arm64: cpufeature: Avoid warnings due to unused symbols

An allnoconfig build complains about unused symbols due to functions
that are called via conditional cpufeature and cpu_errata table entries.

Annotate these as __maybe_unused if they are likely to be generic, or
predicate their compilation on the same option as the table entry if
they are specific to a given alternative.

Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 381bb4077563..071a4548a231 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -838,11 +838,6 @@ static bool has_no_hw_prefetch(const struct arm64_cpu_capabilities *entry, int _
 		MIDR_CPU_VAR_REV(1, MIDR_REVISION_MASK));
 }
 
-static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused)
-{
-	return is_kernel_in_hyp_mode();
-}
-
 static bool hyp_offset_low(const struct arm64_cpu_capabilities *entry,
 			   int __unused)
 {
@@ -1022,6 +1017,12 @@ static bool has_hw_dbm(const struct arm64_cpu_capabilities *cap,
 
 #endif
 
+#ifdef CONFIG_ARM64_VHE
+static bool runs_at_el2(const struct arm64_cpu_capabilities *entry, int __unused)
+{
+	return is_kernel_in_hyp_mode();
+}
+
 static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused)
 {
 	/*
@@ -1035,6 +1036,7 @@ static void cpu_copy_el2regs(const struct arm64_cpu_capabilities *__unused)
 	if (!alternatives_applied)
 		write_sysreg(read_sysreg(tpidr_el1), tpidr_el2);
 }
+#endif
 
 static const struct arm64_cpu_capabilities arm64_features[] = {
 	{