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Since CONFIG_X86_64 selects CONFIG_X86_LOCAL_APIC, the following condition: #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC) is equivalent to: #if defined(CONFIG_X86_LOCAL_APIC) ... and we can eliminate that #ifdef by providing an empty init_bsp_APIC() stub in the !CONFIG_X86_LOCAL_APIC case. Also add some comments to explain why we call init_bsp_APIC(). Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: mroos@linux.ee Cc: ville.syrjala@linux.intel.com Link: http://lkml.kernel.org/r/20180117073748.23905-1-douly.fnst@cn.fujitsu.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.