linux-kernel - Re: [PATCH v5 16/20] scripts/gdb: Add internal helper and convenience function for per-cpu lookup

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Message-ID: <20130129141202.GH14302@pd.tnic>
Date:	Tue, 29 Jan 2013 15:12:02 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>,
	Ben Widawsky <ben@...dawsk.net>,
	"David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: Re: [PATCH v5 16/20] scripts/gdb: Add internal helper and
 convenience function for per-cpu lookup

On Tue, Jan 29, 2013 at 02:56:56PM +0100, Jan Kiszka wrote:
> Let me guess: You are dumping a weird QEMU/KVM CPU, right?

Nah, I actually have the silicon! :-)

Joking, of course. I wish. I'm booting the guest with -cpu phenom (it
has been like that since forever in my boot-kernel-in-kvm script) but
the host is Intel.

If I do this on an AMD host, all is ok:

(gdb) p $lx_per_cpu("cpu_info").x86_vendor_id
$1 = "AuthenticAMD\000\000\000"
(gdb) p $lx_per_cpu("cpu_info").x86_model_id
$2 = "AMD Phenom(tm) 9550 Quad-Core Processor", '\000' <repeats 24 times>
(gdb)

[ … ]

> >> +class PerCpu(gdb.Function):
> >> +	__doc__ = "Return per-cpu variable.\n" \
> >> +		  "\n" \
> >> +		  "$lx_per_cpu(\"VAR\"[, CPU]): Return the per-cpu variable called VAR for the\n" \
> >> +		  "given CPU number. If CPU is omitted, the CPU of the current context is used.\n" \
> >> +		  "Note that VAR has to be quoted as string."
> > 
> > 
> > Ok, seriously now:
> > 
> > apropos shows the "Return per-cpu... " line above. Have you found out
> > which gdb command shows the rest? help and info both say "Undefined
> > command".
> 
> help function lx_...
> 
> It took me a while to find this, too.

Maybe worth documenting it then at the end of gdb-kernel-debugging.txt?

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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