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    Subject[PATCH 2/3] x86, mm: Fix CONFIG_VMSPLIT_1G and 2G_OPT trampoline
    Date
    From: Hugh Dickins <hughd@google.com>

    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@google.com>
    LKML-Reference: <alpine.LSU.2.00.1008242235120.2515@sister.anvils>
    Signed-off-by: H. Peter Anvin <hpa@zytor.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 4e816a4..0ac23a7 100644
    --- a/arch/x86/kernel/trampoline.c
    +++ b/arch/x86/kernel/trampoline.c
    @@ -47,8 +47,7 @@ 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,
    --
    1.7.0.4



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