linux-kernel - Re: [PATCH] sched: make struct task

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Message-ID: <d46b479b-247b-a291-75f9-b60dd7114440@arm.com>
Date:   Wed, 4 Sep 2019 11:25:14 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     David Laight <David.Laight@...LAB.COM>,
        'Alexey Dobriyan' <adobriyan@...il.com>
Cc:     "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "aarcange@...hat.com" <aarcange@...hat.com>
Subject: Re: [PATCH] sched: make struct task_struct::state 32-bit

On 04/09/2019 10:43, David Laight wrote:
> From: Alexey Dobriyan
>> Sent: 03 September 2019 19:19
> ...
>>> How did you come up with this changeset, did you pickaxe for some regexp?
>>
>> No, manually, backtracking up to the call chain.
>> Maybe I missed a few places.
> 
> Renaming the structure field and getting the compiler to find all the uses can help.
> 
> 	David
> 

It's a good idea but sadly doesn't cover whatever the config doesn't
compile. A safer starting point could be

---
@state_var@
struct task_struct *p;
identifier var;
@@
(
var = p->state
|
p->state = var
)

@@
identifier state_var.var;
@@
- var
+ FIXME
---

But I'm hoping we can get something even better from coccinelle, stay
tuned...

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