arm64: mm: remove unused cpu_set_idmap_tcr_t0sz function

With commit b08d4640 ("arm64: remove dead code"),
cpu_set_idmap_tcr_t0sz is no longer called and can therefore be removed
from the kernel.

This patch removes the function and effectively inlines the helper
function __cpu_set_tcr_t0sz into cpu_set_default_tcr_t0sz.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/mmu_context.h

@@ -77,34 +77,23 @@ static inline bool __cpu_uses_extended_idmap(void)
 		unlikely(idmap_t0sz != TCR_T0SZ(VA_BITS)));
 }
 
-static inline void __cpu_set_tcr_t0sz(u64 t0sz)
+/*
+ * Set TCR.T0SZ to its default value (based on VA_BITS)
+ */
+static inline void cpu_set_default_tcr_t0sz(void)
 {
 	unsigned long tcr;
 
-	if (__cpu_uses_extended_idmap())
+	if (!__cpu_uses_extended_idmap())
+		return;
+
 	asm volatile (
 	"	mrs	%0, tcr_el1	;"
 	"	bfi	%0, %1, %2, %3	;"
 	"	msr	tcr_el1, %0	;"
 	"	isb"
 	: "=&r" (tcr)
-		: "r"(t0sz), "I"(TCR_T0SZ_OFFSET), "I"(TCR_TxSZ_WIDTH));
-}
-
-/*
- * Set TCR.T0SZ to the value appropriate for activating the identity map.
- */
-static inline void cpu_set_idmap_tcr_t0sz(void)
-{
-	__cpu_set_tcr_t0sz(idmap_t0sz);
-}
-
-/*
- * Set TCR.T0SZ to its default value (based on VA_BITS)
- */
-static inline void cpu_set_default_tcr_t0sz(void)
-{
-	__cpu_set_tcr_t0sz(TCR_T0SZ(VA_BITS));
+	: "r"(TCR_T0SZ(VA_BITS)), "I"(TCR_T0SZ_OFFSET), "I"(TCR_TxSZ_WIDTH));
 }
 
 static inline void switch_new_context(struct mm_struct *mm)