From a31b9dd8edc6e4e75b5299fee6093b3c54548446 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 10 Apr 2008 16:10:45 +0100 Subject: [PATCH] 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 Signed-off-by: Linus Torvalds --- include/asm-frv/pgtable.h | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/include/asm-frv/pgtable.h b/include/asm-frv/pgtable.h index 6c0682ed5fc9..4e219046fe42 100644 --- a/include/asm-frv/pgtable.h +++ b/include/asm-frv/pgtable.h @@ -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); - 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; + 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; + } else { + address = ULONG_MAX; + ampr = 0; + } asm volatile("movgs %0,scr0\n" "movgs %0,scr1\n" -- 2.20.1