Re: 2.6.17-mm2

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Fri, Jun 30, 2006 at 12:38:13AM -0700, Randy.Dunlap wrote:
> Until modpost (or whatever) can do this, here are a few that
> a shell script has found for me by examing source code only --
> may contain some false reports:
> 
> ./arch/arm/mach-at91rm9200/gpio.c:81:EXPORT_SYMBOL(at91_set_A_periph)
> ./arch/arm/mach-at91rm9200/gpio.c:67:int __init_or_module at91_set_A_periph(unsigned pin, int use_pullup)
> 
> ./arch/arm/mach-at91rm9200/gpio.c:101:EXPORT_SYMBOL(at91_set_B_periph);
> ./arch/arm/mach-at91rm9200/gpio.c:87:int __init_or_module at91_set_B_periph(unsigned pin, int use_pullup)
> 
> ./arch/arm/mach-at91rm9200/gpio.c:122:EXPORT_SYMBOL(at91_set_gpio_input);
> ./arch/arm/mach-at91rm9200/gpio.c:108:int __init_or_module at91_set_gpio_input(unsigned pin, int use_pullup)
> 
> ./arch/arm/mach-at91rm9200/gpio.c:144:EXPORT_SYMBOL(at91_set_gpio_output);
> ./arch/arm/mach-at91rm9200/gpio.c:129:int __init_or_module at91_set_gpio_output(unsigned pin, int value)
> 
> ./arch/arm/mach-at91rm9200/gpio.c:160:EXPORT_SYMBOL(at91_set_deglitch);
> ./arch/arm/mach-at91rm9200/gpio.c:150:int __init_or_module at91_set_deglitch(unsigned pin, int is_on)
> 
> ./arch/arm/mach-at91rm9200/gpio.c:177:EXPORT_SYMBOL(at91_set_multi_drive);
> ./arch/arm/mach-at91rm9200/gpio.c:166:int __init_or_module at91_set_multi_drive(unsigned pin, int is_on)
>
> ./arch/arm/plat-omap/mux.c:196:EXPORT_SYMBOL(omap_cfg_reg);
> ./arch/arm/plat-omap/mux.c:58:int __init_or_module omap_cfg_reg(const unsigned long index)
> 

These would appear to be false:

#ifdef CONFIG_MODULES
#define __init_or_module
#define __initdata_or_module
#else
#define __init_or_module __init
#define __initdata_or_module __initdata
#endif /*CONFIG_MODULES*/

and:

#else /* !CONFIG_MODULES... */
#define EXPORT_SYMBOL(sym)
#define EXPORT_SYMBOL_GPL(sym)
#define EXPORT_SYMBOL_GPL_FUTURE(sym)
#define EXPORT_UNUSED_SYMBOL(sym)
#define EXPORT_UNUSED_SYMBOL_GPL(sym)

means that in the modules case, they aren't marked as __init and are
exported, but in the non-modular case they are marked as __init but
not exported.

Hence, export symbols marked as __init_or_module is safe.

> ./arch/arm/mach-imx/generic.c:196:EXPORT_SYMBOL(imx_set_mmc_info);
> ./arch/arm/mach-imx/generic.c:192:void __init imx_set_mmc_info(struct imxmmc_platform_data *info)
> 
> ./arch/arm/mach-imx/generic.c:204:EXPORT_SYMBOL(set_imx_fb_info);
> ./arch/arm/mach-imx/generic.c:200:void __init set_imx_fb_info(struct imxfb_mach_info *hard_imx_fb_info)
>
> ./sound/i2c/l3/uda1341.c:929:EXPORT_SYMBOL(snd_chip_uda1341_mixer_new);
> ./sound/i2c/l3/uda1341.c:769:int __init snd_chip_uda1341_mixer_new(struct snd_card *card, struct l3_client **clntp)

These are definitely buggy.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core