Commit a31b9dd8 authored Apr 10, 2008 by David Howells Committed by Linus Torvalds Apr 10, 2008

FRV: Handle update_mmu_cache() being called when current->mm is NULL [try #2]

Handle update_mmu_cache() being called when current->mm is NULL.

We cache static TLB mappings for the current page table in DAMPR4 and DAMPR5
on the theory that the next data lookup is likely to be in the same general
region, and thus is likely to be mapped by the same page table. However, we
can't get this information if we can't access the appropriate mm_struct.

If current->mm is NULL, we just clear the cache in the knowledge that the TLB
miss handlers will load it.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 5d69a029

include/asm-frv/pgtable.h

+14 −5

Original line number	Diff line number	Diff line
		@@ -507,13 +507,22 @@ static inline int pte_file(pte_t pte)
		*/
		static inline void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
		{
		struct mm_struct *mm;
		unsigned long ampr;
		pgd_t *pge = pgd_offset(current->mm, address);

		mm = current->mm;
		if (mm) {
		pgd_t *pge = pgd_offset(mm, address);
		pud_t *pue = pud_offset(pge, address);
		pmd_t *pme = pmd_offset(pue, address);

		ampr = pme->ste[0] & 0xffffff00;
		ampr \|= xAMPRx_L \| xAMPRx_SS_16Kb \| xAMPRx_S \| xAMPRx_C \| xAMPRx_V;
		ampr \|= xAMPRx_L \| xAMPRx_SS_16Kb \| xAMPRx_S \| xAMPRx_C \|
		xAMPRx_V;
		} else {
		address = ULONG_MAX;
		ampr = 0;
		}

		asm volatile("movgs %0,scr0\n"
		"movgs %0,scr1\n"

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