linux-kernel - Re: [PATCH] x86: Use enum instead of literals for trap values

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Date:	Fri, 01 Feb 2013 18:18:36 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	John Kacur <jkacur@...hat.com>
Cc:	stable@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Clark Williams <williams@...hat.com>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: Use enum instead of literals for trap values

On Tue, 2013-01-22 at 23:44 +0100, John Kacur wrote:
> From: Kees Cook <keescook@...omium.org>
> 
> commit c94082656dac74257f63e91f78d5d458ac781fa5 upstream
> 
> The traps are referred to by their numbers and it can be difficult to
> understand them while reading the code without context. This patch adds
> enumeration of the trap numbers and replaces the numbers with the correct
> enum for x86.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Link: http://lkml.kernel.org/r/20120310000710.GA32667@www.outflux.net
> Signed-off-by: H. Peter Anvin <hpa@...or.com>
> Cherry-picked-for: v2.3.37
> 
> This fixes the following build error
> make O=/bld/v3.2.37
> make[2]: Nothing to be done for `relocs'.
>   Using /home/jkacur/linux-rt as source for kernel
>   GEN     /bld/v3.2.37/Makefile
>   CHK     include/linux/version.h
>   CHK     include/generated/utsrelease.h
>   CALL    /home/jkacur/linux-rt/scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   CHK     kernel/config_data.h
>   CC [M]  drivers/misc/sgi-xp/xpc_main.o
> /home/jkacur/linux-rt/drivers/misc/sgi-xp/xpc_main.c: In function ‘xpc_system_die’:
> /home/jkacur/linux-rt/drivers/misc/sgi-xp/xpc_main.c:1208: error: ‘X86_TRAP_DF’ undeclared (first use in this function)
> /home/jkacur/linux-rt/drivers/misc/sgi-xp/xpc_main.c:1208: error: (Each undeclared identifier is reported only once
> /home/jkacur/linux-rt/drivers/misc/sgi-xp/xpc_main.c:1208: error: for each function it appears in.)
> /home/jkacur/linux-rt/drivers/misc/sgi-xp/xpc_main.c:1211: error: ‘X86_TRAP_MF’ undeclared (first use in this function)
> /home/jkacur/linux-rt/drivers/misc/sgi-xp/xpc_main.c:1212: error: ‘X86_TRAP_XF’ undeclared (first use in this function)
> make[4]: *** [drivers/misc/sgi-xp/xpc_main.o] Error 1
> make[3]: *** [drivers/misc/sgi-xp] Error 2
> make[2]: *** [drivers/misc] Error 2
> make[1]: *** [drivers] Error 2
> make: *** [sub-make] Error 2
[...]

Queued up for 3.2, thanks.  I've also added X86_UV and SGI_XP to the
x86 .config I build.

Ben.

-- 
Ben Hutchings
Everything should be made as simple as possible, but not simpler.
                                                           - Albert Einstein

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