crypto: Replaced gcc specific attributes with macros from compiler.h

Continuing from this commit: 52f5684c8e1e
("kernel: use macros from compiler.h instead of __attribute__((...))")

I submitted 4 total patches. They are part of task I've taken up to
increase compiler portability in the kernel. I've cleaned up the
subsystems under /kernel /mm /block and /security, this patch targets
/crypto.

There is <linux/compiler.h> which provides macros for various gcc specific
constructs. Eg: __weak for __attribute__((weak)). I've cleaned all
instances of gcc specific attributes with the right macros for the crypto
subsystem.

I had to make one additional change into compiler-gcc.h for the case when
one wants to use this: __attribute__((aligned) and not specify an alignment
factor. From the gcc docs, this will result in the largest alignment for
that data type on the target machine so I've named the macro
__aligned_largest. Please advise if another name is more appropriate.

Signed-off-by: Gideon Israel Dsouza <gidisrael@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 5 insertions, 4 deletions

diff --git a/crypto/shash.c b/crypto/shash.c
index a051541a4a17..5e31c8d776df 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -19,6 +19,7 @@
 #include <linux/seq_file.h>
 #include <linux/cryptouser.h>
 #include <net/netlink.h>
+#include <linux/compiler.h>
 
 #include "internal.h"
 
@@ -67,7 +68,7 @@ EXPORT_SYMBOL_GPL(crypto_shash_setkey);
 static inline unsigned int shash_align_buffer_size(unsigned len,
 						   unsigned long mask)
 {
-	typedef u8 __attribute__ ((aligned)) u8_aligned;
+	typedef u8 __aligned_largest u8_aligned;
 	return len + (mask & ~(__alignof__(u8_aligned) - 1));
 }
 
@@ -80,7 +81,7 @@ static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
 	unsigned int unaligned_len = alignmask + 1 -
 				     ((unsigned long)data & alignmask);
 	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
-		__attribute__ ((aligned));
+		__aligned_largest;
 	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
 	int err;
 
@@ -116,7 +117,7 @@ static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
 	struct shash_alg *shash = crypto_shash_alg(tfm);
 	unsigned int ds = crypto_shash_digestsize(tfm);
 	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
-		__attribute__ ((aligned));
+		__aligned_largest;
 	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
 	int err;
 
@@ -403,7 +404,7 @@ static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
 #endif
 
 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
-	__attribute__ ((unused));
+	__maybe_unused;
 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 {
 	struct shash_alg *salg = __crypto_shash_alg(alg);