_setup()

System.map中有很多函数的链接，其中有些以__setup开头的函数，其定义如下：

 

/*
 * Only for really core code.  See moduleparam.h for the normal way.
 *
 * Force the alignment so the compiler doesn't space elements of the
 * obs_kernel_param "array" too far apart in .init.setup.
 */
#define __setup_param(str, unique_id, fn, early)            /
    static const char __setup_str_##unique_id[] __initconst    /
        __aligned(1) = str; /
    static struct obs_kernel_param __setup_##unique_id    /
        __used __section(.init.setup)            /
        __attribute__((aligned((sizeof(long)))))    /
        = { __setup_str_##unique_id, fn, early }

#define __setup(str, fn)                    /
    __setup_param(str, fn, fn, 0)

/* NOTE: fn is as per module_param, not __setup!  Emits warning if fn
 * returns non-zero. */
#define early_param(str, fn)                    /
    __setup_param(str, fn, fn, 1)

 

__setup("init=", init_setup)

__setup_param("init=", init_setup, init_setup, 0)

static const char __setup_str_init_setup[] __initconst    /
        __aligned(1) = "init="; /
    static struct obs_kernel_param __setup_init_setup    /
        __used __section(.init.setup)            /
        __attribute__((aligned((sizeof(long)))))    /
        = { __setup_str_init_setup, init_setup, 0}

c002cfbc t __setup_init_setup

 

early_param("initrd", early_initrd)

__setup_param("initrd", early_initrd, early_initrd, 1)

    static const char __setup_str_early_initrd[] __initconst    /
        __aligned(1) = "initrd"; /
    static struct obs_kernel_param __setup_early_initrd    /
        __used __section(.init.setup)            /
        __attribute__((aligned((sizeof(long)))))    /
        = { __setup_str_early_initrd, early_initrd, 1}
c002d0d0 t __setup_early_initrd