Commit 28ee5809 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc 

Pull sparc fix from David Miller:
 "Sparc32 locking bug fix from Andreas Larsson"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc32: destroy_context() and switch_mm() needs to disable interrupts.
parents 22943a6a 66d0f7ec

arch/sparc/mm/srmmu.c

+7 −4
Original line number Diff line number Diff line
@@ -460,10 +460,12 @@ static void __init sparc_context_init(int numctx) 
void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm,

	       struct task_struct *tsk)

{

	unsigned long flags;



	if (mm->context == NO_CONTEXT) {

		spin_lock(&srmmu_context_spinlock);

		spin_lock_irqsave(&srmmu_context_spinlock, flags);

		alloc_context(old_mm, mm);

		spin_unlock(&srmmu_context_spinlock);

		spin_unlock_irqrestore(&srmmu_context_spinlock, flags);

		srmmu_ctxd_set(&srmmu_context_table[mm->context], mm->pgd);

	}
@@ -986,14 +988,15 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm) 


void destroy_context(struct mm_struct *mm)

{

	unsigned long flags;



	if (mm->context != NO_CONTEXT) {

		flush_cache_mm(mm);

		srmmu_ctxd_set(&srmmu_context_table[mm->context], srmmu_swapper_pg_dir);

		flush_tlb_mm(mm);

		spin_lock(&srmmu_context_spinlock);

		spin_lock_irqsave(&srmmu_context_spinlock, flags);

		free_context(mm->context);

		spin_unlock(&srmmu_context_spinlock);

		spin_unlock_irqrestore(&srmmu_context_spinlock, flags);

		mm->context = NO_CONTEXT;

	}

}