linux-kernel - Re: linus-next: improving functional testing for to-be-merged pull requests

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Message-ID: <0cf2898d-da29-470d-9b26-ff5f85ccd437@leemhuis.info>
Date: Wed, 23 Oct 2024 12:18:28 +0200
From: Thorsten Leemhuis <linux@...mhuis.info>
To: Vlastimil Babka <vbabka@...e.cz>, Steven Rostedt <rostedt@...dmis.org>,
 Christoph Hellwig <hch@...radead.org>
Cc: Kees Cook <kees@...nel.org>, Sasha Levin <sashal@...nel.org>,
 torvalds@...ux-foundation.org, ksummit@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: linus-next: improving functional testing for to-be-merged pull
 requests

On 23.10.24 11:32, Vlastimil Babka wrote:
> On 10/23/24 10:20, Steven Rostedt wrote:
>> To put it this way. The bugs I'm fixing was for code in linux-next
>> where the bugs were never found. They only appeared when they went into
>> Linus's tree. So why put the fixes in linux-next, if it didn't catch
>> the bugs I fixed in the first place?
> 
> The fix might be in a different part of the code, one that's stressed by
> -next testing even if the code with the original bug wasn't. So I don't
> think you can always assume that -next not catching the original bug means
> it can't catch a bug in the fix?

+1 to this and the "compile failures on obscure architectures or
configs" from Geert.

A -fixes branch in -next also makes a few things easier for regression
tracking:

* I only have to check *one* place instead of one or two hundred to see
if a regression fix is heading towards mainline or stuck somewhere.

* I can see if people accidentally queued regression fix for the current
or the next cycle when it should be the former (some subsystems make
this hard or impossible).

Ciao, Thorsten