linux-kernel - Re: linux-next: Tree for September 16 (cpustr.h)

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Message-Id: <20080919132822.9abc014f.rdunlap@xenotime.net>
Date:	Fri, 19 Sep 2008 13:28:22 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	x86@...nel.org
Subject: Re: linux-next: Tree for September 16 (cpustr.h)

On Tue, 16 Sep 2008 13:48:25 -0700 H. Peter Anvin wrote:

> Randy.Dunlap wrote:
> > I'm seeing lots of gcc warnings from the generated cpustr.h file, like so:
> > 
> >   arch/x86/boot/mkcpustr > arch/x86/boot/cpustr.h
> >   gcc -Wp,-MD,arch/x86/boot/.cpu.o.d  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.1.1/include -D__KERNEL__ -Iinclude -Iinclude2 -I/home/rdunlap/linsrc/linux-next-20080916/include -I/home/rdunlap/linsrc/linux-next-20080916/arch/x86/include -include include/linux/autoconf.h -I/home/rdunlap/linsrc/linux-next-20080916/arch/x86/boot -Iarch/x86/boot -I/home/rdunlap/linsrc/linux-next-20080916/include -Iinclude -I/home/rdunlap/linsrc/linux-next-20080916/include2 -Iinclude2  -I/home/rdunlap/linsrc/linux-next-20080916/include  -I/home/rdunlap/linsrc/linux-next-20080916/arch/x86/include -include include/linux/autoconf.h -g -Os -D_SETUP -D__KERNEL__ -Wall -Wstrict-prototypes -march=i386 -mregparm=3 -include /home/rdunlap/linsrc/linux-next-20080916/arch/x86/boot/code16gcc.h -fno-strict-aliasing -fomit-frame-pointer -ffreestanding -fno-unit-at-a-time -fno-stack-protector -mpreferred-stack-boundary=2 -m32 -D__BIG_KERNEL__  -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(cpu)"
>   -D"KBUILD_MODNAME=KBUILD_STR(cpu)" -D"DEBUG_HASH=3" -D"DEBUG_HASH2=23" -c -o arch/x86/boot/cpu.o /home/rdunlap/linsrc/linux-next-20080916/arch/x86/boot/cpu.c
> > cc1: warning: hex escape sequence out of range
> > 
> > 
> > The ending lines of cpustr.h include hex strings like "\x111".
> > gcc complains about these.  If I change them to "\x011" (e.g.), there
> > is no warning.
> > 
> 
> Yes, there is a patch that adds a 9th cpuflags word, which this code 
> doesn't handle.  The warning is real, there is an #error in mkcpustr.c 
> which is supposed to trigger, but doesn't because of a typo:
> 
> #if NCAPFLAGS > 8
> # error "Need to adjust the boot code handling of CPUID strings"
> #endif
> 
> (The actual variable is called NCAPINTS.)
> 
> Attached is a completely untested patch for this problem.

That builds cleanly and the produced cpustr.h output file looks good to me.
It's attached for your checking.

---
~Randy

View attachment "cpustr.h" of type "text/x-chdr" (6307 bytes)