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

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Date: Mon, 25 Mar 2024 10:49:34 -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 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.

    $ git diff
    diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
    index c8a42ecbd7a2..8fe274e9f3a4 100644
    --- a/arch/um/os-Linux/main.c
    +++ b/arch/um/os-Linux/main.c
    @@ -16,6 +16,7 @@
     #include <kern_util.h>
     #include <os.h>
     #include <um_malloc.h>
    +#include <linux/vmalloc.h>
    
     #define PGD_BOUND (4 * 1024 * 1024)
     #define STACKSIZE (8 * 1024 * 1024)
    $
    $ ./tools/testing/kunit/kunit.py run --build_dir ../kunit.out/
    [10:43:13] Configuring KUnit Kernel ...
    [10:43:13] 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:In file included from .../arch/um/kernel/asm-offsets.c:1:
    .../arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: warning: no previous prototype for ‘foo’ [-Wmissing-prototypes]
        9 | void foo(void)
          |      ^~~
    In file included from .../include/linux/alloc_tag.h:8,
                     from .../include/linux/vmalloc.h:5,
                     from .../arch/um/os-Linux/main.c:19:
    .../include/linux/bug.h:5:10: fatal error: asm/bug.h: No such file or directory
        5 | #include <asm/bug.h>
          |          ^~~~~~~~~~~
    compilation terminated.


Thanks,
SJ

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