question about boot_params global variables

[shiyu chou]

Hello all:
In arch x86 directory I found two global variables with the same
name(master branch):
1.arch/x86/boot/main.c
near line 18: struct boot_params boot_params __attribute__((aligned(16)));
2.arch/x86/kernel/setup.c
near line 75: struct boot_params boot_params;
Is that wrong to define two global variables with the same name? And when
use extern to reference the variable,which one did it reference?
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