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Date:   Sun, 10 Jan 2021 09:44:44 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     syzbot <syzbot+5b0d0de84d6c65b8dd2b@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: upstream build error (11)

On Sat, Jan 9, 2021 at 11:34 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Sat, 9 Jan 2021 21:41:23 +0100 Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
> > On Wed, Oct 28, 2020 at 9:31 AM syzbot
> > <syzbot+5b0d0de84d6c65b8dd2b@...kaller.appspotmail.com> wrote:
> > >
> > > Hello,
> > >
> > > syzbot found the following issue on:
> > >
> > > HEAD commit:    4d09c1d9 Merge tag 'devicetree-fixes-for-5.10-1' of git://..
> > > git tree:       upstream
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=1615899c500000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=a5c844e56cc50cdb
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=5b0d0de84d6c65b8dd2b
> > > compiler:       gcc (GCC) 10.1.0-syz 20200507
> > >
> > > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > > Reported-by: syzbot+5b0d0de84d6c65b8dd2b@...kaller.appspotmail.com
> > >
> > > mm/process_vm_access.c:277:5: error: implicit declaration of function 'in_compat_syscall'; did you mean 'in_ia32_syscall'? [-Werror=implicit-function-declaration]
> >
> > Other build failures are piling behind this.
> >
> > #syz fix: mm/process_vm_access: Add missing #include <linux/compat.h>

/\/\/\/\/\/\/\/\

This was already fixed by this commit:
https://www.spinics.net/lists/linux-mm/msg232500.html



> For some reason I cant reproduce this with that .config, but presumably
> this is the fix?
>
>
> From: Andrew Morton <akpm@...ux-foundation.org>
> Subject: mm/process_vm_access.c: include compat.h
>
> mm/process_vm_access.c:277:5: error: implicit declaration of function 'in_compat_syscall'; did you mean 'in_ia32_syscall'? [-Werror=implicit-function-declaration]
>
> Fixes: 38dc5079da7081e "Fix compat regression in process_vm_rw()"
> Reported-by: syzbot+5b0d0de84d6c65b8dd2b@...kaller.appspotmail.com
> Cc: Kyle Huey <me@...ehuey.com>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Christoph Hellwig <hch@....de>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>
>  mm/process_vm_access.c |    1 +
>  1 file changed, 1 insertion(+)
>
> --- a/mm/process_vm_access.c~a
> +++ a/mm/process_vm_access.c
> @@ -9,6 +9,7 @@
>  #include <linux/mm.h>
>  #include <linux/uio.h>
>  #include <linux/sched.h>
> +#include <linux/compat.h>
>  #include <linux/sched/mm.h>
>  #include <linux/highmem.h>
>  #include <linux/ptrace.h>
> _
>
> --
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