Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm64 / mm / pgd.c

diff --git a/kernel/arch/arm64/mm/pgd.c b/kernel/arch/arm64/mm/pgd.c
new file mode 100644 (file)
index 0000000..71ca104
--- /dev/null
+++ b/kernel/arch/arm64/mm/pgd.c
@@ -0,0 +1,61 @@
+/*
+ * PGD allocation/freeing
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/mm.h>
+#include <linux/gfp.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+
+#include <asm/pgalloc.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+
+#include "mm.h"
+
+#define PGD_SIZE       (PTRS_PER_PGD * sizeof(pgd_t))
+
+static struct kmem_cache *pgd_cache;
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+       if (PGD_SIZE == PAGE_SIZE)
+               return (pgd_t *)__get_free_page(PGALLOC_GFP);
+       else
+               return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
+}
+
+void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+       if (PGD_SIZE == PAGE_SIZE)
+               free_page((unsigned long)pgd);
+       else
+               kmem_cache_free(pgd_cache, pgd);
+}
+
+static int __init pgd_cache_init(void)
+{
+       /*
+        * Naturally aligned pgds required by the architecture.
+        */
+       if (PGD_SIZE != PAGE_SIZE)
+               pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE,
+                                             SLAB_PANIC, NULL);
+       return 0;
+}
+core_initcall(pgd_cache_init);