linux-kernel - Re: [PATCH] module: fix build when DEBUGP is defined

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Date:	Thu, 13 Jan 2011 08:32:15 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH] module: fix build when DEBUGP is defined

On Thu, 13 Jan 2011 02:56:17 am Randy Dunlap wrote:
> On 01/12/11 00:48, Rusty Russell wrote:
> > On Wed, 12 Jan 2011 11:51:53 am Randy Dunlap wrote:
> >> From: Randy Dunlap <randy.dunlap@...cle.com>
> >>
> >> Fix module loader build when DEBUGP is defined.
> >> Fixes build error & warning:
> >>
> >> kernel/module.c:1910: error: 'name' undeclared (first use in this function)
> >> kernel/module.c:2567: warning: format '%lx' expects type 'long unsigned int', but argument 2 has type 'Elf64_Addr'
> >>
> >> Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
> >> Cc: Rusty Russell <rusty@...tcorp.com.au>
> >> ---
> >>  kernel/module.c |    4 ++--
> >>  1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> --- linux-next-20110111.orig/kernel/module.c
> >> +++ linux-next-20110111/kernel/module.c
> >> @@ -1907,7 +1907,7 @@ static void layout_sections(struct modul
> >>  			    || strstarts(sname, ".init"))
> >>  				continue;
> >>  			s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
> >> -			DEBUGP("\t%s\n", name);
> >> +			DEBUGP("\t%s\n", sname);
> >>  		}
> >>  		switch (m) {
> >>  		case 0: /* executable */
> >> @@ -2563,7 +2563,7 @@ static int move_module(struct module *mo
> >>  			memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
> >>  		/* Update sh_addr to point to copy in image. */
> >>  		shdr->sh_addr = (unsigned long)dest;
> >> -		DEBUGP("\t0x%lx %s\n",
> >> +		DEBUGP("\t0x%llx %s\n",
> >>  		       shdr->sh_addr, info->secstrings + shdr->sh_name);
> > 
> > This will break on 32-bit.  We really need a cast to long here :(
> 
> Really?  I built it on i386 and x86_64 (successfully).

shdr->sh_addr is 32 bit, not a long long.  You should get a warning.

Rusty.
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