linux-kernel - Re: [PATCH] sparc64: fix hugetlb for sun4u

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Message-ID: <b5b75976c94b7b46f86a5af4675a1a570aaf20cc.camel@physik.fu-berlin.de>
Date: Sun, 10 Aug 2025 11:52:36 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Anthony Yznaga <anthony.yznaga@...cle.com>, sparclinux@...r.kernel.org, 
	davem@...emloft.net, andreas@...sler.com
Cc: linux-kernel@...r.kernel.org, agordeev@...ux.ibm.com, will@...nel.org, 
	ryan.roberts@....com, david@...hat.com, osalvador@...e.de
Subject: Re: [PATCH] sparc64: fix hugetlb for sun4u

Hi Anthony,

On Sat, 2025-08-09 at 08:42 +0200, John Paul Adrian Glaubitz wrote:
> Let me know if you have more suggestions to test. I can also provide you with full
> access to this Netra 240 if you send me your public SSH key in a private mail.

I have narrowed it down to a regression between v6.3 and v6.4 now.

The bug can be reproduced with the sparc64_defconfig on a Sun Netra 240 by setting
CONFIG_TRANSPARENT_HUGEPAGE=y and CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y. When testing
on a modern systemd-based distribution, it's also necessary to enable CGroup support
as well as enable support for Sun partition tables with CONFIG_SUN_PARTITION=y.

Then it should be a matter of bisecting the commits between v6.3 and v6.4.

I will do that within the next days as I'm currently a bit busy with other stuff.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913