Hi Mark,
I'm sorry for not getting back to you sooner. I have been traveling
since my last message.
I guess this patch is for the HID tree. The changes in this patch are great.
However, I suggest you implement ".update" if you think it is
reasonable for HID,
although it is not a MUST-BE. ".update" provides a good feature that
user space programs
can update an implementation on the flight.
On Mon, Jun 17, 2024 at 11:16 AM Mark Brown <broonie@xxxxxxxxxx> wrote:
>
> Hi all,
>
> 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@xxxxxxxxxx>
> 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@xxxxxxxxxx>
> ---
> 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
>
