linux-kernel - [tip:x86/urgent] x86, mm: Fix CONFIG_VMSPLIT_1G and 2G

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Message-ID: <tip-b7d460897739e02f186425b7276e3fdb1595cea7@git.kernel.org>
Date:	Wed, 25 Aug 2010 07:13:06 GMT
From:	tip-bot for Hugh Dickins <hughd@...gle.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	hughd@...gle.com, tglx@...utronix.de
Subject: [tip:x86/urgent] x86, mm: Fix CONFIG_VMSPLIT_1G and 2G_OPT trampoline

Commit-ID:  b7d460897739e02f186425b7276e3fdb1595cea7
Gitweb:     http://git.kernel.org/tip/b7d460897739e02f186425b7276e3fdb1595cea7
Author:     Hugh Dickins <hughd@...gle.com>
AuthorDate: Tue, 24 Aug 2010 22:44:12 -0700
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Tue, 24 Aug 2010 23:05:17 -0700

x86, mm: Fix CONFIG_VMSPLIT_1G and 2G_OPT trampoline

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>
---
 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,
--
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