linux-kernel - Re: kernel-doc comment with anonymous variable in anonymous union?

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Message-ID: <aT_s4gzB2w8fLVMh@archie.me>
Date: Mon, 15 Dec 2025 18:11:30 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto <linux-crypto@...r.kernel.org>,
	Linux Documentation <linux-doc@...r.kernel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jonathan Corbet <corbet@....net>
Subject: Re: kernel-doc comment with anonymous variable in anonymous union?

On Mon, Dec 15, 2025 at 05:40:43PM +0800, Herbert Xu wrote:
> On Mon, Dec 15, 2025 at 04:12:44PM +0700, Bagas Sanjaya wrote:
> > Hi,
> > 
> > kernel-doc reports warning on include/crypto/skcipher.h:
> > 
> > WARNING: ./include/crypto/skcipher.h:166 struct member 'SKCIPHER_ALG_COMMON' not described in 'skcipher_alg'
> > 
> > skciper_alg struct is defined as:
> > 
> > struct skcipher_alg {
> > 	int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
> > 	              unsigned int keylen);
> > 	int (*encrypt)(struct skcipher_request *req);
> > 	int (*decrypt)(struct skcipher_request *req);
> > 	int (*export)(struct skcipher_request *req, void *out);
> > 	int (*import)(struct skcipher_request *req, const void *in);
> > 	int (*init)(struct crypto_skcipher *tfm);
> > 	void (*exit)(struct crypto_skcipher *tfm);
> > 
> > 	unsigned int walksize;
> > 
> > 	union {
> > 		struct SKCIPHER_ALG_COMMON;
> > 		struct skcipher_alg_common co;
> > 	};
> > };
> > 
> > Note the first member in the union, which is an anonymous (i.e. unnamed) variable.
> > 
> > What can I do on it? Should the offending member be deleted?
> 
> You could either add a comment about SKCIPHER_ALG_COMMON, or
> fix up all the code that uses it by adding "co."

But that SKCIPHER_ALG_COMMON doesn't have any variable name, though.

Jon?

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