parisc: Fix cache rcu lock

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 288a25e1b1c29ec748df5bd55f1478631bd08223..edb8696612d0efa6a0f769e2b594d4ad9b855932 100644 (file)
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -522,8 +522,11 @@ static inline unsigned long mm_total_size(struct mm_struct *mm)
        unsigned long usize = 0;
        MA_STATE(mas, &mm->mm_mt, 0, 0);
 
+       rcu_read_lock();
        mas_for_each(&mas, vma, ULONG_MAX)
                usize += vma->vm_end - vma->vm_start;
+       rcu_read_unlock();
+
        return usize;
 }
 
@@ -562,16 +565,19 @@ void flush_cache_mm(struct mm_struct *mm)
        }
 
        if (mm->context == mfsp(3)) {
+               rcu_read_lock();
                mas_for_each(&mas, vma, ULONG_MAX) {
                        flush_user_dcache_range_asm(vma->vm_start, vma->vm_end);
                        if (vma->vm_flags & VM_EXEC)
                                flush_user_icache_range_asm(vma->vm_start, vma->vm_end);
                        flush_tlb_range(vma, vma->vm_start, vma->vm_end);
                }
+               rcu_read_unlock();
                return;
        }
 
        pgd = mm->pgd;
+       rcu_read_lock();
        mas_for_each(&mas, vma, ULONG_MAX) {
                unsigned long addr;
 
@@ -592,6 +598,7 @@ void flush_cache_mm(struct mm_struct *mm)
                        }
                }
        }
+       rcu_unread_lock();
 }
 
 void flush_cache_range(struct vm_area_struct *vma,