From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Gabriel Paubert <paubert@iram.es>
Cc: Wrobel Heinz-R39252 <r39252@freescale.com>,
Michael Ellerman <michael@ellerman.id.au>,
Steffen Rumler <steffen.rumler.ext@nsn.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: kernel panic during kernel module load (powerpc specific part)
Date: Tue, 05 Jun 2012 08:00:42 +1000 [thread overview]
Message-ID: <1338847242.7150.83.camel@pasglop> (raw)
In-Reply-To: <20120604110305.GA16707@visitor2.iram.es>
On Mon, 2012-06-04 at 13:03 +0200, Gabriel Paubert wrote:
> There is no conflict to the ABI. These functions are supposed to be
> directly reachable from whatever code
> section may need them.
>
> Now I have a question: how did you get the need for this?
>
> None of my kernels uses them:
> - if I compile with -O2, the compiler simply expands epilogue and
> prologue to series of lwz and stw
> - if I compile with -Os, the compiler generates lmw/stmw which give
> the smallest possible cache footprint
>
> Neither did I find a single reference to these functions in several
> systems that I grepped for.
Newer gcc's ... even worse, with -Os, it does it for a single register
spill afaik. At least that's how I hit it with grub2 using whatever gcc
is in fc17.
Cheers,
Ben.
next prev parent reply other threads:[~2012-06-04 22:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-30 14:33 kernel panic during kernel module load (powerpc specific part) Steffen Rumler
2012-05-30 23:24 ` Michael Ellerman
2012-05-31 7:04 ` Wrobel Heinz-R39252
2012-05-31 11:04 ` Gabriel Paubert
2012-06-01 9:18 ` Benjamin Herrenschmidt
2012-06-01 11:33 ` Wrobel Heinz-R39252
2012-06-04 7:43 ` Steffen Rumler
2012-06-04 10:53 ` Paul Mackerras
2012-06-04 11:03 ` Gabriel Paubert
2012-06-04 22:00 ` Benjamin Herrenschmidt [this message]
2012-06-05 10:44 ` Gabriel Paubert
2012-06-05 22:47 ` Benjamin Herrenschmidt
2012-06-05 11:32 ` Gabriel Paubert
2012-06-05 22:14 ` Benjamin Herrenschmidt
2012-06-06 7:36 ` Steffen Rumler
2012-06-06 11:32 ` Benjamin Herrenschmidt
2012-06-06 14:37 ` [PATCH] " Steffen Rumler
2012-06-21 15:27 ` roger blofeld
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