#include <linux/compiler.h>
#include <asm/cacheflush.h>
#include <asm/proc-fns.h>
+#include <asm-generic/mm_hooks.h>
-#if __LINUX_ARM_ARCH__ >= 6
+void __check_kvm_seq(struct mm_struct *mm);
+
+#ifdef CONFIG_CPU_HAS_ASID
/*
* On ARMv6, we have the following structure in the Context ID:
* The context ID is used by debuggers and trace logic, and
* should be unique within all running processes.
*/
-#define ASID_BITS 8
-#define ASID_MASK ((~0) << ASID_BITS)
+#define ASID_BITS 8
+#define ASID_MASK ((~0) << ASID_BITS)
+#define ASID_FIRST_VERSION (1 << ASID_BITS)
extern unsigned int cpu_last_asid;
{
if (unlikely((mm->context.id ^ cpu_last_asid) >> ASID_BITS))
__new_context(mm);
+
+ if (unlikely(mm->context.kvm_seq != init_mm.context.kvm_seq))
+ __check_kvm_seq(mm);
}
#define init_new_context(tsk,mm) (__init_new_context(tsk,mm),0)
#else
-#define check_context(mm) do { } while (0)
+static inline void check_context(struct mm_struct *mm)
+{
+ if (unlikely(mm->context.kvm_seq != init_mm.context.kvm_seq))
+ __check_kvm_seq(mm);
+}
+
#define init_new_context(tsk,mm) 0
#endif
switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
+#ifdef CONFIG_MMU
unsigned int cpu = smp_processor_id();
- if (prev != next) {
- cpu_set(cpu, next->cpu_vm_mask);
+ if (!cpu_test_and_set(cpu, next->cpu_vm_mask) || prev != next) {
check_context(next);
cpu_switch_mm(next->pgd, next);
if (cache_is_vivt())
cpu_clear(cpu, prev->cpu_vm_mask);
}
+#endif
}
#define deactivate_mm(tsk,mm) do { } while (0)