From 62ee0540f5e5a804b79cae8b3c0185a85f02436b Mon Sep 17 00:00:00 2001 From: Doug Chapman Date: Wed, 5 Nov 2008 17:57:52 -0500 Subject: [IA64] fix boot panic caused by offline CPUs This fixes a regression introduced by 2c6e6db41f01b6b4eb98809350827c9678996698 "Minimize per_cpu reservations." That patch incorrectly used information about what CPUs are possible that was not yet initialized by ACPI. The end result was that per_cpu structures for offline CPUs were not initialized causing a NULL pointer reference. Since we cannot do the full acpi_boot_init() call any earlier, the simplest fix is to just parse the MADT for SAPIC entries early to find the CPU info. This should also allow for some cleanup of the code added by the "Minimize per_cpu reservations". This patch just fixes the regressions, the cleanup will come in a later patch. Signed-off-by: Doug Chapman Signed-off-by: Alex Chiang CC: Robin Holt Signed-off-by: Tony Luck --- arch/ia64/kernel/setup.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'arch/ia64/kernel/setup.c') diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c index ae7911702bf8..bf441f49682c 100644 --- a/arch/ia64/kernel/setup.c +++ b/arch/ia64/kernel/setup.c @@ -561,8 +561,12 @@ setup_arch (char **cmdline_p) #ifdef CONFIG_ACPI /* Initialize the ACPI boot-time table parser */ acpi_table_init(); + early_acpi_boot_init(); # ifdef CONFIG_ACPI_NUMA acpi_numa_init(); +#ifdef CONFIG_ACPI_HOTPLUG_CPU + prefill_possible_map(); +#endif per_cpu_scan_finalize((cpus_weight(early_cpu_possible_map) == 0 ? 32 : cpus_weight(early_cpu_possible_map)), additional_cpus > 0 ? additional_cpus : 0); @@ -853,9 +857,6 @@ void __init setup_per_cpu_areas (void) { /* start_kernel() requires this... */ -#ifdef CONFIG_ACPI_HOTPLUG_CPU - prefill_possible_map(); -#endif } /* -- cgit v1.2.3