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microblaze: mm: Flush TLB to ensure correct mapping when higmem ON 

MMU contains invalid mapping which wasn't flushed and new mapping
is using the same addresses as previous one. That's why TLB miss is not
happening to get new correct TLB entry and MMU points to incorrect area.

This is replicatable when large files(256MB and more) are copied and
checked.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2016-01-13 19:37:25 +01:00
parent 83f0124ad8
commit a753499d43
1 changed files with 11 additions and 13 deletions
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24
arch/microblaze/mm/highmem.c
View File

@ -60,6 +60,7 @@ void __kunmap_atomic(void *kvaddr)
{
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
int type;
unsigned int idx;
if (vaddr < __fix_to_virt(FIX_KMAP_END)) {
pagefault_enable();
@ -68,21 +69,18 @@ void __kunmap_atomic(void *kvaddr)
}
type = kmap_atomic_idx();
idx = type + KM_TYPE_NR * smp_processor_id();
#ifdef CONFIG_DEBUG_HIGHMEM
{
unsigned int idx;
idx = type + KM_TYPE_NR * smp_processor_id();
BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
/*
* force other mappings to Oops if they'll try to access
* this pte without first remap it
*/
pte_clear(&init_mm, vaddr, kmap_pte-idx);
local_flush_tlb_page(NULL, vaddr);
}
BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
#endif
/*
* force other mappings to Oops if they'll try to access
* this pte without first remap it
*/
pte_clear(&init_mm, vaddr, kmap_pte-idx);
local_flush_tlb_page(NULL, vaddr);
kmap_atomic_idx_pop();
pagefault_enable();
preempt_enable();