linux-kernel - Re: [PATCH v2 22/44] mmap: Pass through vmi iterator to __split

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Date:   Mon, 9 Jan 2023 20:30:50 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     SeongJae Park <sj@...nel.org>
CC:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 22/44] mmap: Pass through vmi iterator to __split_vma()

* SeongJae Park <sj@...nel.org> [230109 14:28]:
> On Mon, 9 Jan 2023 16:45:46 +0000 Liam Howlett <liam.howlett@...cle.com> wrote:
> 
> > * SeongJae Park <sj@...nel.org> [230106 21:40]:
> > > Hello Liam,
> > > 
> > > On Sat, 7 Jan 2023 02:01:26 +0000 SeongJae Park <sj@...nel.org> wrote:
> > > 
> > > > Hello Liam,
> > > > 
> > > > 
> > > > I found 'make install' mm-unstable kernel fails from initramfs stage with
> > > > 'not a dynamic executable' message.  I confirmed the issue is not reproducible
> > > > before your patchset[1] but after the series[2].
> > > > 
> > > > I tried to bisect, but on a commit[3] middle of mm-unstable tree which this
> > > > patch is applied, I get below error while booting.  Do you have an idea?
> > > 
> > > I further bisected for the boot failure.  The first bad commit was a8e0f2e12936
> > > ("mmap: change do_mas_munmap and do_mas_aligned_munmap() to use vma
> > > iterator")[1].  The stacktrace on the commit is as below.
> > > 
> > ...
> > 
> > Thanks for your work on this.
> > 
> > I have found the issue and will send out a fix shortly.  I am not
> > handling the invalidated state correctly in the write path.
> 
> Thank you, I tested the patch and confirmed it is fixing the boot failure.  The
> 'make install' issue on my system is not fixed yet, though.  While doing bisect
> of the issue again with your boot failure fix, I found below build failure on a
> commit applying a patch of this series, namely "userfaultfd: use vma iterator".
> 
>     mm/madvise.c: In function ‘madvise_update_vma’:
>     mm/madvise.c:165:11: error: implicit declaration of function ‘__split_vma’; did you mean ‘split_vma’? [-Werror=implicit-function-declaration]
>       165 |   error = __split_vma(mm, vma, start, 1);
>           |           ^~~~~~~~~~~
>           |           split_vma
>     cc1: some warnings being treated as errors
> 
> Maybe "mm: add temporary vma iterator versions of vma_merge(), split_vma(), and
> __split_vma()" caused the build failure?

Yes, it seems I removed the external declaration before the function.
Thanks.