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env: don't generate callback list entries for SPL 

SPL doesn't write to the environment.  These list entries prevent the
functions from being garbage-collected, even though nothing will look at
the list.  This caused several SPL builds (e.g.  P2020RDB-PC_NAND) to
break due to size limitations and/or unresolved symbols.

A static inline function is used to provide a context in which we
can consume the callback, and thus avoid unused function warnings.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: Joe Hershberger <joe.hershberger@gmail.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
This commit is contained in:
Scott Wood 2012-12-20 11:51:05 +00:00 committed by Tom Rini
parent da77a0e593
commit f8cfcf1b1c
1 changed files with 8 additions and 0 deletions
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8
include/env_callback.h
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@ -68,8 +68,16 @@ void env_callback_init(ENTRY *var_entry);
* when associated through the ".callbacks" environment variable, the callback
* will be executed any time the variable is inserted, overwritten, or deleted.
*/
#ifdef CONFIG_SPL_BUILD
#define U_BOOT_ENV_CALLBACK(name, callback) \
static inline void _u_boot_env_noop_##name(void) \
{ \
(void)callback; \
}
#else
#define U_BOOT_ENV_CALLBACK(name, callback) \
ll_entry_declare(struct env_clbk_tbl, name, env_clbk, env_clbk) = \
{#name, callback}
#endif
#endif /* __ENV_CALLBACK_H__ */