From: Linus Torvalds torvalds@linux-foundation.org
commit 1a263ae60b04de959d9ce9caea4889385eefcc7b upstream.
gcc-10 has started warning about conflicting types for a few new built-in functions, particularly 'free()'.
This results in warnings like:
crypto/xts.c:325:13: warning: conflicting types for built-in function ‘free’; expected ‘void(void *)’ [-Wbuiltin-declaration-mismatch]
because the crypto layer had its local freeing functions called 'free()'.
Gcc-10 is in the wrong here, since that function is marked 'static', and thus there is no chance of confusion with any standard library function namespace.
But the simplest thing to do is to just use a different name here, and avoid this gcc mis-feature.
[ Side note: gcc knowing about 'free()' is in itself not the mis-feature: the semantics of 'free()' are special enough that a compiler can validly do special things when seeing it.
So the mis-feature here is that gcc thinks that 'free()' is some restricted name, and you can't shadow it as a local static function.
Making the special 'free()' semantics be a function attribute rather than tied to the name would be the much better model ]
Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- crypto/lrw.c | 4 ++-- crypto/xts.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
--- a/crypto/lrw.c +++ b/crypto/lrw.c @@ -531,7 +531,7 @@ static void exit_tfm(struct crypto_skcip crypto_free_skcipher(ctx->child); }
-static void free(struct skcipher_instance *inst) +static void free_inst(struct skcipher_instance *inst) { crypto_drop_skcipher(skcipher_instance_ctx(inst)); kfree(inst); @@ -642,7 +642,7 @@ static int create(struct crypto_template inst->alg.encrypt = encrypt; inst->alg.decrypt = decrypt;
- inst->free = free; + inst->free = free_inst;
err = skcipher_register_instance(tmpl, inst); if (err) --- a/crypto/xts.c +++ b/crypto/xts.c @@ -469,7 +469,7 @@ static void exit_tfm(struct crypto_skcip crypto_free_cipher(ctx->tweak); }
-static void free(struct skcipher_instance *inst) +static void free_inst(struct skcipher_instance *inst) { crypto_drop_skcipher(skcipher_instance_ctx(inst)); kfree(inst); @@ -580,7 +580,7 @@ static int create(struct crypto_template inst->alg.encrypt = encrypt; inst->alg.decrypt = decrypt;
- inst->free = free; + inst->free = free_inst;
err = skcipher_register_instance(tmpl, inst); if (err)