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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>
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1 changed files with 1 additions and 2 deletions
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@ -45,8 +45,7 @@ void __init setup_trampoline_page_table(void)
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/* Copy kernel address range */
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clone_pgd_range(trampoline_pg_dir + KERNEL_PGD_BOUNDARY,
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swapper_pg_dir + KERNEL_PGD_BOUNDARY,
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min_t(unsigned long, KERNEL_PGD_PTRS,
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KERNEL_PGD_BOUNDARY));
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KERNEL_PGD_PTRS);
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/* Initialize low mappings */
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clone_pgd_range(trampoline_pg_dir,
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