linux-kernel - Re: [PATCH 11/11] checkpatch: Check for spin_is

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Date:	Fri, 16 Mar 2012 12:22:35 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH 11/11] checkpatch: Check for spin_is_locked

On Fri, 2012-03-16 at 12:01 -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> spin_is_locked is usually misused. In checkpatch.pl
> - warn when it is used at all
> - error out when it is asserted on free, because that's usually broken
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> +# spin_is_locked is usually misused. warn about it.
> +		if ($line =~ /\bspin_is_locked\s*\(/) {
> +			# BUG_ON/WARN_ON(!spin_is_locked() is generally a bug
> +			if ($line =~ /(BUG_ON|WARN_ON|ASSERT)\s*\(!spin_is_locked/) {
> +				ERROR("ASSERT_SPIN_IS_LOCKED",
> +				     "Use lockdep_assert_held() instead of asserts on !spin_is_locked\n"
> +				      . $herecurr);
> +			} else {
> +				WARN("SPIN_IS_LOCKED",
> +				     "spin_is_locked is very rarely correctly used. Please reconsider\n"
> +					. $herecurr)
> +			}
> +		}
> +

I suggest you use a single --ignore string of
"SPIN_IS_LOCKED" instead of different ones.

Grammar might be improved in the WARN.  Maybe:
"Using spin_is_locked() is generally wrong. See [foo documentation]\n"

Also, like what was done for yield(), perhaps
some kernel-doc content would be useful.

See -next commit 8e3fabfde445a872c8aec2296846badf24d7c8b4


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