linux-kernel - Re: [RFC v3 1/5] cleanup: Fix discarded const warning when defining lock guard

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Date: Mon, 25 Mar 2024 17:50:55 -0700
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: Christian Brauner <brauner@...nel.org>
Cc: amir73il@...il.com, hu1.chen@...el.com, miklos@...redi.hu,
 malini.bhandaru@...el.com, tim.c.chen@...el.com, mikko.ylinen@...el.com,
 lizhen.you@...el.com, linux-unionfs@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v3 1/5] cleanup: Fix discarded const warning when defining
 lock guard

Christian Brauner <brauner@...nel.org> writes:

>
> So something like this? (Amir?)
>
>  
> -DEFINE_LOCK_GUARD_1(cred, const struct cred, _T->lock = override_creds_light(_T->lock),
> -	     revert_creds_light(_T->lock));
> +DEFINE_LOCK_GUARD_1(cred, struct cred,
> +		    _T->lock = (struct cred *)override_creds_light(_T->lock),
> +		    revert_creds_light(_T->lock));
> +
> +#define cred_guard(_cred) guard(cred)(((struct cred *)_cred))
> +#define cred_scoped_guard(_cred) scoped_guard(cred, ((struct cred *)_cred))
>  
>  /**
>   * get_new_cred_many - Get references on a new set of credentials

Thinking about proposing a PATCH version (with these suggestions applied), Amir
has suggested in the past that I should propose two separate series:
 (1) introducing the guard helpers + backing file changes;
 (2) overlayfs changes;

Any new ideas about this? Or should I go with this plan?


Cheers,
-- 
Vinicius