linux-kernel - [PATCH 11/12] x86/mm: Remove pgd

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Date:	Thu, 11 Jun 2015 16:07:16 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mml@...r.kernel.org, Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Waiman Long <Waiman.Long@...com>
Subject: [PATCH 11/12] x86/mm: Remove pgd_list leftovers

Nothing uses the pgd_list anymore - remove the list itself and its helpers.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Waiman Long <Waiman.Long@...com>
Cc: linux-mm@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/pgtable.h |  3 ---
 arch/x86/mm/fault.c            |  1 -
 arch/x86/mm/pgtable.c          | 26 --------------------------
 3 files changed, 30 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index fe57e7a98839..7e93438d8b53 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -29,9 +29,6 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 
 extern spinlock_t pgd_lock;
-extern struct list_head pgd_list;
-
-extern struct mm_struct *pgd_page_get_mm(struct page *page);
 
 #ifdef CONFIG_PARAVIRT
 #include <asm/paravirt.h>
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 2d587e548b59..bebdd97f888b 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -186,7 +186,6 @@ force_sig_info_fault(int si_signo, int si_code, unsigned long address,
 }
 
 DEFINE_SPINLOCK(pgd_lock);
-LIST_HEAD(pgd_list);
 
 #ifdef CONFIG_X86_32
 static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index d855010a111f..0666f7796806 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -84,35 +84,9 @@ void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
 #endif	/* CONFIG_PGTABLE_LEVELS > 3 */
 #endif	/* CONFIG_PGTABLE_LEVELS > 2 */
 
-static inline void pgd_list_add(pgd_t *pgd)
-{
-	struct page *page = virt_to_page(pgd);
-
-	list_add(&page->lru, &pgd_list);
-}
-
-static inline void pgd_list_del(pgd_t *pgd)
-{
-	struct page *page = virt_to_page(pgd);
-
-	list_del(&page->lru);
-}
-
 #define UNSHARED_PTRS_PER_PGD				\
 	(SHARED_KERNEL_PMD ? KERNEL_PGD_BOUNDARY : PTRS_PER_PGD)
 
-
-static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm)
-{
-	BUILD_BUG_ON(sizeof(virt_to_page(pgd)->index) < sizeof(mm));
-	virt_to_page(pgd)->index = (pgoff_t)mm;
-}
-
-struct mm_struct *pgd_page_get_mm(struct page *page)
-{
-	return (struct mm_struct *)page->index;
-}
-
 static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)
 {
 	/* If the pgd points to a shared pagetable level (either the
-- 
2.1.4

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