MIPS: mm: Remove redundant preempt_disable in local_flush_tlb_mm()

The r4k variant of local_flush_tlb_mm() wraps its call to
drop_mmu_context() with a preempt_disable() & preempt_enable() pair, but
this is redundant since drop_mmu_context() disables interrupts and from
Documentation/preempt-locking.txt:

  Note that you do not need to explicitly prevent preemption if you are
  holding any locks or interrupts are disabled, since preemption is
  implicitly disabled in those cases.

Remove the redundant preempt_disable() & preempt_enable() calls.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org

diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c
index ba76b0c11d38f566b5631dfd84ecd3c5a3295dac..9fff08eabe8fc059b27640d28927fada3a52524c 100644 (file)
--- a/arch/mips/mm/tlb-r4k.c
+++ b/arch/mips/mm/tlb-r4k.c
@@ -108,9 +108,7 @@ EXPORT_SYMBOL(local_flush_tlb_all);
    these entries, we just bump the asid. */
 void local_flush_tlb_mm(struct mm_struct *mm)
 {
-       preempt_disable();
        drop_mmu_context(mm);
-       preempt_enable();
 }
 
 void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,