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Subject: Re: [PATCH 15/16] apparmor: Replace spin_is_locked() with lockdep
To:     Lance Roy <ldr709@gmail.com>, linux-kernel@vger.kernel.org
Cc:     "Paul E. McKenney" <paulmck@linux.ibm.com>,
        James Morris <jmorris@namei.org>,
        "Serge E. Hallyn" <serge@hallyn.com>,
        linux-security-module@vger.kernel.org
References: <20181003053902.6910-1-ldr709@gmail.com>
 <20181003053902.6910-16-ldr709@gmail.com>
From:   John Johansen <john.johansen@canonical.com>
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Organization: Canonical
Message-ID: <8bfc8046-3527-8ead-3a16-16bfe85cd611@canonical.com>
Date:   Tue, 2 Oct 2018 22:56:06 -0700
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On 10/02/2018 10:39 PM, Lance Roy wrote:
> lockdep_assert_held() is better suited to checking locking requirements,
> since it won't get confused when someone else holds the lock. This is
> also a step towards possibly removing spin_is_locked().
> 
> Signed-off-by: Lance Roy <ldr709@gmail.com>
> Cc: John Johansen <john.johansen@canonical.com>
> Cc: James Morris <jmorris@namei.org>
> Cc: "Serge E. Hallyn" <serge@hallyn.com>
> Cc: <linux-security-module@vger.kernel.org>

Acked-by: John Johansen <john.johansen@canonical.com>

> ---
>  security/apparmor/file.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/security/apparmor/file.c b/security/apparmor/file.c
> index 4285943f7260..d0afed9ebd0e 100644
> --- a/security/apparmor/file.c
> +++ b/security/apparmor/file.c
> @@ -496,7 +496,7 @@ static void update_file_ctx(struct aa_file_ctx *fctx, struct aa_label *label,
>  	/* update caching of label on file_ctx */
>  	spin_lock(&fctx->lock);
>  	old = rcu_dereference_protected(fctx->label,
> -					spin_is_locked(&fctx->lock));
> +					lockdep_is_held(&fctx->lock));
>  	l = aa_label_merge(old, label, GFP_ATOMIC);
>  	if (l) {
>  		if (l != old) {
>