Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable

[sfrench/cifs-2.6.git] / arch / blackfin / include / asm / mmu_context.h

diff --git a/arch/blackfin/include/asm/mmu_context.h b/arch/blackfin/include/asm/mmu_context.h
index 35593dda2a4d396d0bcbbaed982c2b2c5888812b..944e29faae48f4ba389450afe0d07e66a94b3cb5 100644 (file)
--- 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
 }