linux-kernel - [34-longterm 121/209] x86, mm: Fix CONFIG_VMSPLIT_1G and 2G

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Message-Id: <1302803767-9715-8-git-send-email-paul.gortmaker@windriver.com>
Date:	Thu, 14 Apr 2011 13:54:39 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Hugh Dickins <hughd@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 121/209] x86, mm: Fix CONFIG_VMSPLIT_1G and 2G_OPT trampoline

From: Hugh Dickins <hughd@...gle.com>

  =====================================================================
  | This is a commit scheduled for the next v2.6.34 longterm release. |
  | If you see a problem with using this for longterm, please comment.|
  =====================================================================

commit b7d460897739e02f186425b7276e3fdb1595cea7 upstream.

rc2 kernel crashes when booting second cpu on this CONFIG_VMSPLIT_2G_OPT
laptop: whereas cloning from kernel to low mappings pgd range does need
to limit by both KERNEL_PGD_PTRS and KERNEL_PGD_BOUNDARY, cloning kernel
pgd range itself must not be limited by the smaller KERNEL_PGD_BOUNDARY.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
LKML-Reference: <alpine.LSU.2.00.1008242235120.2515@...ter.anvils>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 arch/x86/kernel/trampoline.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/trampoline.c b/arch/x86/kernel/trampoline.c
index a874495..e2a5952 100644
--- a/arch/x86/kernel/trampoline.c
+++ b/arch/x86/kernel/trampoline.c
@@ -45,8 +45,7 @@ void __init setup_trampoline_page_table(void)
 	/* Copy kernel address range */
 	clone_pgd_range(trampoline_pg_dir + KERNEL_PGD_BOUNDARY,
 			swapper_pg_dir + KERNEL_PGD_BOUNDARY,
-			min_t(unsigned long, KERNEL_PGD_PTRS,
-			      KERNEL_PGD_BOUNDARY));
+			KERNEL_PGD_PTRS);
 
 	/* Initialize low mappings */
 	clone_pgd_range(trampoline_pg_dir,
-- 
1.7.4.4

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