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earlycon: mark earlycon code as __used iif the caller is built-in 

Keep earlycon related symbols only when CONFIG_SERIAL_EARLYCON is
enabled and the driver is built-in.  This will be helpful to clean
up ifdefs surrounding earlycon code in serial drivers.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Masahiro Yamada 2016-06-06 18:41:00 +09:00 committed by Greg Kroah-Hartman
parent 4ef03d3287
commit f8ba3647f3
1 changed files with 7 additions and 1 deletions
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8
include/linux/serial_core.h
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@ -352,9 +352,15 @@ struct earlycon_id {
extern const struct earlycon_id __earlycon_table[];
extern const struct earlycon_id __earlycon_table_end[];
#if defined(CONFIG_SERIAL_EARLYCON) && !defined(MODULE)
#define EARLYCON_USED_OR_UNUSED __used
#else
#define EARLYCON_USED_OR_UNUSED __maybe_unused
#endif
#define OF_EARLYCON_DECLARE(_name, compat, fn) \
static const struct earlycon_id __UNIQUE_ID(__earlycon_##_name) \
__used __section(__earlycon_table) \
EARLYCON_USED_OR_UNUSED __section(__earlycon_table) \
= { .name = __stringify(_name), \
.compatible = compat, \
.setup = fn }