linux-kernel - Re: [PATCH] block/laptop_mode: Convert timers to use timer

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Date:   Thu, 5 Oct 2017 13:49:38 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Johannes Weiner <hannes@...xchg.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Jeff Layton <jlayton@...hat.com>, linux-block@...r.kernel.org,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH] block/laptop_mode: Convert timers to use timer_setup()

On 10/05/2017 01:41 PM, Jens Axboe wrote:
> On 10/05/2017 01:23 PM, Thomas Gleixner wrote:
>> On Thu, 5 Oct 2017, Jens Axboe wrote:
>>> On 10/05/2017 11:49 AM, Kees Cook wrote:
>>>> Yes, totally true. tglx and I ended up meeting face-to-face at the
>>>> Kernel Recipes conference and we solved some outstanding design issues
>>>> with the conversion. The timing meant the new API went into -rc3,
>>>> which seemed better than missing an entire release cycle, or carrying
>>>> deltas against maintainer trees that would drift. (This is actually my
>>>> second massive refactoring of these changes...)
>>>
>>> Honestly, I think the change should have waited for 4.15 in that case.
>>> Why the rush? It wasn't ready for the merge window.
>>
>> Come on. You know very well that a prerequisite for global changes which is
>> not yet used in Linus tree can get merged post merge windew in order to
>> avoid massive inter maintainer tree dependencies. We've done that before.
> 
> My point is that doing it this late makes things harder than they should
> have been. If this was in for -rc1, it would have made things a lot
> easier. Or even -rc2. I try and wait to fork off the block tree for as
> long as I can, -rc2 is generally where that happens.

Timing of the change aside, this patch doesn't even apply to the 4.15
block tree:

checking file block/blk-core.c
checking file include/linux/writeback.h
Hunk #1 succeeded at 309 (offset -20 lines).
checking file mm/page-writeback.c
Hunk #1 FAILED at 1977.
Hunk #2 FAILED at 1988.
2 out of 2 hunks FAILED

-- 
Jens Axboe