linux-kernel - Re: [PATCH] ACPICA: Tables: Skip NULL entries in RSDT and XSDT.

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Date:	Thu, 17 Apr 2014 20:39:45 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"Zheng, Lv" <lv.zheng@...el.com>
Cc:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Brown, Len" <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Zhao, Yakui" <yakui.zhao@...el.com>
Subject: Re: [PATCH] ACPICA: Tables: Skip NULL entries in RSDT and XSDT.

On Fri, Apr 18, 2014 at 03:00:21AM +0000, Zheng, Lv wrote:
> Hi, Greg
> 
> > From: Greg KH [mailto:gregkh@...uxfoundation.org]
> > Sent: Friday, April 18, 2014 10:44 AM
> > 
> > On Fri, Apr 18, 2014 at 09:53:19AM +0800, Lv Zheng wrote:
> > > Note that this patch is only used for stable kernels, upstream kernels
> > > will have this problem fixed in ACPICA 201303-04 release.  So upstream
> > > kernels shouldn't merge this commit.
> > 
> > What kernel commit fixed this issue in "upstream"?
> 
> There is no kernel commit now has fixed this issue in "upstream".
> The fix commit need to go into ACPICA first, so I believe it will
> appear in 3.15-rc2 (ACPICA 201403xx release) or 3.15-rc3 (ACPICA
> 201404xx release).

Then I can't take this patch at all in any stable tree.  Please read
Documentation/stable_kernel_rules.txt for why and how to properly do
this.

Just mark the commit that fixes the issue in Linus's tree for stable,
and it will happen automatically.

> The back port of the fix commit will have many dependencies as we have
> a big change in ACPICA table manager in ACPICA 201403xx release.

Why not just submit this fix first to Linus, for his tree now, and then
do the larger changes later?

> However this back port is very light and has been confirmed by the reporters.
> 
> The bug seems to be urgent, it has broken many platforms shipped with
> AMI BIOSes versioning from F2 to F4.  Someone may monitor here to find
> a valid fix.

Not any stable maintainers, we can't take patches that aren't in Linus's
tree, sorry.

greg k-h
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