diff options
Diffstat (limited to 'arch/xtensa/mm/highmem.c')
| -rw-r--r-- | arch/xtensa/mm/highmem.c | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c index 184ceadccc1a..673196fe862e 100644 --- a/arch/xtensa/mm/highmem.c +++ b/arch/xtensa/mm/highmem.c @@ -37,29 +37,24 @@ static inline enum fixed_addresses kmap_idx(int type, unsigned long color) color; } -void *kmap_atomic(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { enum fixed_addresses idx; unsigned long vaddr; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - idx = kmap_idx(kmap_atomic_idx_push(), DCACHE_ALIAS(page_to_phys(page))); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(*(kmap_pte + idx))); #endif - set_pte(kmap_pte + idx, mk_pte(page, PAGE_KERNEL_EXEC)); + set_pte(kmap_pte + idx, mk_pte(page, prot)); return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high_prot); -void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { if (kvaddr >= (void *)FIXADDR_START && kvaddr < (void *)FIXADDR_TOP) { @@ -78,18 +73,19 @@ void __kunmap_atomic(void *kvaddr) kmap_atomic_idx_pop(); } - - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high); void __init kmap_init(void) { unsigned long kmap_vstart; + /* Check if this memory layout is broken because PKMAP overlaps + * page table. + */ + BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE); /* cache the first kmap pte */ kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); - kmap_pte = kmap_get_fixmap_pte(kmap_vstart); + kmap_pte = virt_to_kpte(kmap_vstart); kmap_waitqueues_init(); } |