linux-kernel - Re: [PATCH v6 30/37] mm: vmalloc: Enable memory allocation profiling

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Date: Tue, 26 Mar 2024 08:39:54 -0700
From: SeongJae Park <sj@...nel.org>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: SeongJae Park <sj@...nel.org>,
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Subject: Re: [PATCH v6 30/37] mm: vmalloc: Enable memory allocation profiling

On Tue, 26 Mar 2024 00:51:21 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:

> On Mon, Mar 25, 2024 at 11:20 AM SeongJae Park <sj@...nel.org> wrote:
> >
> > On Mon, 25 Mar 2024 10:59:01 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:
> >
> > > On Mon, Mar 25, 2024 at 10:49 AM SeongJae Park <sj@...nel.org> wrote:
> > > >
> > > > On Mon, 25 Mar 2024 14:56:01 +0000 Suren Baghdasaryan <surenb@...gle.com> wrote:
> > > >
> > > > > On Sat, Mar 23, 2024 at 6:05 PM SeongJae Park <sj@...nel.org> wrote:
> > > > > >
> > > > > > Hi Suren and Kent,
> > > > > >
> > > > > > On Thu, 21 Mar 2024 09:36:52 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:
> > > > > >
> > > > > > > From: Kent Overstreet <kent.overstreet@...ux.dev>
> > > > > > >
> > > > > > > This wrapps all external vmalloc allocation functions with the
> > > > > > > alloc_hooks() wrapper, and switches internal allocations to _noprof
> > > > > > > variants where appropriate, for the new memory allocation profiling
> > > > > > > feature.
> > > > > >
> > > > > > I just noticed latest mm-unstable fails running kunit on my machine as below.
> > > > > > 'git-bisect' says this is the first commit of the failure.
> > > > > >
> > > > > >     $ ./tools/testing/kunit/kunit.py run --build_dir ../kunit.out/
> > > > > >     [10:59:53] Configuring KUnit Kernel ...
> > > > > >     [10:59:53] Building KUnit Kernel ...
> > > > > >     Populating config with:
> > > > > >     $ make ARCH=um O=../kunit.out/ olddefconfig
> > > > > >     Building with:
> > > > > >     $ make ARCH=um O=../kunit.out/ --jobs=36
> > > > > >     ERROR:root:/usr/bin/ld: arch/um/os-Linux/main.o: in function `__wrap_malloc':
> > > > > >     main.c:(.text+0x10b): undefined reference to `vmalloc'
> > > > > >     collect2: error: ld returned 1 exit status
> > > > > >
> > > > > > Haven't looked into the code yet, but reporting first.  May I ask your idea?
> > > > >
> > > > > Hi SeongJae,
> > > > > Looks like we missed adding "#include <linux/vmalloc.h>" inside
> > > > > arch/um/os-Linux/main.c in this patch:
> > > > > https://lore.kernel.org/all/20240321163705.3067592-2-surenb@google.com/.
> > > > > I'll be posing fixes for all 0-day issues found over the weekend and
> > > > > will include a fix for this. In the meantime, to work around it you
> > > > > can add that include yourself. Please let me know if the issue still
> > > > > persists after doing that.
> > > >
> > > > Thank you, Suren.  The change made the error message disappears.  However, it
> > > > introduced another one.
> > >
> > > Ok, let me investigate and I'll try to get a fix for it today evening.
> >
> > Thank you for this kind reply.  Nonetheless, this is not blocking some real
> > thing from me.  So, no rush.  Plese take your time :)
> 
> I posted a fix here:
> https://lore.kernel.org/all/20240326073750.726636-1-surenb@google.com/
> Please let me know if this resolves the issue.

I confirmed it is fixing the issue, and replied to the patch with my Tested-by:
tag.  Thank you for this kind fix, Suren.


Thanks,
SJ

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