riscv: mm: Make asid_bits a local variable

This variable is only used inside asids_init().

Reviewed-by: Alexandre Ghiti <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: SiFiveHolland

arch/riscv/mm/context.c

@@ -20,7 +20,6 @@
 
 DEFINE_STATIC_KEY_FALSE(use_asid_allocator);
 
-static unsigned long asid_bits;
 static unsigned long num_asids;
 
 static atomic_long_t current_version;
@@ -226,7 +225,7 @@ static inline void set_mm(struct mm_struct *prev,
 
 static int __init asids_init(void)
 {
-	unsigned long old;
+	unsigned long asid_bits, old;
 
 	/* Figure-out number of ASID bits in HW */
 	old = csr_read(CSR_SATP);