linux-kernel - [PATCH v2 0/4] Fixing SMP config for DeviceTree platforms

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Date: Tue,  2 Apr 2024 07:40:26 -0700
From: Saurabh Sengar <ssengar@...ux.microsoft.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	peterz@...radead.org,
	sboyd@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org
Cc: ssengar@...rosoft.com
Subject: [PATCH v2 0/4] Fixing SMP config for DeviceTree platforms

Original motivation for these changes was to fix an SMT warning observed
in Hyper-V VTL platform. Check V1 for more details:
https://lore.kernel.org/lkml/1710265404-23146-1-git-send-email-ssengar@linux.microsoft.com/

But on further review it was observed that x86 DeviceTree config has
modified recently, and there is opportunity to improve the existing
smp parsing for DeviceTree.

https://lore.kernel.org/lkml/20230807135027.064321764@linutronix.de/

Changes are small but I have logically separated them into four patches.
I am willing to merge them if there are too many 

[V2]
- Modified the approch how to fix the SMT issue, this is patch 3
  in this series. V1 for it is mentioned in above link.
- Added 2 more patches which are related to new SMP config parsing.
  These are patches 2 and 4 in this series.
- Fixed an issue with hv_vtl platform how it should use the smp
  parsing for DeviceTree with a fixes tag.

Saurabh Sengar (4):
  x86/hyperv/vtl: Correct parse_smp_cfg assignment
  x86/of: Set the parse_smp_cfg for all the DeviceTree platforms by
    default
  x86/of: Map NUMA node to CPUs as per DeviceTree
  x86/of: Change x86_dtb_parse_smp_config to static

 arch/x86/hyperv/hv_vtl.c          |  1 -
 arch/x86/include/asm/prom.h       |  9 ++-------
 arch/x86/kernel/devicetree.c      | 24 ++++++++++++++----------
 arch/x86/platform/ce4100/ce4100.c |  1 -
 4 files changed, 16 insertions(+), 19 deletions(-)

-- 
2.34.1