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

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Message-ID: <a43fe392-bd6a-71f5-8611-c6b764ba56c3@arm.com>
Date:   Wed, 4 Sep 2019 13:07:18 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     mingo@...hat.com, peterz@...radead.org,
        linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        linux-block@...r.kernel.org, dm-devel@...hat.com, axboe@...nel.dk,
        aarcange@...hat.com
Subject: Re: [PATCH] sched: make struct task_struct::state 32-bit

On 03/09/2019 22:51, Valentin Schneider wrote:
[...]
> I tried something for function parameters, which seems to be feasible
> according to [1], but couldn't get it to work (yet). Here's what I have
> so far:
> 
[...]

So now I have this:

---
@funcmatch@
identifier func;
identifier p;
identifier state_var;
@@

  func(..., struct task_struct *p, ...
-      , long state_var
+      , int state_var
       ,...)
{
	...
}
---

Which seems to be doing roughly what I want. I probably need another
version to cover functions with reverse parameter order, and also need
to make it match functions that assign state_var to p->state (or pass it
down to another function that might do it).

Baby steps...