* Include guard macro query
@ 2012-04-19 6:54 Pritam Bankar
2012-04-19 7:10 ` Philipp Ittershagen
0 siblings, 1 reply; 2+ messages in thread
From: Pritam Bankar @ 2012-04-19 6:54 UTC (permalink / raw)
To: kernelnewbies
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 ???
Thanks
--
Pritam Bankar
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20120419/868b57cc/attachment.html
^ permalink raw reply [flat|nested] 2+ messages in thread
* Include guard macro query
2012-04-19 6:54 Include guard macro query Pritam Bankar
@ 2012-04-19 7:10 ` Philipp Ittershagen
0 siblings, 0 replies; 2+ messages in thread
From: Philipp Ittershagen @ 2012-04-19 7:10 UTC (permalink / raw)
To: kernelnewbies
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
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2012-04-19 7:10 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-04-19 6:54 Include guard macro query Pritam Bankar
2012-04-19 7:10 ` Philipp Ittershagen
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).