[PATCH] hugepage: is_aligned_hugepage_range() cleanup

[powerpc.git] / arch / powerpc / mm / tlb_32.c

diff --git a/arch/powerpc/mm/tlb_32.c b/arch/powerpc/mm/tlb_32.c
index 6c3dc3c..ad580f3 100644 (file)
--- a/arch/powerpc/mm/tlb_32.c
+++ b/arch/powerpc/mm/tlb_32.c
@@ -149,6 +149,12 @@ void flush_tlb_mm(struct mm_struct *mm)
                return;
        }
 
+       /*
+        * It is safe to go down the mm's list of vmas when called
+        * from dup_mmap, holding mmap_sem.  It would also be safe from
+        * unmap_region or exit_mmap, but not from vmtruncate on SMP -
+        * but it seems dup_mmap is the only SMP case which gets here.
+        */
        for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
                flush_range(mp->vm_mm, mp->vm_start, mp->vm_end);
        FINISH_FLUSH;