From: Linus Torvalds torvalds@linux-foundation.org
[ Upstream commit 1a263ae60b04de959d9ce9caea4889385eefcc7b ]
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: Sasha Levin sashal@kernel.org --- crypto/lrw.c | 6 +++--- crypto/xts.c | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/crypto/lrw.c b/crypto/lrw.c index fda9414890865..1a47ff9dc5ea1 100644 --- a/crypto/lrw.c +++ b/crypto/lrw.c @@ -289,7 +289,7 @@ static void exit_tfm(struct crypto_skcipher *tfm) 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); @@ -401,12 +401,12 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb) inst->alg.encrypt = encrypt; inst->alg.decrypt = decrypt;
- inst->free = free; + inst->free = free_inst;
err = skcipher_register_instance(tmpl, inst); if (err) { err_free_inst: - free(inst); + free_inst(inst); } return err; } diff --git a/crypto/xts.c b/crypto/xts.c index 73c648c373595..eead546d3124d 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -328,7 +328,7 @@ static void exit_tfm(struct crypto_skcipher *tfm) 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); @@ -439,12 +439,12 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb) inst->alg.encrypt = encrypt; inst->alg.decrypt = decrypt;
- inst->free = free; + inst->free = free_inst;
err = skcipher_register_instance(tmpl, inst); if (err) { err_free_inst: - free(inst); + free_inst(inst); } return err; }