[PATCH 5/7] riscv: Add fence to available_harts_lock

[Bin Meng]

On Tue, Sep 8, 2020 at 2:17 AM Sean Anderson <seanga2 at gmail.com> wrote:
>
> Without these fences, it is perfectly valid for an out-of-order core to
> re-order memory accesses to outside of the available_harts_lock critical
> section.

The commit message should be reworded, because current codes do
nothing wrong as "fence" instruction is used. What was done in this
patch is using .aq / .rl to replace "fence".

>
> Signed-off-by: Sean Anderson <seanga2 at gmail.com>
> ---
>
>  arch/riscv/cpu/start.S | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>

Regards,
Bin