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Diffstat (limited to 'arch/blackfin/include/asm/mmu_context.h')
-rw-r--r--arch/blackfin/include/asm/mmu_context.h27
1 files changed, 19 insertions, 8 deletions
diff --git a/arch/blackfin/include/asm/mmu_context.h b/arch/blackfin/include/asm/mmu_context.h
index 35593dda2a4d..944e29faae48 100644
--- a/arch/blackfin/include/asm/mmu_context.h
+++ b/arch/blackfin/include/asm/mmu_context.h
@@ -37,6 +37,10 @@
#include <asm/pgalloc.h>
#include <asm/cplbinit.h>
+/* Note: L1 stacks are CPU-private things, so we bluntly disable this
+ feature in SMP mode, and use the per-CPU scratch SRAM bank only to
+ store the PDA instead. */
+
extern void *current_l1_stack_save;
extern int nr_l1stack_tasks;
extern void *l1_stack_base;
@@ -88,12 +92,15 @@ activate_l1stack(struct mm_struct *mm, unsigned long sp_base)
static inline void switch_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm,
struct task_struct *tsk)
{
+#ifdef CONFIG_MPU
+ unsigned int cpu = smp_processor_id();
+#endif
if (prev_mm == next_mm)
return;
#ifdef CONFIG_MPU
- if (prev_mm->context.page_rwx_mask == current_rwx_mask) {
- flush_switched_cplbs();
- set_mask_dcplbs(next_mm->context.page_rwx_mask);
+ if (prev_mm->context.page_rwx_mask == current_rwx_mask[cpu]) {
+ flush_switched_cplbs(cpu);
+ set_mask_dcplbs(next_mm->context.page_rwx_mask, cpu);
}
#endif
@@ -138,9 +145,10 @@ static inline void protect_page(struct mm_struct *mm, unsigned long addr,
static inline void update_protections(struct mm_struct *mm)
{
- if (mm->context.page_rwx_mask == current_rwx_mask) {
- flush_switched_cplbs();
- set_mask_dcplbs(mm->context.page_rwx_mask);
+ unsigned int cpu = smp_processor_id();
+ if (mm->context.page_rwx_mask == current_rwx_mask[cpu]) {
+ flush_switched_cplbs(cpu);
+ set_mask_dcplbs(mm->context.page_rwx_mask, cpu);
}
}
#endif
@@ -165,6 +173,9 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
static inline void destroy_context(struct mm_struct *mm)
{
struct sram_list_struct *tmp;
+#ifdef CONFIG_MPU
+ unsigned int cpu = smp_processor_id();
+#endif
#ifdef CONFIG_APP_STACK_L1
if (current_l1_stack_save == mm->context.l1_stack_save)
@@ -179,8 +190,8 @@ static inline void destroy_context(struct mm_struct *mm)
kfree(tmp);
}
#ifdef CONFIG_MPU
- if (current_rwx_mask == mm->context.page_rwx_mask)
- current_rwx_mask = NULL;
+ if (current_rwx_mask[cpu] == mm->context.page_rwx_mask)
+ current_rwx_mask[cpu] = NULL;
free_pages((unsigned long)mm->context.page_rwx_mask, page_mask_order);
#endif
}