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7122beeee7
linux/arch/powerpc
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Vaidyanathan Srinivasan 7122beeee7 powerpc: fix numa distance for form0 device tree 
The following commit breaks numa distance setup for old powerpc
systems that use form0 encoding in device tree.

commit 41eab6f88f
powerpc/numa: Use form 1 affinity to setup node distance

Device tree node /rtas/ibm,associativity-reference-points would
index into /cpus/PowerPCxxxx/ibm,associativity based on form0 or
form1 encoding detected by ibm,architecture-vec-5 property.

All modern systems use form1 and current kernel code is correct.
However, on older systems with form0 encoding, the numa distance
will get hard coded as LOCAL_DISTANCE for all nodes.  This causes
task scheduling anomaly since scheduler will skip building numa
level domain (topmost domain with all cpus) if all numa distances
are same.  (value of 'level' in sched_init_numa() will remain 0)

Prior to the above commit:
((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)

Restoring compatible behavior with this patch for old powerpc systems
with device tree where numa distance are encoded as form0.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
2013-04-18 15:59:56 +10:00
..
boot Merge remote-tracking branch 'agust/next' into next 2013-02-20 11:39:05 +11:00
configs powerpc/ps3: Update ps3_defconfig 2013-04-18 13:03:50 +10:00
crypto powerpc: Fix compile of sha1-powerpc-asm.S on 32-bit 2013-03-05 16:56:26 +11:00
include powerpc/ptrace: Add DAWR debug feature info for userspace 2013-04-18 15:59:55 +10:00
kernel powerpc/ptrace: Add DAWR debug feature info for userspace 2013-04-18 15:59:55 +10:00
kvm powerpc: Fix build errors with UP configs in HV-style KVM 2013-04-18 13:03:57 +10:00
lib uprobes/powerpc: Add dependency on single step emulation 2013-01-29 11:35:06 +11:00
math-emu
mm powerpc: fix numa distance for form0 device tree 2013-04-18 15:59:56 +10:00
net PPC: net: bpf_jit_comp: add VLAN instructions for BPF JIT 2012-11-17 22:12:47 -05:00
oprofile Merge branch 'merge' into next 2013-01-29 11:33:37 +11:00
perf perf/urgent fixes: 2013-03-18 10:00:56 +01:00
platforms powerpc/pseries: close DDW race between functions of adapter 2013-04-18 13:04:00 +10:00
sysdev powerpc: Use PTR_RET instead of IS_ERR/PTR_ERR 2013-04-18 13:03:48 +10:00
xmon powerpc: Rename set_break to avoid naming conflict 2013-01-16 05:25:47 +11:00
Kconfig memblock: kill "config MAX_ACTIVE_REGIONS" 2013-04-18 13:03:53 +10:00
Kconfig.debug powerpc: IOMMU fault injection 2012-07-10 19:18:59 +10:00
Makefile powerpc: Avoid load of static chain register when calling nested functions through a pointer on 64bit 2013-01-10 17:01:27 +11:00
relocs_check.pl powerpc: Process dynamic relocations for kernel 2011-12-20 10:21:08 -05:00