powerpc/mm/64s/hash: Factor out change_memory_range()

Pull the loop calling hpte_updateboltedpp() out of
hash__change_memory_range() into a helper function. We need it to be a
separate function for the next patch.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210331003845.216246-4-mpe@ellerman.id.au

diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c
index 03819c2..3663d3c 100644 (file)
--- a/arch/powerpc/mm/book3s64/hash_pgtable.c
+++ b/arch/powerpc/mm/book3s64/hash_pgtable.c
@@ -400,10 +400,23 @@ EXPORT_SYMBOL_GPL(hash__has_transparent_hugepage);
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 #ifdef CONFIG_STRICT_KERNEL_RWX
+static void change_memory_range(unsigned long start, unsigned long end,
+                               unsigned int step, unsigned long newpp)
+{
+       unsigned long idx;
+
+       pr_debug("Changing page protection on range 0x%lx-0x%lx, to 0x%lx, step 0x%x\n",
+                start, end, newpp, step);
+
+       for (idx = start; idx < end; idx += step)
+               /* Not sure if we can do much with the return value */
+               mmu_hash_ops.hpte_updateboltedpp(newpp, idx, mmu_linear_psize,
+                                                       mmu_kernel_ssize);
+}
+
 static bool hash__change_memory_range(unsigned long start, unsigned long end,
                                      unsigned long newpp)
 {
-       unsigned long idx;
        unsigned int step, shift;
 
        shift = mmu_psize_defs[mmu_linear_psize].shift;
@@ -415,13 +428,7 @@ static bool hash__change_memory_range(unsigned long start, unsigned long end,
        if (start >= end)
                return false;
 
-       pr_debug("Changing page protection on range 0x%lx-0x%lx, to 0x%lx, step 0x%x\n",
-                start, end, newpp, step);
-
-       for (idx = start; idx < end; idx += step)
-               /* Not sure if we can do much with the return value */
-               mmu_hash_ops.hpte_updateboltedpp(newpp, idx, mmu_linear_psize,
-                                                       mmu_kernel_ssize);
+       change_memory_range(start, end, step, newpp);
 
        return true;
 }