linux-kernel - [tip:x86/urgent] x86-64: Fix page table accounting

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Date:	Wed, 24 Oct 2012 03:10:32 -0700
From:	tip-bot for Jan Beulich <JBeulich@...e.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	jbeulich@...e.com, hughd@...gle.com, JBeulich@...e.com,
	stable@...nel.org, tglx@...utronix.de
Subject: [tip:x86/urgent] x86-64: Fix page table accounting

Commit-ID:  876ee61aadf01aa0db981b5d249cbdd53dc28b5e
Gitweb:     http://git.kernel.org/tip/876ee61aadf01aa0db981b5d249cbdd53dc28b5e
Author:     Jan Beulich <JBeulich@...e.com>
AuthorDate: Thu, 4 Oct 2012 14:48:10 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Oct 2012 10:50:25 +0200

x86-64: Fix page table accounting

Commit 20167d3421a089a1bf1bd680b150dc69c9506810 ("x86-64: Fix
accounting in kernel_physical_mapping_init()") went a little too
far by entirely removing the counting of pre-populated page
tables: this should be done at boot time (to cover the page
tables set up in early boot code), but shouldn't be done during
memory hot add.

Hence, re-add the removed increments of "pages", but make them
and the one in phys_pte_init() conditional upon !after_bootmem.

Reported-Acked-and-Tested-by: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Jan Beulich <jbeulich@...e.com>
Cc: <stable@...nel.org>
Link: http://lkml.kernel.org/r/506DAFBA020000780009FA8C@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/mm/init_64.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 2b6b4a3..3baff25 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -386,7 +386,8 @@ phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
 		 * these mappings are more intelligent.
 		 */
 		if (pte_val(*pte)) {
-			pages++;
+			if (!after_bootmem)
+				pages++;
 			continue;
 		}
 
@@ -451,6 +452,8 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
 			 * attributes.
 			 */
 			if (page_size_mask & (1 << PG_LEVEL_2M)) {
+				if (!after_bootmem)
+					pages++;
 				last_map_addr = next;
 				continue;
 			}
@@ -526,6 +529,8 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
 			 * attributes.
 			 */
 			if (page_size_mask & (1 << PG_LEVEL_1G)) {
+				if (!after_bootmem)
+					pages++;
 				last_map_addr = next;
 				continue;
 			}
--
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