consensus: define MaxGasLimit as a const in params (#24092)

* consensus: use the maxGasLimit constant to check the header.GasLimit to avoid creating new variables repeatedly

* consensus: check the header.GasLimit by the public constant MaxGasLimit

* consensus: check the header.GasLimit by the constant MaxGasLimit

consensus/beacon/consensus.go

@@ -26,6 +26,7 @@ import (
 	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/trie"
 )
@@ -196,9 +197,8 @@ func (beacon *Beacon) verifyHeader(chain consensus.ChainHeaderReader, header, pa
 		return fmt.Errorf("invalid difficulty: have %v, want %v", header.Difficulty, beaconDifficulty)
 	}
 	// Verify that the gas limit is <= 2^63-1
-	cap := uint64(0x7fffffffffffffff)
-	if header.GasLimit > cap {
-		return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, cap)
+	if header.GasLimit > params.MaxGasLimit {
+		return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, params.MaxGasLimit)
 	}
 	// Verify that the gasUsed is <= gasLimit
 	if header.GasUsed > header.GasLimit {

consensus/clique/clique.go

@@ -295,9 +295,8 @@ func (c *Clique) verifyHeader(chain consensus.ChainHeaderReader, header *types.H
 		}
 	}
 	// Verify that the gas limit is <= 2^63-1
-	cap := uint64(0x7fffffffffffffff)
-	if header.GasLimit > cap {
-		return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, cap)
+	if header.GasLimit > params.MaxGasLimit {
+		return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, params.MaxGasLimit)
 	}
 	// If all checks passed, validate any special fields for hard forks
 	if err := misc.VerifyForkHashes(chain.Config(), header, false); err != nil {

consensus/ethash/consensus.go

@@ -281,9 +281,8 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainHeaderReader, header, pa
 		return fmt.Errorf("invalid difficulty: have %v, want %v", header.Difficulty, expected)
 	}
 	// Verify that the gas limit is <= 2^63-1
-	cap := uint64(0x7fffffffffffffff)
-	if header.GasLimit > cap {
-		return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, cap)
+	if header.GasLimit > params.MaxGasLimit {
+		return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, params.MaxGasLimit)
 	}
 	// Verify that the gasUsed is <= gasLimit
 	if header.GasUsed > header.GasLimit {

params/protocol_params.go

@@ -19,9 +19,10 @@ package params
 import "math/big"
 
 const (
-	GasLimitBoundDivisor uint64 = 1024    // The bound divisor of the gas limit, used in update calculations.
-	MinGasLimit          uint64 = 5000    // Minimum the gas limit may ever be.
-	GenesisGasLimit      uint64 = 4712388 // Gas limit of the Genesis block.
+	GasLimitBoundDivisor uint64 = 1024               // The bound divisor of the gas limit, used in update calculations.
+	MinGasLimit          uint64 = 5000               // Minimum the gas limit may ever be.
+	MaxGasLimit          uint64 = 0x7fffffffffffffff // Maximum the gas limit (2^63-1).
+	GenesisGasLimit      uint64 = 4712388            // Gas limit of the Genesis block.
 
 	MaximumExtraDataSize  uint64 = 32    // Maximum size extra data may be after Genesis.
 	ExpByteGas            uint64 = 10    // Times ceil(log256(exponent)) for the EXP instruction.