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Commit 77b838fa authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: destroy_context() needs to disable interrupts. 



get_new_mmu_context() can be invoked from interrupt context
now for the new SMP version wrap handling.

So disable interrupt while taking ctx_alloc_lock in destroy_context()
so we don't deadlock.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a0663a79

arch/sparc64/mm/tsb.c

+3 −2
Original line number Diff line number Diff line
@@ -373,6 +373,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm) 
void destroy_context(struct mm_struct *mm)

{

	unsigned long size = mm->context.tsb_nentries * sizeof(struct tsb);

	unsigned long flags;



	free_pages((unsigned long) mm->context.tsb, get_order(size));
@@ -383,12 +384,12 @@ void destroy_context(struct mm_struct *mm) 
	mm->context.tsb = NULL;

	mm->context.tsb_reg_val = 0UL;



	spin_lock(&ctx_alloc_lock);

	spin_lock_irqsave(&ctx_alloc_lock, flags);



	if (CTX_VALID(mm->context)) {

		unsigned long nr = CTX_NRBITS(mm->context);

		mmu_context_bmap[nr>>6] &= ~(1UL << (nr & 63));

	}



	spin_unlock(&ctx_alloc_lock);

	spin_unlock_irqrestore(&ctx_alloc_lock, flags);

}