[tip:x86/urgent] x86, mm: Fix CONFIG_VMSPLIT_1G and 2G_OPT trampoline
From: tip-bot for Hugh Dickins
Date: Wed Aug 25 2010 - 03:14:49 EST
Commit-ID: b7d460897739e02f186425b7276e3fdb1595cea7
Gitweb: http://git.kernel.org/tip/b7d460897739e02f186425b7276e3fdb1595cea7
Author: Hugh Dickins <hughd@xxxxxxxxxx>
AuthorDate: Tue, 24 Aug 2010 22:44:12 -0700
Committer: H. Peter Anvin <hpa@xxxxxxxxx>
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@xxxxxxxxxx>
LKML-Reference: <alpine.LSU.2.00.1008242235120.2515@xxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
---
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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