Re: ARCH=arm LLVM_IAS=1 patches for 5.10, 5.4, and 4.19

From: Sasha Levin <sashal@kernel.org>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: "Nick Desaulniers" <ndesaulniers@google.com>,
	"Ard Biesheuvel" <ardb@kernel.org>,
	"# 3.4.x" <stable@vger.kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	"Jian Cai" <jiancai@google.com>, "Stefan Agner" <stefan@agner.ch>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Sami Tolvanen" <samitolvanen@google.com>,
	candle.sun@unisoc.com,
	"Miles Chen (陳民樺)" <miles.chen@mediatek.com>,
	"Stephen Hines" <srhines@google.com>,
	"Luis Lozano" <llozano@google.com>,
	"Sandeep Patil" <sspatil@google.com>,
	"Marc Zyngier" <maz@kernel.org>
Subject: Re: ARCH=arm LLVM_IAS=1 patches for 5.10, 5.4, and 4.19
Date: Mon, 15 Mar 2021 16:43:13 -0400	[thread overview]
Message-ID: <YE/G4ZGtFNDFw9ej@sashalap> (raw)
In-Reply-To: <YE+wNS1iiVTU8YGb@kroah.com>

On Mon, Mar 15, 2021 at 08:06:29PM +0100, Greg KH wrote:
>On Mon, Mar 15, 2021 at 10:43:26AM -0700, Nick Desaulniers wrote:
>> Then it should be possible for any patch
>> that itself is backported (contains "commit XXX upstream") to be fed
>> in when auto selected or submitted to stable (or before then) to check
>> for new fixes.  Probably would still need to be run periodically, as
>> Fixes: aren't necessarily available when AutoSel runs.  For the
>> toolchain, we have a bot that watches for reverts for example, but
>> non-standard commit messages denoting one patch fixes another makes
>> this far from perfect.  Would still need to be run periodically,
>> because if a Fixes: exists, but hasn't been merged yet, it could get
>> missed.
>
>I do re-run my script at times, it does require it to be run every once
>in a while.  But again, who is going to care about this except me and
>Sasha?

I actually run something like that often, there are tons of patches with
Fixes: that points to commits in the stable tree, but quite a few need a
less-than-trivial backport that no one did.

>> Though I'm curious how the machinery that picks up Fixes: tags works.
>> Does it run on a time based cadence?  Is it only run as part of
>> AutoSel, but not for manual backports sent to the list?  Would it have
>> picked up on f77ac2e378be at some point?
>
>Maybe it will, mine might have picked it up, who knows, I haven't run it
>in a while.  But as you say, because it fails to apply, that's a good
>reason for me to not backport it.

I run it on a weekly basis for *new* commits.

-- 
Thanks,
Sasha