kernel 2.6.4: Exported symbol isn't found by snd.ko

slackerman · n00b Joined: 22 Feb 2004 Posts: 72 Location: Palo Alto, CA

This may not be limited to just amd64/x86-64.

Here's what I get when I try to build the kernel with nearly the same config as with the 2.6.3:

WARNING: /lib/modules/2.6.4-gentoo/kernel/sound/core/snd.ko needs unknown symbol memcpy_fromio
WARNING: /lib/modules/2.6.4-gentoo/kernel/sound/core/snd.ko needs unknown symbol memcpy_toio

Sure enough, if I look in the generated snd.mod.c file, no memcpy_toio or memcpy_fromio... On a quick pass, it looks like the two functions *are* being exported in ./arch/x86_64/lib/io.c...

Any ideas?

Not a big deal, as I have a stable 2.6.3.... just wondered if anyone else has hit this problem.

Cheers,

- Brendan

Damasz · Posted: Sun Mar 14, 2004 4:33 pm Post subject:

Yeah, got the same error message. So back to 2.6.3 for now...

thumper · Guru Joined: 06 Dec 2002 Posts: 396 Location: Venice FL

I just got it as well, did either of you already file a bug report that I can add too?

slackerman · n00b Joined: 22 Feb 2004 Posts: 72 Location: Palo Alto, CA

thumper,

Just posted it. I suspect it's something to do with the "versions" symbols table that is created for the modules. If you look at the generated snd.mod.c in a 2.6.4 tree versus a 2.6.3 tree, you'll see that only the 2.6.4 version is missing the symbols.

I'm not *that* much of a kernel hacker, so this is beyond me....for now. I do know that the requested/required symbols do exist and are compiled in:

./arch/x86_64/lib/io.c

Not sure what the EXPORT_SYMBOL macro is doing, but either it is failing or the code that generates *.mod.c is...

Cheers,

slackerman

ballyn · n00b Joined: 14 Aug 2003 Posts: 73

I got this too the other day... mm1 didn't have the same problem, but it was pretty much broken (had to patch a line or two by hand, panics at boot).

I haven't tried mm2 yet... anyone else have any luck with 2.6.4 flavors? There's supposed to be a good chunk of new 64-bit stuff.

ballyn · n00b Joined: 14 Aug 2003 Posts: 73

Actually, I just noticed this in the changelog for the bk1 vanilla snapshot dated 3-10:

slackerman · n00b Joined: 22 Feb 2004 Posts: 72 Location: Palo Alto, CA

I didn't see any ksyms.c for the x86_64 platform.

It does, however, seem like a toolchain problem. Like I stated, earlier, it is either in exporting the symbols or in generating the snd.mod.c file (which contains a table of exported symbols...)

Not a big deal that this doesn't work....2.6.3 seems to be functioning just fine, for me, right now...

Cheers,

- slackerman

thumper · Guru Joined: 06 Dec 2002 Posts: 396 Location: Venice FL

Thought I'd try mm-sources (2.6.4-mm2) and got this:

wgauvin · Posted: Tue Mar 16, 2004 4:18 am Post subject:

Glad to see I'm not the only one with the problem of memcpy_toio and memcpy_fromio. Has anyone raised a bug for this?

At least I have a 2.6.3 kernel, but for those doing a new install are most likely going to be without sound until this is fixed.
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Xelrach · n00b Joined: 04 Jan 2004 Posts: 11

gentoo-dev-sources 2.6.4 works for me, but I have everything built in to the kernel, no modules. You might want to try that.

slackerman · n00b Joined: 22 Feb 2004 Posts: 72 Location: Palo Alto, CA

Bug 44725 is the bug that y'all can add comments to, if you're so inclined...

- slackerman

wgauvin · Posted: Tue Mar 16, 2004 4:56 am Post subject:

argh, slakerman beat me to it, I raised one too 44800.
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ballyn · n00b Joined: 14 Aug 2003 Posts: 73

bk4 fixed the problem for me... I'd expect to see this fixed in dev-sources soon.

Damasz · Posted: Tue Mar 16, 2004 7:59 am Post subject:

Cool, it's fixed in 2.6.4-gentoo-r1.

thither · n00b Joined: 04 Feb 2004 Posts: 32

scoobydu · Posted: Tue Mar 16, 2004 8:56 pm Post subject:

thither · n00b Joined: 04 Feb 2004 Posts: 32

Looks like this is bug 44703.

mallchin · Posted: Sun Mar 21, 2004 1:03 am Post subject:

Disabling Preemptible Kernel support should fix it.
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mallchin · Posted: Sun Mar 21, 2004 1:09 am Post subject:

srs5694 · Posted: Sun Mar 21, 2004 2:28 am Post subject:

I haven't tried 2.6.4-r1, but when I got this error (or something very much like it; I don't recall precisely), I went back and compiled sound support into the kernel proper. That worked around the problem.

scoobydu · Posted: Tue Mar 23, 2004 10:33 pm Post subject: