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

Greg Kroah-Hartman
2020-01-14T10:10:59Z

From: Will Deacon <will.deacon@arm.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@arm.com>
[Just a portion of the original patch]
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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)