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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>
This commit is contained in:
Dave Kleikamp 2013-06-18 09:05:36 -05:00 committed by David S. Miller
parent f670758f5b
commit 23a01138ef
1 changed files with 1 additions and 1 deletions
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2
arch/sparc/mm/tlb.c
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@ -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;
}