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    Subject[PATCH 4.4 13/90] sparc64: combine activate_mm and switch_mm
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

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

    From: Pavel Tatashin <pasha.tatashin@oracle.com>


    [ Upstream commit 14d0334c6748ff2aedb3f2f7fdc51ee90a9b54e7 ]

    The only difference between these two functions is that in activate_mm we
    unconditionally flush context. However, there is no need to keep this
    difference after fixing a bug where cpumask was not reset on a wrap. So, in
    this patch we combine these.

    Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
    Reviewed-by: Bob Picco <bob.picco@oracle.com>
    Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/sparc/include/asm/mmu_context_64.h | 21 +--------------------
    1 file changed, 1 insertion(+), 20 deletions(-)

    --- a/arch/sparc/include/asm/mmu_context_64.h
    +++ b/arch/sparc/include/asm/mmu_context_64.h
    @@ -131,26 +131,7 @@ static inline void switch_mm(struct mm_s
    }

    #define deactivate_mm(tsk,mm) do { } while (0)
    -
    -/* Activate a new MM instance for the current task. */
    -static inline void activate_mm(struct mm_struct *active_mm, struct mm_struct *mm)
    -{
    - unsigned long flags;
    - int cpu;
    -
    - spin_lock_irqsave(&mm->context.lock, flags);
    - if (!CTX_VALID(mm->context))
    - get_new_mmu_context(mm);
    - cpu = smp_processor_id();
    - if (!cpumask_test_cpu(cpu, mm_cpumask(mm)))
    - cpumask_set_cpu(cpu, mm_cpumask(mm));
    -
    - load_secondary_context(mm);
    - __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT);
    - tsb_context_switch(mm);
    - spin_unlock_irqrestore(&mm->context.lock, flags);
    -}
    -
    +#define activate_mm(active_mm, mm) switch_mm(active_mm, mm, NULL)
    #endif /* !(__ASSEMBLY__) */

    #endif /* !(__SPARC64_MMU_CONTEXT_H) */

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