April 19, 2012
7:10 a.m.
On Thu, Apr 19, 2012 at 12:24:42PM +0530, Pritam Bankar wrote:
Hi,
In Linux code we add a guard macro to avoid multiple declarations of identifiers. But I see some macros defined with trailing underscores. e.g. In arch/x86/include/asm/
Normally it is defined like,
#ifndef _ASM_X86_ALTERNATIVE_H #define _ASM_X86_ALTERNATIVE_H
But in some files I see trailing underscore after H ,
e.g. arch/x86/include/asm/intel_scu_ipc.h
#ifndef _ASM_X86_INTEL_SCU_IPC_H_ #define _ASM_X86_INTEL_SCU_IPC_H_
There are others files also arch/x86/include/asm/irqflags.h http://lxr.linux.no/#linux+v3.3.2/arch/x86/include/asm/probe_roms.h
DOES THIS TRAILING UNDERSCORE HAS SPECIAL MEANING ???
My guess: No. Greetings, Philipp