[PATCH] crypto: skcipher - Realign struct skcipher_walk to save 8 bytes

From: Thorsten Blum
Date: Fri Apr 11 2025 - 15:22:37 EST


Reduce skcipher_walk's struct size by 8 bytes by realigning its members.

pahole output before:

/* size: 120, cachelines: 2, members: 13 */
/* sum members: 108, holes: 2, sum holes: 8 */
/* padding: 4 */
/* last cacheline: 56 bytes */

and after:

/* size: 112, cachelines: 2, members: 13 */
/* padding: 4 */
/* last cacheline: 48 bytes */

No functional changes intended.

Signed-off-by: Thorsten Blum <thorsten.blum@xxxxxxxxx>
---
include/crypto/internal/skcipher.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index a958ab0636ad..0cad8e7364c8 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -67,8 +67,6 @@ struct skcipher_walk {
struct scatter_walk in;
};

- unsigned int nbytes;
-
union {
/* Virtual address of the destination. */
struct {
@@ -81,6 +79,7 @@ struct skcipher_walk {
struct scatter_walk out;
};

+ unsigned int nbytes;
unsigned int total;

u8 *page;
--
2.49.0