| From | Greg Kroah-Hartman <> | Subject | [ 12/45] sparc: tsb must be flushed before tlb | Date | Fri, 26 Jul 2013 13:57:32 -0700 |
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3.0-stable review patch. If anyone has any objections, please let me know.
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From: Dave Kleikamp <dave.kleikamp@oracle.com>
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/sparc/mm/tlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/sparc/mm/tlb.c +++ b/arch/sparc/mm/tlb.c @@ -115,8 +115,8 @@ no_cache_flush: } if (!tb->active) { - global_flush_tlb_page(mm, vaddr); flush_tsb_user_page(mm, vaddr); + global_flush_tlb_page(mm, vaddr); goto out; }
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