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authorLinus Torvalds <torvalds@linux-foundation.org>2011-11-06 19:44:47 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-06 19:44:47 -0800
commit32aaeffbd4a7457bf2f7448b33b5946ff2a960eb (patch)
treefaf7ad871d87176423ff9ed1d1ba4d9c688fc23f /include/linux/export.h
parentMerge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux (diff)
parentRevert "tracing: Include module.h in define_trace.h" (diff)
downloadlinux-dev-32aaeffbd4a7457bf2f7448b33b5946ff2a960eb.tar.xz
linux-dev-32aaeffbd4a7457bf2f7448b33b5946ff2a960eb.zip
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
* 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits) Revert "tracing: Include module.h in define_trace.h" irq: don't put module.h into irq.h for tracking irqgen modules. bluetooth: macroize two small inlines to avoid module.h ip_vs.h: fix implicit use of module_get/module_put from module.h nf_conntrack.h: fix up fallout from implicit moduleparam.h presence include: replace linux/module.h with "struct module" wherever possible include: convert various register fcns to macros to avoid include chaining crypto.h: remove unused crypto_tfm_alg_modname() inline uwb.h: fix implicit use of asm/page.h for PAGE_SIZE pm_runtime.h: explicitly requires notifier.h linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h miscdevice.h: fix up implicit use of lists and types stop_machine.h: fix implicit use of smp.h for smp_processor_id of: fix implicit use of errno.h in include/linux/of.h of_platform.h: delete needless include <linux/module.h> acpi: remove module.h include from platform/aclinux.h miscdevice.h: delete unnecessary inclusion of module.h device_cgroup.h: delete needless include <linux/module.h> net: sch_generic remove redundant use of <linux/module.h> net: inet_timewait_sock doesnt need <linux/module.h> ... Fix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in - drivers/media/dvb/frontends/dibx000_common.c - drivers/media/video/{mt9m111.c,ov6650.c} - drivers/mfd/ab3550-core.c - include/linux/dmaengine.h
Diffstat (limited to 'include/linux/export.h')
-rw-r--r--include/linux/export.h89
1 files changed, 89 insertions, 0 deletions
diff --git a/include/linux/export.h b/include/linux/export.h
new file mode 100644
index 000000000000..696c0f48afc7
--- /dev/null
+++ b/include/linux/export.h
@@ -0,0 +1,89 @@
+#ifndef _LINUX_EXPORT_H
+#define _LINUX_EXPORT_H
+/*
+ * Export symbols from the kernel to modules. Forked from module.h
+ * to reduce the amount of pointless cruft we feed to gcc when only
+ * exporting a simple symbol or two.
+ *
+ * If you feel the need to add #include <linux/foo.h> to this file
+ * then you are doing something wrong and should go away silently.
+ */
+
+/* Some toolchains use a `_' prefix for all user symbols. */
+#ifdef CONFIG_SYMBOL_PREFIX
+#define MODULE_SYMBOL_PREFIX CONFIG_SYMBOL_PREFIX
+#else
+#define MODULE_SYMBOL_PREFIX ""
+#endif
+
+struct kernel_symbol
+{
+ unsigned long value;
+ const char *name;
+};
+
+#ifdef MODULE
+extern struct module __this_module;
+#define THIS_MODULE (&__this_module)
+#else
+#define THIS_MODULE ((struct module *)0)
+#endif
+
+#ifdef CONFIG_MODULES
+
+#ifndef __GENKSYMS__
+#ifdef CONFIG_MODVERSIONS
+/* Mark the CRC weak since genksyms apparently decides not to
+ * generate a checksums for some symbols */
+#define __CRC_SYMBOL(sym, sec) \
+ extern void *__crc_##sym __attribute__((weak)); \
+ static const unsigned long __kcrctab_##sym \
+ __used \
+ __attribute__((section("___kcrctab" sec "+" #sym), unused)) \
+ = (unsigned long) &__crc_##sym;
+#else
+#define __CRC_SYMBOL(sym, sec)
+#endif
+
+/* For every exported symbol, place a struct in the __ksymtab section */
+#define __EXPORT_SYMBOL(sym, sec) \
+ extern typeof(sym) sym; \
+ __CRC_SYMBOL(sym, sec) \
+ static const char __kstrtab_##sym[] \
+ __attribute__((section("__ksymtab_strings"), aligned(1))) \
+ = MODULE_SYMBOL_PREFIX #sym; \
+ static const struct kernel_symbol __ksymtab_##sym \
+ __used \
+ __attribute__((section("___ksymtab" sec "+" #sym), unused)) \
+ = { (unsigned long)&sym, __kstrtab_##sym }
+
+#define EXPORT_SYMBOL(sym) \
+ __EXPORT_SYMBOL(sym, "")
+
+#define EXPORT_SYMBOL_GPL(sym) \
+ __EXPORT_SYMBOL(sym, "_gpl")
+
+#define EXPORT_SYMBOL_GPL_FUTURE(sym) \
+ __EXPORT_SYMBOL(sym, "_gpl_future")
+
+#ifdef CONFIG_UNUSED_SYMBOLS
+#define EXPORT_UNUSED_SYMBOL(sym) __EXPORT_SYMBOL(sym, "_unused")
+#define EXPORT_UNUSED_SYMBOL_GPL(sym) __EXPORT_SYMBOL(sym, "_unused_gpl")
+#else
+#define EXPORT_UNUSED_SYMBOL(sym)
+#define EXPORT_UNUSED_SYMBOL_GPL(sym)
+#endif
+
+#endif /* __GENKSYMS__ */
+
+#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)
+
+#endif /* CONFIG_MODULES */
+
+#endif /* _LINUX_EXPORT_H */