linux-kernel - Re: linux-next: build failure after merge of the bpf-next tree

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Message-ID: <20240718114916.7fab0442@canb.auug.org.au>
Date: Thu, 18 Jul 2024 11:49:16 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Benjamin Tissoires <bentiss@...nel.org>
Cc: Jiri Kosina <jikos@...nel.org>, David Miller <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Mark
 Brown <broonie@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Alexei
 Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, bpf
 <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>, Kui-Feng Lee
 <thinker.li@...il.com>, Martin KaFai Lau <martin.lau@...nel.org>,
 linux-input@...r.kernel.org, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the bpf-next tree

Hi all,

On Wed, 10 Jul 2024 09:13:44 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> On Mon, 17 Jun 2024 19:15:59 +0100 Mark Brown <broonie@...nel.org> wrote:
> >
> > After merging the bpf-next tree, today's linux-next build (x86_64
> > allmodconfig) failed like this:
> > 
> > /tmp/next/build/drivers/hid/bpf/hid_bpf_struct_ops.c:280:16: error: initialization of 'int (*)(void *, struct bpf_link *)' from incompatible pointer type 'int (*)(void *)' [-Werror=incompatible-pointer-types]
> >   280 |         .reg = hid_bpf_reg,
> >       |                ^~~~~~~~~~~
> > /tmp/next/build/drivers/hid/bpf/hid_bpf_struct_ops.c:280:16: note: (near initialization for 'bpf_hid_bpf_ops.reg')
> > /tmp/next/build/drivers/hid/bpf/hid_bpf_struct_ops.c:281:18: error: initialization of 'void (*)(void *, struct bpf_link *)' from incompatible pointer type 'void (*)(void *)' [-Werror=incompatible-pointer-types]
> >   281 |         .unreg = hid_bpf_unreg,
> >       |                  ^~~~~~~~~~~~~
> > /tmp/next/build/drivers/hid/bpf/hid_bpf_struct_ops.c:281:18: note: (near initialization for 'bpf_hid_bpf_ops.unreg')
> > 
> > Caused by commit
> > 
> >   73287fe228721b ("bpf: pass bpf_struct_ops_link to callbacks in bpf_struct_ops.")
> > 
> > interacting with commit
> > 
> >   ebc0d8093e8c97 ("HID: bpf: implement HID-BPF through bpf_struct_ops")
> > 
> > from the HID tree.
> > 
> > I've fixed it up as below:
> > 
> > From e8aeaba00440845f9bd8d6183ca5d7383a678cd3 Mon Sep 17 00:00:00 2001
> > From: Mark Brown <broonie@...nel.org>
> > Date: Mon, 17 Jun 2024 19:02:27 +0100
> > Subject: [PATCH] HID: bpf: Fix up build
> > 
> > Fix up build error due to 73287fe228721b ("bpf: pass bpf_struct_ops_link to callbacks in bpf_struct_ops.")
> > 
> > Signed-off-by: Mark Brown <broonie@...nel.org>
> > ---
> >  drivers/hid/bpf/hid_bpf_struct_ops.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/hid/bpf/hid_bpf_struct_ops.c b/drivers/hid/bpf/hid_bpf_struct_ops.c
> > index 5f200557ff12b..744318e7d936b 100644
> > --- a/drivers/hid/bpf/hid_bpf_struct_ops.c
> > +++ b/drivers/hid/bpf/hid_bpf_struct_ops.c
> > @@ -175,7 +175,7 @@ static int hid_bpf_ops_init_member(const struct btf_type *t,
> >  	return 0;
> >  }
> >  
> > -static int hid_bpf_reg(void *kdata)
> > +static int hid_bpf_reg(void *kdata, struct bpf_link *link)
> >  {
> >  	struct hid_bpf_ops *ops = kdata;
> >  	struct hid_device *hdev;
> > @@ -229,7 +229,7 @@ static int hid_bpf_reg(void *kdata)
> >  	return err;
> >  }
> >  
> > -static void hid_bpf_unreg(void *kdata)
> > +static void hid_bpf_unreg(void *kdata, struct bpf_link *link)
> >  {
> >  	struct hid_bpf_ops *ops = kdata;
> >  	struct hid_device *hdev;
> > -- 
> > 2.39.2
> >   
> 
> This fixup is now required when the hid and next-next trees are merged.

And now this is needed when the hid tree is merged with Linus' tree.

-- 
Cheers,
Stephen Rothwell

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