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env: remove callback.o for an SPL build

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env.h says this about about callback declarations (U_BOOT_ENV_CALLBACK):

 * For SPL these are silently dropped to reduce code size, since environment
 * callbacks are not supported with SPL.

So env_callback_init() does a lot of work to not find anything in the
guaranteed empty env_clbk list. Drop callback.o entirely from the link
and stub out the only public function defined in callback.o. This cuts
about 600 bytes from the SPL on my ppc build.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Rasmus Villemoes 2020-02-27 13:56:10 +00:00 committed by Tom Rini
parent 532de8d99c
commit e13df08a26
2 changed files with 7 additions and 1 deletions
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2
env/Makefile vendored
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@ -7,9 +7,9 @@ obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += common.o
obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += env.o
obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += attr.o
obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += flags.o
obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += callback.o
ifndef CONFIG_SPL_BUILD
obj-y += callback.o
obj-$(CONFIG_ENV_IS_IN_EEPROM) += eeprom.o
extra-$(CONFIG_ENV_IS_EMBEDDED) += embedded.o
obj-$(CONFIG_ENV_IS_IN_EEPROM) += embedded.o

6
include/env_callback.h
View file

@ -72,6 +72,12 @@
"serial#:serialno," \
CONFIG_ENV_CALLBACK_LIST_STATIC
#ifndef CONFIG_SPL_BUILD
void env_callback_init(struct env_entry *var_entry);
#else
static inline void env_callback_init(struct env_entry *var_entry)
{
}
#endif
#endif /* __ENV_CALLBACK_H__ */