This patch set is to allow kdump 2nd kernel to wake up multiple CPUs
even if 1st kernel crashs on some AP.
Sorry, this patch set have not include in-source documentation
requested by Borislav Petkov yet, but I'll post it later separately,
which would be better to focus on documentation reviewing.
ChangeLog
v2 => v3)
- Change default value of boot_cpu_is_bsp to true.
- Before executing rdmsr(MSR_IA32_APICBASE), check if the number of
processor family is larger than or equal to 6 in order to avoid
invalid opcode exception on processors where MSR_IA32_APICBASE is
not supported.
v1 => v2)
- Rebased on top of v3.12-rc5.
- Fix linking time error of boot_cpu_is_bsp_init() in case of
CONFIG_LOCAL_APIC disabled by adding empty static inline function
instead.
- Fix missing feature check by means of cpu_has_apic macro in
boot_cpu_is_bsp_init() before calling rdmsr_safe(MSR_IA32_APICBASE).
NOTE: I've checked local apic-present case only; I don't have any
x86 processor without local apic.
- Add __init annotation to boot_cpu_is_bsp_init().
Test
- built with and without CONFIG_LOCAL_APIC
- tested x86_64 in case of acpi and MP table
---
HATAYAMA Daisuke (2):
x86, apic: Add boot_cpu_is_bsp() to check if boot cpu is BSP
x86, apic: Disable BSP if boot cpu is AP
arch/x86/include/asm/mpspec.h | 9 ++++++++-
arch/x86/kernel/acpi/boot.c | 6 +++++-
arch/x86/kernel/apic/apic.c | 35 ++++++++++++++++++++++++++++++++++-
arch/x86/kernel/devicetree.c | 1 +
arch/x86/kernel/mpparse.c | 15 +++++++++++++--
arch/x86/kernel/setup.c | 2 ++
arch/x86/platform/sfi/sfi.c | 2 +-
7 files changed, 64 insertions(+), 6 deletions(-)
--
Thanks.
HATAYAMA, Daisuke
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