_irq_restore(flags);
}
EXPORT_SYMBOL(invalidate_kernel_vmap_range);
void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
pte_t * pte)
{
struct page *page;
unsigned long flags;
unsigned long pfn = pte_pfn(*pte);
if (!pfn_valid(pfn))
return;
if (vma->vm_mm == current->active_mm) {
local_irq_save(flags);
__nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN);
__nds32__tlbop_rwr(*pte);
__nds32__isb();
local_irq_restore(flags);
}
page = pfn_to_page(pfn);
if (test_and_clear_bit(PG_dcache_dirty, &page->flags) ||
(vma->vm_flags & VM_EXEC)) {
local_irq_save(flags);
cpu_dcache_wbinval_page((unsigned long)page_address(page));
local_irq_restore(flags);
}
}
#endif