diff options
| author | Cyrill Gorcunov <gorcunov@gmail.com> | 2009-05-11 15:41:40 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-05-11 15:50:58 +0200 |
| commit | cec6be6d1069d697beb490bbb40a290d5ff554a2 (patch) | |
| tree | 43ef99d950545909d8dbc87cddb14e29789aa060 | |
| parent | x86: display extended apic registers with print_local_APIC and cpu_debug code (diff) | |
| download | linux-cec6be6d1069d697beb490bbb40a290d5ff554a2.tar.xz linux-cec6be6d1069d697beb490bbb40a290d5ff554a2.zip | |
x86: apic: Fixmap apic address even if apic disabled
In case if apic were disabled by boot option
we still need read_apic operation. So fixmap
a fake apic area if needed.
[ Impact: fix boot crash ]
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: yinghai@kernel.org
Cc: eswierk@aristanetworks.com
LKML-Reference: <20090511134140.GH4624@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 0e6543fafb50..07cffc1214cb 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1587,13 +1587,6 @@ void __init init_apic_mappings(void) } else apic_phys = mp_lapic_addr; - /* lets check if we may NOP'ify apic operations */ - if (!cpu_has_apic) { - pr_info("APIC: disable apic facility\n"); - apic_disable(); - return; - } - /* * acpi lapic path already maps that address in * acpi_register_lapic_address() @@ -1602,7 +1595,15 @@ void __init init_apic_mappings(void) set_fixmap_nocache(FIX_APIC_BASE, apic_phys); apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n", - APIC_BASE, apic_phys); + APIC_BASE, apic_phys); + + /* lets check if we may NOP'ify apic operations */ + if (!cpu_has_apic) { + pr_info("APIC: disable apic facility\n"); + apic_disable(); + return; + } + /* * Fetch the APIC ID of the BSP in case we have a * default configuration (or the MP table is broken). |