C++ (Cpp) kpte_clear_flush Examples

Example #1

File: highmem_32-xen.c Project: AsadRaza/OCTEON-Linux

void kunmap_atomic(void *kvaddr, enum km_type type)
{
	unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
	enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();

	/*
	 * Force other mappings to Oops if they'll try to access this pte
	 * without first remap it.  Keeping stale mappings around is a bad idea
	 * also, in case the page changes cacheability attributes or becomes
	 * a protected page in a hypervisor.
	 */
	if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
		kpte_clear_flush(kmap_pte-idx, vaddr);
	else {
#ifdef CONFIG_DEBUG_HIGHMEM
		BUG_ON(vaddr < PAGE_OFFSET);
		BUG_ON(vaddr >= (unsigned long)high_memory);
#endif
	}

	pagefault_enable();
}

Example #2

File: process_32.c Project: olegsvs/android_kernel_ark_benefit_m7_mm

static void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
{
	int i;

	/*
	 * Clear @prev's kmap_atomic mappings
	 */
	for (i = 0; i < prev_p->kmap_idx; i++) {
		int idx = i + KM_TYPE_NR * smp_processor_id();
		pte_t *ptep = kmap_pte - idx;

		kpte_clear_flush(ptep, __fix_to_virt(FIX_KMAP_BEGIN + idx));
	}
	/*
	 * Restore @next_p's kmap_atomic mappings
	 */
	for (i = 0; i < next_p->kmap_idx; i++) {
		int idx = i + KM_TYPE_NR * smp_processor_id();

		if (!pte_none(next_p->kmap_pte[i]))
			set_pte(kmap_pte - idx, next_p->kmap_pte[i]);
	}
}

Example #3

File: highmem_32.c Project: ExorEmbedded/linux-us03

void __kunmap_atomic(void *kvaddr)
{
	unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;

	if (vaddr >= __fix_to_virt(FIX_KMAP_END) &&
	    vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) {
		int idx, type;

		type = kmap_atomic_idx();
		idx = type + KM_TYPE_NR * smp_processor_id();

#ifdef CONFIG_DEBUG_HIGHMEM
		WARN_ON_ONCE(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.  Keeping stale mappings around
		 * is a bad idea also, in case the page changes cacheability
		 * attributes or becomes a protected page in a hypervisor.
		 */
#ifdef CONFIG_PREEMPT_RT_FULL
		current->kmap_pte[type] = __pte(0);
#endif
		kpte_clear_flush(kmap_pte-idx, vaddr);
		kmap_atomic_idx_pop();
		arch_flush_lazy_mmu_mode();
	}
#ifdef CONFIG_DEBUG_HIGHMEM
	else {
		BUG_ON(vaddr < PAGE_OFFSET);
		BUG_ON(vaddr >= (unsigned long)high_memory);
	}
#endif

	pagefault_enable();
}