From: Vladimír Čunát <vladimir.cunat@nic.cz>
Date: Wed, 6 Aug 2025 14:09:25 +0000 (+0200)
Subject: lib/kru nit: shrink the USE_AES version of `struct kru` by 64 bytes
X-Git-Tag: v6.0.17~2^2~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c9d0e25107cd58f81c4eff754d015fe45b10de1c;p=thirdparty%2Fknot-resolver.git

lib/kru nit: shrink the USE_AES version of `struct kru` by 64 bytes

Just by dropping some padding in the header.
Also drop a long outdated part of comment on this.
---

diff --git a/lib/kru.inc.c b/lib/kru.inc.c
index d5d2baac0..b556f1680 100644
--- a/lib/kru.inc.c
+++ b/lib/kru.inc.c
@@ -83,7 +83,8 @@ struct load_cl {
 static_assert(64 == sizeof(struct load_cl), "bad size of struct load_cl");
 
 /// Parametrization for speed of decay.
-struct decay_config {
+//  Packed to allow unpadded following by more data in the USE_AES version of struct kru.
+struct __attribute__((packed)) decay_config {
 	/// Bit shift per tick, fractional
 	double shift_bits;
 
@@ -96,7 +97,7 @@ struct decay_config {
 struct kru {
 #if USE_AES
 	/// Hashing secret.  Random but shared by all users of the table.
-	/// Let's not make it too large, so that header fits into 64 Bytes.
+	/// Let's not make it too large.
 	_Alignas(32) char hash_key[48];
 #else
 	/// Hashing secret.  Random but shared by all users of the table.