[PATCH 0/2] arm64: TLB flush issues

Steve Capper steve.capper at linaro.org
Fri May 2 08:30:21 PDT 2014

On Fri, May 02, 2014 at 11:20:33AM -0400, Mark Salter wrote:
> As explained in more detail in the second patch, I have observed a soft
> lockup under some loads. These lockups were in flush_tlb_kernel_range()
> which was looping through a very large address range. While looking into
> this, I also noticed the flush routines in tlb.S were not properly
> handling pages larger than 4k. This is corrected in the first patch.
> The second patch limits the loop size for the flush_tlb_[kernel_]range
> functions. It uses an arbitrary constant to limit the loop, but it
> would be better if it were based on actual tlb size or some other
> heuristic.
> Mark Salter (2):
>   arm64: fix unnecessary tlb flushes
>   arm64: fix soft lockup due to large tlb flush range
>  arch/arm64/include/asm/tlbflush.h | 28 +++++++++++++++++++++++++---
>  arch/arm64/mm/tlb.S               |  4 ++--
>  2 files changed, 27 insertions(+), 5 deletions(-)

Hi Mark,
As a heads-up, I posted this earlier today:


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