Raise minimum stake delegation to 1 SOL (#24603)

programs/stake/src/lib.rs

@@ -5,7 +5,11 @@
     note = "Please use `solana_sdk::stake::program::id` or `solana_program::stake::program::id` instead"
 )]
 pub use solana_sdk::stake::program::{check_id, id};
-use solana_sdk::{feature_set::FeatureSet, genesis_config::GenesisConfig};
+use solana_sdk::{
+    feature_set::{self, FeatureSet},
+    genesis_config::GenesisConfig,
+    native_token::LAMPORTS_PER_SOL,
+};
 
 pub mod config;
 pub mod stake_instruction;
@@ -19,10 +23,12 @@ pub fn add_genesis_accounts(genesis_config: &mut GenesisConfig) -> u64 {
 /// NOTE: This is also used to calculate the minimum balance of a stake account, which is the
 /// rent exempt reserve _plus_ the minimum stake delegation.
 #[inline(always)]
-pub fn get_minimum_delegation(_feature_set: &FeatureSet) -> u64 {
-    // If/when the minimum delegation amount is changed, the `feature_set` parameter will be used
-    // to chose the correct value.  And since the MINIMUM_STAKE_DELEGATION constant cannot be
-    // removed, use it here as to not duplicate magic constants.
-    #[allow(deprecated)]
-    solana_sdk::stake::MINIMUM_STAKE_DELEGATION
+pub fn get_minimum_delegation(feature_set: &FeatureSet) -> u64 {
+    if feature_set.is_active(&feature_set::stake_raise_minimum_delegation_to_1_sol::id()) {
+        const MINIMUM_DELEGATION_SOL: u64 = 1;
+        MINIMUM_DELEGATION_SOL * LAMPORTS_PER_SOL
+    } else {
+        #[allow(deprecated)]
+        solana_sdk::stake::MINIMUM_STAKE_DELEGATION
+    }
 }