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    Subject[PATCH 3.16 146/192] sparc64: Fix sparc64_set_context stack handling.
    3.16.49-rc1 review patch.  If anyone has any objections, please let me know.

    ------------------

    From: "David S. Miller" <davem@davemloft.net>

    [ Upstream commit 397d1533b6cce0ccb5379542e2e6d079f6936c46 ]

    Like a signal return, we should use synchronize_user_stack() rather
    than flush_user_windows().

    Reported-by: Ilya Malakhov <ilmalakhovthefirst@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    arch/sparc/kernel/signal_64.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/sparc/kernel/signal_64.c
    +++ b/arch/sparc/kernel/signal_64.c
    @@ -52,7 +52,7 @@ asmlinkage void sparc64_set_context(stru
    unsigned char fenab;
    int err;

    - flush_user_windows();
    + synchronize_user_stack();
    if (get_thread_wsaved() ||
    (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
    (!__access_ok(ucp, sizeof(*ucp))))
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