linux-kernel - [PATCH] KEYS: trusted: Pass argument by pointer in dump

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Message-ID: <aPcHHJ29mTHCzVjM@gondor.apana.org.au>
Date: Tue, 21 Oct 2025 12:07:56 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Meenakshi Aggarwal <meenakshi.aggarwal@....com>,
	Pankaj Gupta <pankaj.gupta@....com>,
	Linux Crypto List <linux-crypto@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: [PATCH] KEYS: trusted: Pass argument by pointer in dump_options

On Mon, Oct 20, 2025 at 02:07:35PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the crypto tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
> 
> security/keys/trusted-keys/trusted_caam.c: In function 'dump_options':
> security/keys/trusted-keys/trusted_caam.c:37:20: note: the ABI of passing struct with a flexible array member has changed in GCC 4.4
>    37 | static inline void dump_options(struct caam_pkey_info pkey_info)
>       |                    ^~~~~~~~~~~~
> 
> Introduced by commit
> 
>   9eb25ca6c973 ("KEYS: trusted: caam based protected key")
> 
> I am not sure what to do about this.  It would be nice if we could
> suppress the note as we do not support gcc 4.4 any more.  Otherwise,
> I suspect that converting the pkey_info argument to a pointer will get
> rid of the note.

Yes let's change that into a pointer:

---8<---
Instead of passing pkey_info into dump_options by value, using a
pointer instead.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/security/keys/trusted-keys/trusted_caam.c b/security/keys/trusted-keys/trusted_caam.c
index 090099d1b04d..601943ce0d60 100644
--- a/security/keys/trusted-keys/trusted_caam.c
+++ b/security/keys/trusted-keys/trusted_caam.c
@@ -29,12 +29,12 @@ static const match_table_t key_tokens = {
 };
 
 #ifdef CAAM_DEBUG
-static inline void dump_options(struct caam_pkey_info pkey_info)
+static inline void dump_options(const struct caam_pkey_info *pkey_info)
 {
-	pr_info("key encryption algo %d\n", pkey_info.key_enc_algo);
+	pr_info("key encryption algo %d\n", pkey_info->key_enc_algo);
 }
 #else
-static inline void dump_options(struct caam_pkey_info pkey_info)
+static inline void dump_options(const struct caam_pkey_info *pkey_info)
 {
 }
 #endif
@@ -108,7 +108,7 @@ static int trusted_caam_seal(struct trusted_key_payload *p, char *datablob)
 		ret = get_pkey_options(datablob, &info.pkey_info);
 		if (ret < 0)
 			return 0;
-		dump_options(info.pkey_info);
+		dump_options(&info.pkey_info);
 	}
 
 	ret = caam_encap_blob(blobifier, &info);
@@ -140,7 +140,7 @@ static int trusted_caam_unseal(struct trusted_key_payload *p, char *datablob)
 		ret = get_pkey_options(datablob, &info.pkey_info);
 		if (ret < 0)
 			return 0;
-		dump_options(info.pkey_info);
+		dump_options(&info.pkey_info);
 
 		p->key_len = p->blob_len + sizeof(struct caam_pkey_info);
 		memcpy(p->key, &info.pkey_info, sizeof(struct caam_pkey_info));
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt