linux-kernel - Question about EXPORT

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Message-ID: <38b2ab8a0702090807m133e8f89n9857b8f7814e3685@mail.gmail.com>
Date:	Fri, 9 Feb 2007 17:07:41 +0100
From:	"Francis Moreau" <francis.moro@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Question about EXPORT_SYMBOL implementation

Hi,

Here is the implementation of EXPORT_SYMBOL:

#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 }


I'm wondering why it's using '__attribute_used__' _and_
'__attribute__((section("__ksymtab" sec), unused)'. Isn't the unused
attribute redundant with '__attribute_used__' ?

thanks
-- 
Francis
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