the file with the same name

[孙建希]

hello,

I found there's many files with same name in kernel.
e.g:
include/asm/linkage.h
arch/x86/include/asm/linkage.h

I know when compile for x86, kbuild will use x86 linkage.h. But how？use
#ifndef or anything other?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20141123/2d46b93f/attachment.html