From: Peter Chubb gcc-4.2 is a lot more picky about its symbol handling. EXPORT_SYMBOL no longer works on symbols that are undefined or defined with static scope. For example, with CONFIG_PROFILE off, I see: kernel/profile.c:206: error: __ksymtab_profile_event_unregister causes a section type conflict kernel/profile.c:205: error: __ksymtab_profile_event_register causes a section type conflict This patch moves the EXPORTs inside the #ifdef CONFIG_PROFILE, so we only try to export symbols that are defined. Also, in kernel/kprobes.c there's an EXPORT_SYMBOL_GPL() for jprobes_return, which if CONFIG_JPROBES is undefined is a static inline and gives the same error. And in drivers/acpi/resources/rsxface.c, there's an ACPI_EXPORT_SYMBOPL() for a static symbol. If it's static, it's not accessible from outside the compilation unit, so should bot be exported. These three changes allow building a zx1_defconfig kernel with gcc 4.2 on IA64. Signed-off-by: Peter Chubb Cc: Prasanna S Panchamukhi Cc: Ananth N Mavinakayanahalli Cc: Anil S Keshavamurthy Cc: "Luck, Tony" Cc: Len Brown Signed-off-by: Andrew Morton --- drivers/acpi/resources/rsxface.c | 2 -- kernel/kprobes.c | 4 +++- kernel/profile.c | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-) diff -puN drivers/acpi/resources/rsxface.c~fix-compilation-with-gcc-42 drivers/acpi/resources/rsxface.c --- a/drivers/acpi/resources/rsxface.c~fix-compilation-with-gcc-42 +++ a/drivers/acpi/resources/rsxface.c @@ -474,8 +474,6 @@ acpi_rs_match_vendor_resource(struct acp return (AE_CTRL_TERMINATE); } -ACPI_EXPORT_SYMBOL(acpi_rs_match_vendor_resource) - /******************************************************************************* * * FUNCTION: acpi_walk_resources diff -puN kernel/kprobes.c~fix-compilation-with-gcc-42 kernel/kprobes.c --- a/kernel/kprobes.c~fix-compilation-with-gcc-42 +++ a/kernel/kprobes.c @@ -1063,6 +1063,8 @@ EXPORT_SYMBOL_GPL(register_kprobe); EXPORT_SYMBOL_GPL(unregister_kprobe); EXPORT_SYMBOL_GPL(register_jprobe); EXPORT_SYMBOL_GPL(unregister_jprobe); -EXPORT_SYMBOL_GPL(jprobe_return); + +#ifdef CONFIG_KPROBES EXPORT_SYMBOL_GPL(register_kretprobe); EXPORT_SYMBOL_GPL(unregister_kretprobe); +#endif diff -puN kernel/profile.c~fix-compilation-with-gcc-42 kernel/profile.c --- a/kernel/profile.c~fix-compilation-with-gcc-42 +++ a/kernel/profile.c @@ -199,11 +199,11 @@ EXPORT_SYMBOL_GPL(register_timer_hook); EXPORT_SYMBOL_GPL(unregister_timer_hook); EXPORT_SYMBOL_GPL(task_handoff_register); EXPORT_SYMBOL_GPL(task_handoff_unregister); +EXPORT_SYMBOL_GPL(profile_event_register); +EXPORT_SYMBOL_GPL(profile_event_unregister); #endif /* CONFIG_PROFILING */ -EXPORT_SYMBOL_GPL(profile_event_register); -EXPORT_SYMBOL_GPL(profile_event_unregister); #ifdef CONFIG_SMP /* _