Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/tlb.h b/arch/ia64/include/asm/tlb.h
new file mode 100644
index 000000000..a15fe0809
--- /dev/null
+++ b/arch/ia64/include/asm/tlb.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_IA64_TLB_H
+#define _ASM_IA64_TLB_H
+/*
+ * Based on <asm-generic/tlb.h>.
+ *
+ * Copyright (C) 2002-2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+/*
+ * Removing a translation from a page table (including TLB-shootdown) is a four-step
+ * procedure:
+ *
+ *	(1) Flush (virtual) caches --- ensures virtual memory is coherent with kernel memory
+ *	    (this is a no-op on ia64).
+ *	(2) Clear the relevant portions of the page-table
+ *	(3) Flush the TLBs --- ensures that stale content is gone from CPU TLBs
+ *	(4) Release the pages that were freed up in step (2).
+ *
+ * Note that the ordering of these steps is crucial to avoid races on MP machines.
+ *
+ * The Linux kernel defines several platform-specific hooks for TLB-shootdown.  When
+ * unmapping a portion of the virtual address space, these hooks are called according to
+ * the following template:
+ *
+ *	tlb <- tlb_gather_mmu(mm);			// start unmap for address space MM
+ *	{
+ *	  for each vma that needs a shootdown do {
+ *	    tlb_start_vma(tlb, vma);
+ *	      for each page-table-entry PTE that needs to be removed do {
+ *		tlb_remove_tlb_entry(tlb, pte, address);
+ *		if (pte refers to a normal page) {
+ *		  tlb_remove_page(tlb, page);
+ *		}
+ *	      }
+ *	    tlb_end_vma(tlb, vma);
+ *	  }
+ *	}
+ *	tlb_finish_mmu(tlb);				// finish unmap for address space MM
+ */
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+
+#include <asm/processor.h>
+#include <asm/tlbflush.h>
+
+#include <asm-generic/tlb.h>
+
+#endif /* _ASM_IA64_TLB_H */