commit 219c7b06f3da9ac2b51ed671881b20f1b127daef
author Mathieu Malaterre <malat@debian.org> Sat Mar 10 19:06:45 2018 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Thu Mar 15 17:42:55 2018 +0100
tree cea1131aa6eff4d640b3642b9ffd56ce9f337764
parent 7d8f68619e4f530e19c17e7c0d04f0a791891a77

powerpc: Mark the variable earlycon_acpi_spcr_enable maybe_unused

Re-use the object-like macro EARLYCON_USED_OR_UNUSED to mark
`earlycon_acpi_spcr_enable` as maybe_unused.

Fix the following warning (treated as error in W=1)

  CC      arch/powerpc/kernel/setup-common.o
In file included from ./include/linux/serial_8250.h:14:0,
                 from arch/powerpc/kernel/setup-common.c:33:
./include/linux/serial_core.h:382:19: error: ‘earlycon_acpi_spcr_enable’ defined but not used [-Werror=unused-const-variable=]
 static const bool earlycon_acpi_spcr_enable;
                   ^~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/serial_core.h

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index b32df49..1d35610 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -379,7 +379,7 @@ extern int of_setup_earlycon(const struct earlycon_id *match,
 extern bool earlycon_acpi_spcr_enable __initdata;
 int setup_earlycon(char *buf);
 #else
-static const bool earlycon_acpi_spcr_enable;
+static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED;
 static inline int setup_earlycon(char *buf) { return 0; }
 #endif