linux-kernel - Re: include: linux: slab: kmalloc_trace undefined when compiling drivers

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Message-ID: <Y3Ky54xVZdY2IT9L@rhino>
Date:   Mon, 14 Nov 2022 16:28:07 -0500
From:   Ian Cowan <ian@...ux.cowan.aero>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>, cl@...ux.com,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        roman.gushchin@...ux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: include: linux: slab: kmalloc_trace undefined when compiling
 drivers

On Mon, Nov 14, 2022 at 05:56:25PM +0100, Vlastimil Babka wrote:
> On 11/14/22 13:39, Ian Cowan wrote:
> > On Mon, Nov 14, 2022 at 05:59:06PM +0900, Hyeonggon Yoo wrote:
> >> On Sat, Nov 12, 2022 at 08:21:14PM -0500, Ian Cowan wrote:
> >> > On Sat, Nov 12, 2022 at 05:11:27PM -0800, Randy Dunlap wrote:
> >> > > 
> >> > > 
> >> > > On 11/12/22 16:43, Ian Cowan wrote:
> >> > > > On Sat, Nov 12, 2022 at 04:34:18PM -0800, Randy Dunlap wrote:
> >> > > >>
> >> > > >>
> >> > > >> On 11/12/22 13:59, Ian Cowan wrote:
> >> > > >>> On Sat, Nov 12, 2022 at 09:21:34AM -0800, Randy Dunlap wrote:
> >> > > >>>> Hi--
> >> > > >>>>
> >> > > >>>> On 11/12/22 08:37, Ian Cowan wrote:
> >> > > >>>>> When compiling drivers (speficially drivers/pci/hotplug), I am receiving
> >> > > >>>>> the following modpost error for both `kmalloc_trace` and
> >> > > >>>>> `kmalloc_node_trace` on the staging/staging-next branch:
> >> > > >>>>>
> >> > > >>
> >> > > >> Ian, what do you mean by "on the staging/staging-next branch"?
> >> > > >>
> >> > > >> What kernel version are you trying to build?
> >> > > >>
> >> > > >> The .config that you sent is for v6.1.0-rc1.
> >> > > > 
> >> > > > I am building from the staging repository (gregkh/staging) and my
> >> > > > working branch when building is staging-next. So I am trying to build
> >> > > > from staging and not a particular version. I have also run `make modules_prepare`
> >> > > > and updated the .config per that script. However, when I do build
> >> > > > v6.1.0-rc1 from the main repository (torvalds/linux), I run into the same problem.
> >> > > 
> >> > > Have you built the entire kernel already and then you are trying to build
> >> > > only drivers/pci/hotplug?
> >> > Yes, I did build the entire kernel already and then I'm just trying to
> >> > rebuild that module.
> >> > 
> >> > In `include/linux/slab.h` if I remove the lines between `#ifdef
> >> > CONFIG_TRACING` and `#else` (lines 473-480) and then the corresponding
> >> > `#endif` and leave lines 481-499, I'm able to compile that module
> >> > without issue.
> >> 
> >> I don't get what the problem is.
> >> In case kmalloc[_node]_trace() is undefined, it's replaced with kmem_cache_alloc[_node]. 
> >> 
> >> Is the kernel built with same config on tree?
> > 
> > Yes, the same config on tree with no errors or warnings. I was able to
> > trace it back to this commit - building on the commit immediately prior
> > builds without error or warning. It looks like this commit does some
> > refactoring of the kmem_cache_alloc[_node] and kmalloc[_node]_trace.
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git/commit/?h=staging-next&id=26a40990ba052
> 
> Wonder if you have a stale mm/slab_common.o because for some reason it's not
> being recompiled (a file timestamp in the future?)
> Can you rm it and rebuild? And maybe also mm/built-in.a
> Or maybe a full make clean and/or a fresh checkout.
> 

I pulled a fresh checkout and rebuilt everything and it was fixed after
that. Thanks for your help!