Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/kernel/arch/powerpc/include/asm/pgalloc-32.h b/kernel/arch/powerpc/include/asm/pgalloc-32.h
new file mode 100644
index 000000000..842846c1b
--- /dev/null
+++ b/kernel/arch/powerpc/include/asm/pgalloc-32.h
@@ -0,0 +1,91 @@
+#ifndef _ASM_POWERPC_PGALLOC_32_H
+#define _ASM_POWERPC_PGALLOC_32_H
+
+#include <linux/threads.h>
+
+/* For 32-bit, all levels of page tables are just drawn from get_free_page() */
+#define MAX_PGTABLE_INDEX_SIZE	0
+
+extern void __bad_pte(pmd_t *pmd);
+
+extern pgd_t *pgd_alloc(struct mm_struct *mm);
+extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
+
+/*
+ * We don't have any real pmd's, and this code never triggers because
+ * the pgd will always be present..
+ */
+/* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
+#define pmd_free(mm, x) 		do { } while (0)
+#define __pmd_free_tlb(tlb,x,a)		do { } while (0)
+/* #define pgd_populate(mm, pmd, pte)      BUG() */
+
+#ifndef CONFIG_BOOKE
+#define pmd_populate_kernel(mm, pmd, pte)	\
+		(pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
+#define pmd_populate(mm, pmd, pte)	\
+		(pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
+#define pmd_pgtable(pmd) pmd_page(pmd)
+#else
+#define pmd_populate_kernel(mm, pmd, pte)	\
+		(pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
+#define pmd_populate(mm, pmd, pte)	\
+		(pmd_val(*(pmd)) = (unsigned long)lowmem_page_address(pte) | _PMD_PRESENT)
+#define pmd_pgtable(pmd) pmd_page(pmd)
+#endif
+
+extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
+extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
+
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+	free_page((unsigned long)pte);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
+{
+	pgtable_page_dtor(ptepage);
+	__free_page(ptepage);
+}
+
+static inline void pgtable_free(void *table, unsigned index_size)
+{
+	BUG_ON(index_size); /* 32-bit doesn't use this */
+	free_page((unsigned long)table);
+}
+
+#define check_pgt_cache()	do { } while (0)
+
+#ifdef CONFIG_SMP
+static inline void pgtable_free_tlb(struct mmu_gather *tlb,
+				    void *table, int shift)
+{
+	unsigned long pgf = (unsigned long)table;
+	BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
+	pgf |= shift;
+	tlb_remove_table(tlb, (void *)pgf);
+}
+
+static inline void __tlb_remove_table(void *_table)
+{
+	void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
+	unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
+
+	pgtable_free(table, shift);
+}
+#else
+static inline void pgtable_free_tlb(struct mmu_gather *tlb,
+				    void *table, int shift)
+{
+	pgtable_free(table, shift);
+}
+#endif
+
+static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
+				  unsigned long address)
+{
+	tlb_flush_pgtable(tlb, address);
+	pgtable_page_dtor(table);
+	pgtable_free_tlb(tlb, page_address(table), 0);
+}
+#endif /* _ASM_POWERPC_PGALLOC_32_H */