The patch titled
i386 kdump boot cpu physical apicid fix
has been removed from the -mm tree. Its filename is
i386-kdump-boot-cpu-physical-apicid-fix.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
------------------------------------------------------
Subject: i386 kdump boot cpu physical apicid fix
From: Vivek Goyal <vgoyal@xxxxxxxxxx>
o Kdump second kernel boot fails after a system crash if second kernel
is UP and acpi=off and if crash occurred on a non-boot cpu.
o Issue here is that MP tables report boot cpu lapic id as 0 but second
kernel is booting on a different processor and MP table data is stale
in this context. Hence apic_id_registered() check fails in setup_local_APIC()
when called from APIC_init_uniprocessor().
o Problem is not seen if ACPI is enabled as in that case
boot_cpu_physical_apicid is read from the LAPIC.
o Problem is not seen with SMP kernels as well because in this case also
boot_cpu_physical_apicid is read from LAPIC. (smp_boot_cpus()).
o The problem is fixed by reading boot_cpu_physical_apicid from LAPIC
if it is a UP kernel and CRASH_DUMP is enabled.
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/apic.c | 8 ++++++++
1 files changed, 8 insertions(+)
diff -puN arch/i386/kernel/apic.c~i386-kdump-boot-cpu-physical-apicid-fix arch/i386/kernel/apic.c
--- devel/arch/i386/kernel/apic.c~i386-kdump-boot-cpu-physical-apicid-fix 2006-05-20 14:59:38.000000000 -0700
+++ devel-akpm/arch/i386/kernel/apic.c 2006-05-20 14:59:38.000000000 -0700
@@ -1341,6 +1341,14 @@ int __init APIC_init_uniprocessor (void)
connect_bsp_APIC();
+ /*
+ * Hack: In case of kdump, after a crash, kernel might be booting
+ * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid
+ * might be zero if read from MP tables. Get it from LAPIC.
+ */
+#ifdef CONFIG_CRASH_DUMP
+ boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
+#endif
phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
setup_local_APIC();
_
Patches currently in -mm which might be from vgoyal@xxxxxxxxxx are
origin.patch
i386-export-memory-more-than-4g-through-proc-iomem.patch
kconfigurable-resources-core-changes.patch
kconfigurable-resources-core-changes-i386-fix.patch
kconfigurable-resources-core-changes-fix.patch
kconfigurable-resources-driver-pci-changes.patch
kconfigurable-resources-driver-others-changes.patch
kconfigurable-resources-arch-dependent-changes-arch-a-i.patch
kconfigurable-resources-arch-dependent-changes-arch-a-i-fix.patch
kconfigurable-resources-arch-dependent-changes-arch-j-p.patch
kconfigurable-resources-arch-dependent-changes-arch-q-z.patch
typesh-sector_t-and-blkcnt_t-arent-for-userspace.patch
kconfigurable-resources-mtd-fixes.patch
mpt-fusion-driver-initialization-failure-fix.patch
register-hot-added-memory-to-iomem-resource.patch
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