linux-kernel - Re: [PATCH 2.6.21-rc1] Extend print

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Message-Id: <20070305175402.1803cbd3.akpm@linux-foundation.org>
Date:	Mon, 5 Mar 2007 17:54:02 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Robert Peterson <rpeterso@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21-rc1] Extend print_symbol capability TRY #2

On Mon, 5 Mar 2007 17:37:56 -0800
Randy Dunlap <randy.dunlap@...cle.com> wrote:

> On Mon, 05 Mar 2007 18:03:59 -0600 Robert Peterson wrote:
> 
> > This is try #2 for this patch, with corrections based on feedback. 
> > It is the same as the previous patch except:
> > (1) The function has been renamed from lookup_symbol to sprint_symbol
> >     as requested by Paulo Marques.
> > (2) I fixed the "return NULL;" to "return;" as pointed out by Paulo Marques
> >     for the case where the kallsyms function is not selected in .config
> > (3) I changed EXPORT_SYMBOL to EXPORT_SYMBOL_GPL as
> >     requested by Roman Zippel. (Andrew, I thought you said you changed this,
> >     but I didn't see it in mm1).
> > 
> > I hope this patch attaches with proper spacing and without word wrap.
> > If it doesn't, my apologies (I'm using Thunderbird, but suggestions 
> > welcome).
> > 
> > Original comment:
> > 
> > Today's print_symbol function dumps a kernel symbol with printk.
> > This patch extends the functionality of kallsyms.c so that the symbol
> > lookup function may be used without the printk.  This is
> > useful for modules that want to dump symbols elsewhere, for
> > example, to debugfs.  I intend to use the new function call in the
> > GFS2 file system (which will be a separate patch).
> > 
> > Signed-off-by: Robert Peterson <rpeterso@...hat.com>
> > ---
> 
> argh, attachment, harder to review/comment on....
> 
> I had commented on this comment, but you seem to have missed it.
> 
> +/* Replace "%s" in format with address, or returns -errno. */
> +void __print_symbol(const char *fmt, unsigned long address)
> +{
> 
> This function does not "returns -errno" at all.

I think the arguments to sprint_symbol() are backwards.  Would prefer

	sprint_symbol(char *buffer, unsigned long addr)

like all the other print-into-a-buffer functions.
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