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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@google.com>
LKML-Reference: <alpine.LSU.2.00.1008242235120.2515@sister.anvils>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Hugh Dickins 2010-08-24 22:44:12 -07:00 committed by H. Peter Anvin
parent 51e3c1b558
commit b7d4608977
1 changed files with 1 additions and 2 deletions
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3
arch/x86/kernel/trampoline.c
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@ -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,