x86/cpu_entry_area: Annotate percpu_setup_exception_stacks() as __init

After a recent LLVM change that deduces __cold on functions that only call
cold code (such as __init functions), there is a section mismatch warning
from percpu_setup_exception_stacks(), which got moved to .text.unlikely. as
a result of that optimization:

WARNING: modpost: vmlinux: section mismatch in reference:
percpu_setup_exception_stacks+0x3a (section: .text.unlikely.) ->
cea_map_percpu_pages (section: .init.text)

Drop the inline keyword, which does not guarantee inlining, and replace it
with __init, as percpu_setup_exception_stacks() is only called from __init
code, which clears up the warning.

Signed-off-by: Nathan Chancellor <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/all/2[e-mail]

arch/x86/mm/cpu_entry_area.c

···
 	}
 }
 #else
-static inline void percpu_setup_exception_stacks(unsigned int cpu)
+static void __init percpu_setup_exception_stacks(unsigned int cpu)
 {
 	struct cpu_entry_area *cea = get_cpu_entry_area(cpu);