Commit 23a01138 authored Jun 18, 2013 by Dave Kleikamp Committed by David S. Miller Jun 19, 2013

sparc: tsb must be flushed before tlb



This fixes a race where a cpu may re-load a tlb from a stale tsb right
after it has been flushed by a remote function call.

I still see some instability when stressing the system with parallel
kernel builds while creating memory pressure by writing to
/proc/sys/vm/nr_hugepages, but this patch improves the stability
significantly.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Acked-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent f670758f

arch/sparc/mm/tlb.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -85,8 +85,8 @@ static void tlb_batch_add_one(struct mm_struct *mm, unsigned long vaddr,
		}

		if (!tb->active) {
		global_flush_tlb_page(mm, vaddr);
		flush_tsb_user_page(mm, vaddr);
		global_flush_tlb_page(mm, vaddr);
		goto out;
		}