init: introduce boot param alias
RFC 1/1 init: introduce boot param alias
By introducing the macroses __setup_alias and early_param_alias we are allowed to use boot param aliases.
Here is an example:
static int __init parse_func(char *arg)
{
/* set some flag or do something */
return 0;
}early_param("param1", parse_func);early_param_alias("param1-alias", parse_func);
Signed-off-by Cyrill Gorcunov <[email protected]>
---
I found it usefull while was looking for APIC code merging. Please review! Any comments are _quite_welcome_!!!
I use __LINE__ macro to define salt for names. Not sure if this is really that good way to produce unique names. But anyway i think it's better then define different functions with same functionallity.
I'm on really slow GPRS connection now and can't reply fast so forgive me for that :)
include/linux/init.h +19 -0
@@ -247,6 +247,25 @@ struct obs_kernel_param {#define early_param (str, fn) \ __setup_param(str, fn, fn, 1) +/* +* Sometimes we need to define boot parameter alias +* ie different boot options with the same functionality +* so we could use one parsing function for all of them +* NOTE: these macroses _MUST_ be placed on different lines +*/ +#define __setup_param_alias (str, unique_id, salt, fn, early) \ + static char __setup_str_##unique_id##salt[] __initdata __aligned(1) = str; \ + static struct obs_kernel_param __setup_##unique_id##salt \ + __used __section(.init.setup) \ + __attribute__((aligned((sizeof(long))))) \ + = { __setup_str_##unique_id##salt, fn, early } + +#define __setup_alias (str, fn) \ + __setup_param_alias(str, fn, __LINE__, fn, 0) + +#define early_param_alias (str, fn) \ + __setup_param_alias(str, fn, __LINE__, fn, 1) +/* Relies on boot_command_line being set */ void __init parse_early_param (void );#endif /* __ASSEMBLY__ */