linux-kernel - [PATCH 4.14 33/39] arm64: cpufeature: Avoid warnings due to unused symbols

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Date:   Tue, 14 Jan 2020 11:02:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Will Deacon <will.deacon@....com>,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Subject: [PATCH 4.14 33/39] arm64: cpufeature: Avoid warnings due to unused symbols

From: Will Deacon <will.deacon@....com>

commit 12eb369125abe92bfc55e9ce198200f5807b63ff upstream.

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@....com>
[Just a portion of the original patch]
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/kernel/cpufeature.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -799,11 +799,6 @@ static bool has_no_hw_prefetch(const str
 		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)
 {
@@ -937,6 +932,12 @@ static int __init parse_kpti(char *str)
 }
 early_param("kpti", parse_kpti);
 
+#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)
 {
 	/*
@@ -950,6 +951,7 @@ static void cpu_copy_el2regs(const struc
 	if (!alternatives_applied)
 		write_sysreg(read_sysreg(tpidr_el1), tpidr_el2);
 }
+#endif
 
 #ifdef CONFIG_ARM64_SSBD
 static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr)