Hi,
How does EXPORT_SYMBOL work ?
All i know is that its a way by which a kernel module can export symbols to
other kernel modules.
Just to get more information on it, i looked for its definition(in
linux/module.h) and found that
its defined as:
#define EXPORT_SYMBOL(sym) \
__EXPORT_SYMBOL(sym, "")
where,
#define __EXPORT_SYMBOL(sym, sec) \
extern typeof(sym) sym; \
__CRC_SYMBOL(sym, sec) \
static const char __kstrtab_##sym[] \
__attribute__((section("__ksymtab_strings"))) \
= MODULE_SYMBOL_PREFIX #sym; \
static const struct kernel_symbol __ksymtab_##sym \
__attribute_used__ \
__attribute__((section("__ksymtab" sec), unused)) \
= { (unsigned long)&sym, __kstrtab_##sym }
please throw some light here for me to understand this complex
substitution,
Also, EXPORT_SYMBOL_GPL seems to be a way to letting the modules Only under
GPL License
(MODULE_VERSION("GPL")) to be able to use the exported symbols ?
Thanks,
~amit
--
"Everyone has a photographic memory. Some people just don't have film."
— Mel Brooks
