linux-kernel - Re: [RFC PATCH] resource: Fix CXL node not populated issue

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Message-ID: <Z08KiPwwiw72Vo9R@smile.fi.intel.com>
Date: Tue, 3 Dec 2024 15:41:28 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: "Huang, Ying" <ying.huang@...ux.alibaba.com>
Cc: Raghavendra K T <raghavendra.kt@....com>, linux-kernel@...r.kernel.org,
	linux-cxl@...r.kernel.org, bharata@....com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Williams <dan.j.williams@...el.com>,
	David Hildenbrand <david@...hat.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Alistair Popple <apopple@...dia.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Baoquan He <bhe@...hat.com>,
	ilpo.jarvinen@...ux.intel.com,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Fontenot Nathan <Nathan.Fontenot@....com>,
	Wei Huang <wei.huang2@....com>
Subject: Re: [RFC PATCH] resource: Fix CXL node not populated issue

On Tue, Dec 03, 2024 at 02:26:52PM +0800, Huang, Ying wrote:
> Raghavendra K T <raghavendra.kt@....com> writes:

...

> > git bisect had led to below commit
> > Fixes: b4afe4183ec7 ("resource: fix region_intersects() vs add_memory_driver_managed()")
> 
> This breaks you case, sorry about that.  But this also fixed a real bug
> too.  So, it's not appropriate just to revert it blindly.

Linus was clear about this recently. Even if it fixes a bug, regression is
still regression and might (*) lead to a revert.
https://lwn.net/Articles/990599/

(*) in general fixes are better than reverts, but depends on the timing in
    the release cycle the revert may be the only option.

-- 
With Best Regards,
Andy Shevchenko