linux-kernel - [PATCH] x86/mm: drop unused argument sync_global

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Date:   Mon, 12 Dec 2016 16:57:31 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:     Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH] x86/mm: drop unused argument sync_global_pgds()

There's no users that wants sync_global_pgd(.remove=1) sinc af2cf278ef4f
("x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()").

Let's drop 'remove'.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/include/asm/pgtable_64.h |  3 +--
 arch/x86/mm/fault.c               |  2 +-
 arch/x86/mm/init_64.c             | 25 ++++++-------------------
 3 files changed, 8 insertions(+), 22 deletions(-)

diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 1cc82ece9ac1..62b775926045 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -116,8 +116,7 @@ static inline void native_pgd_clear(pgd_t *pgd)
 	native_set_pgd(pgd, native_make_pgd(0));
 }
 
-extern void sync_global_pgds(unsigned long start, unsigned long end,
-			     int removed);
+extern void sync_global_pgds(unsigned long start, unsigned long end);
 
 /*
  * Conversion functions: convert a page and protection to a page entry,
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index dc8023060456..7e316a0e7fc9 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -413,7 +413,7 @@ out:
 
 void vmalloc_sync_all(void)
 {
-	sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END, 0);
+	sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END);
 }
 
 /*
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 14b9dd71d9e8..164a478fd349 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -89,10 +89,10 @@ static int __init nonx32_setup(char *str)
 __setup("noexec32=", nonx32_setup);
 
 /*
- * When memory was added/removed make sure all the processes MM have
+ * When memory was added make sure all the processes MM have
  * suitable PGD entries in the local PGD level page.
  */
-void sync_global_pgds(unsigned long start, unsigned long end, int removed)
+void sync_global_pgds(unsigned long start, unsigned long end)
 {
 	unsigned long address;
 
@@ -100,14 +100,6 @@ void sync_global_pgds(unsigned long start, unsigned long end, int removed)
 		const pgd_t *pgd_ref = pgd_offset_k(address);
 		struct page *page;
 
-		/*
-		 * When it is called after memory hot remove, pgd_none()
-		 * returns true. In this case (removed == 1), we must clear
-		 * the PGD entries in the local PGD level page.
-		 */
-		if (pgd_none(*pgd_ref) && !removed)
-			continue;
-
 		spin_lock(&pgd_lock);
 		list_for_each_entry(page, &pgd_list, lru) {
 			pgd_t *pgd;
@@ -122,13 +114,8 @@ void sync_global_pgds(unsigned long start, unsigned long end, int removed)
 				BUG_ON(pgd_page_vaddr(*pgd)
 				       != pgd_page_vaddr(*pgd_ref));
 
-			if (removed) {
-				if (pgd_none(*pgd_ref) && !pgd_none(*pgd))
-					pgd_clear(pgd);
-			} else {
-				if (pgd_none(*pgd))
-					set_pgd(pgd, *pgd_ref);
-			}
+                        if (pgd_none(*pgd))
+                            set_pgd(pgd, *pgd_ref);
 
 			spin_unlock(pgt_lock);
 		}
@@ -596,7 +583,7 @@ kernel_physical_mapping_init(unsigned long paddr_start,
 	}
 
 	if (pgd_changed)
-		sync_global_pgds(vaddr_start, vaddr_end - 1, 0);
+		sync_global_pgds(vaddr_start, vaddr_end - 1);
 
 	__flush_tlb_all();
 
@@ -1239,7 +1226,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
 	} else
 		err = vmemmap_populate_basepages(start, end, node);
 	if (!err)
-		sync_global_pgds(start, end - 1, 0);
+		sync_global_pgds(start, end - 1);
 	return err;
 }
 
-- 
2.10.2