[PATCH] bpf: btf: include linux/types.h for u32

[PATCH] bpf: btf: include linux/types.h for u32

[Dmitrii Bundin]

Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
the header linux/types.h. Including it directly on the top level helps
to avoid potential problems if linux/types.h hasn't been included
before.

Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
---
 include/linux/btf_ids.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
index e24aabfe8ecc..c0e3e1426a82 100644
--- a/include/linux/btf_ids.h
+++ b/include/linux/btf_ids.h
@@ -3,6 +3,8 @@
 #ifndef _LINUX_BTF_IDS_H
 #define _LINUX_BTF_IDS_H
 
+#include <linux/types.h> /* for u32 */
+
 struct btf_id_set {
 	u32 cnt;
 	u32 ids[];
-- 
2.34.1

Re: [PATCH] bpf: btf: include linux/types.h for u32

[Jiri Olsa]

please use '[PATCH bpf-next]' in subject

On Sun, Apr 14, 2024 at 07:51:24AM +0300, Dmitrii Bundin wrote:
> Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
> the header linux/types.h. Including it directly on the top level helps
> to avoid potential problems if linux/types.h hasn't been included
> before.
> 
> Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
> ---
>  include/linux/btf_ids.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
> index e24aabfe8ecc..c0e3e1426a82 100644
> --- a/include/linux/btf_ids.h
> +++ b/include/linux/btf_ids.h
> @@ -3,6 +3,8 @@
>  #ifndef _LINUX_BTF_IDS_H
>  #define _LINUX_BTF_IDS_H
>  
> +#include <linux/types.h> /* for u32 */

lgtm, did it actualy cause problem anywhere?

there's also tools/include/linux/btf_ids.h

jirka

> +
>  struct btf_id_set {
>  	u32 cnt;
>  	u32 ids[];
> -- 
> 2.34.1
> 

[PATCH bpf-next v2] bpf: btf: include linux/types.h for u32

[Dmitrii Bundin]

Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
the header linux/types.h. Including it directly on the top level helps
to avoid potential problems if linux/types.h hasn't been included
before.

Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
---

Changes in v2: Add bpf-next to the subject

 include/linux/btf_ids.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
index e24aabfe8ecc..c0e3e1426a82 100644
--- a/include/linux/btf_ids.h
+++ b/include/linux/btf_ids.h
@@ -3,6 +3,8 @@
 #ifndef _LINUX_BTF_IDS_H
 #define _LINUX_BTF_IDS_H
 
+#include <linux/types.h> /* for u32 */
+
 struct btf_id_set {
 	u32 cnt;
 	u32 ids[];
-- 
2.34.1

Re: [PATCH bpf-next v2] bpf: btf: include linux/types.h for u32

[Jiri Olsa]

On Tue, Apr 16, 2024 at 08:15:27AM +0300, Dmitrii Bundin wrote:
> Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
> the header linux/types.h. Including it directly on the top level helps
> to avoid potential problems if linux/types.h hasn't been included
> before.
> 
> Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>

Acked-by: Jiri Olsa <jolsa@kernel.org>

jirka

> ---
> 
> Changes in v2: Add bpf-next to the subject
> 
>  include/linux/btf_ids.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
> index e24aabfe8ecc..c0e3e1426a82 100644
> --- a/include/linux/btf_ids.h
> +++ b/include/linux/btf_ids.h
> @@ -3,6 +3,8 @@
>  #ifndef _LINUX_BTF_IDS_H
>  #define _LINUX_BTF_IDS_H
>  
> +#include <linux/types.h> /* for u32 */
> +
>  struct btf_id_set {
>  	u32 cnt;
>  	u32 ids[];
> -- 
> 2.34.1
> 

Re: [PATCH] bpf: btf: include linux/types.h for u32

[Dmitrii Bundin]

On Mon, Apr 15, 2024 at 3:11 PM Jiri Olsa <olsajiri@gmail.com> wrote:
> lgtm, did it actualy cause problem anywhere?
>
> there's also tools/include/linux/btf_ids.h

It caused the problems exactly in the file
tools/include/linux/btf_ids.h and was reported in
https://bugzilla.kernel.org/show_bug.cgi?id=218647
The patch including linux/types.h in tools/include/linux/btf_ids.h is
already there https://lore.kernel.org/all/20240328110103.28734-1-ncopa@alpinelinux.org/
I also faced the same compile-error of the form

    error: unknown type name 'u32'
                              u32 cnt;
                              ^~~
when compiling the bpf tool with glibc 2.28.

I think it might be reasonable to add the inclusion in
include/linux/btf_ids.h as well to prevent build problems like this.

Re: [PATCH] bpf: btf: include linux/types.h for u32

[Jiri Olsa]

On Tue, Apr 16, 2024 at 08:27:21AM +0300, Dmitrii Bundin wrote:
> On Mon, Apr 15, 2024 at 3:11 PM Jiri Olsa <olsajiri@gmail.com> wrote:
> > lgtm, did it actualy cause problem anywhere?
> >
> > there's also tools/include/linux/btf_ids.h
> 
> It caused the problems exactly in the file
> tools/include/linux/btf_ids.h and was reported in
> https://bugzilla.kernel.org/show_bug.cgi?id=218647
> The patch including linux/types.h in tools/include/linux/btf_ids.h is
> already there https://lore.kernel.org/all/20240328110103.28734-1-ncopa@alpinelinux.org/
> I also faced the same compile-error of the form
> 
>     error: unknown type name 'u32'
>                               u32 cnt;
>                               ^~~
> when compiling the bpf tool with glibc 2.28.
> 
> I think it might be reasonable to add the inclusion in
> include/linux/btf_ids.h as well to prevent build problems like this.

ok, it's in the bpf/master already

jirka

Re: [PATCH] bpf: btf: include linux/types.h for u32

[Daniel Borkmann]

On 4/16/24 9:28 AM, Jiri Olsa wrote:
> On Tue, Apr 16, 2024 at 08:27:21AM +0300, Dmitrii Bundin wrote:
>> On Mon, Apr 15, 2024 at 3:11 PM Jiri Olsa <olsajiri@gmail.com> wrote:
>>> lgtm, did it actualy cause problem anywhere?
>>>
>>> there's also tools/include/linux/btf_ids.h
>>
>> It caused the problems exactly in the file
>> tools/include/linux/btf_ids.h and was reported in
>> https://bugzilla.kernel.org/show_bug.cgi?id=218647
>> The patch including linux/types.h in tools/include/linux/btf_ids.h is
>> already there https://lore.kernel.org/all/20240328110103.28734-1-ncopa@alpinelinux.org/
>> I also faced the same compile-error of the form
>>
>>      error: unknown type name 'u32'
>>                                u32 cnt;
>>                                ^~~
>> when compiling the bpf tool with glibc 2.28.
>>
>> I think it might be reasonable to add the inclusion in
>> include/linux/btf_ids.h as well to prevent build problems like this.
> 
> ok, it's in the bpf/master already
Please add the error description as motivation aka "why" into the commit
description, otherwise it's not really obvious looking at it at a later
point in time why the include was needed.

Thanks,
Daniel

Re: [PATCH] bpf: btf: include linux/types.h for u32

[Dmitrii Bundin]

On Tue, Apr 16, 2024 at 5:47 PM Daniel Borkmann <daniel@iogearbox.net> wrote:
> Please add the error description as motivation aka "why" into the commit
> description, otherwise it's not really obvious looking at it at a later
> point in time why the include was needed.

Doesn't the comment /* for u32 */ following the include explain the
purpose? I thought the include was actually missing since relying on
indirect declaration of u32 is relatively fragile.

Re: [PATCH] bpf: btf: include linux/types.h for u32

[Jiri Olsa]

On Wed, Apr 17, 2024 at 09:26:03AM +0300, Dmitrii Bundin wrote:
> On Tue, Apr 16, 2024 at 5:47 PM Daniel Borkmann <daniel@iogearbox.net> wrote:
> > Please add the error description as motivation aka "why" into the commit
> > description, otherwise it's not really obvious looking at it at a later
> > point in time why the include was needed.
> 
> Doesn't the comment /* for u32 */ following the include explain the
> purpose? I thought the include was actually missing since relying on
> indirect declaration of u32 is relatively fragile.

I think you can add similar descirption as for the already merged tool
change in bpf/master, and also include the Fixes/stable tags

commit 62248b22d01e96a4d669cde0d7005bd51ebf9e76
Author: Natanael Copa <ncopa@alpinelinux.org>
Date:   Thu Mar 28 11:59:13 2024 +0100

    tools/resolve_btfids: fix build with musl libc
    
    Include the header that defines u32.
    This fixes build of 6.6.23 and 6.1.83 kernels for Alpine Linux, which
    uses musl libc. I assume that GNU libc indirecly pulls in linux/types.h.
    
    Fixes: 9707ac4fe2f5 ("tools/resolve_btfids: Refactor set sorting with types from btf_ids.h")
    Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218647
    Cc: stable@vger.kernel.org
    Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
    Tested-by: Greg Thelen <gthelen@google.com>
    Link: https://lore.kernel.org/r/20240328110103.28734-1-ncopa@alpinelinux.org
    Signed-off-by: Alexei Starovoitov <ast@kernel.org>


jirka

[PATCH bpf-next v3] bpf: btf: include linux/types.h for u32

[Dmitrii Bundin]

Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
the header linux/types.h. Including it directly on the top level helps
to avoid potential problems if linux/types.h hasn't been included
before.

The main motiviation to introduce this it is to avoid similar problems that
was shown up in the bpf tool where GNU libc indirectly pulls
linux/types.h causing compile error of the form:

   error: unknown type name 'u32'
                             u32 cnt;
                             ^~~

The bpf tool compile error was fixed at 62248b22d01e96a4d669cde0d7005bd51ebf9e76

Fixes: 9707ac4fe2f5 ("tools/resolve_btfids: Refactor set sorting with types from btf_ids.h")

Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
---

Changes in v2: Add bpf-next to the subject
Changes in v3: Add Fixes tag and bpf tool commit reference

 include/linux/btf_ids.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
index e24aabfe8ecc..c0e3e1426a82 100644
--- a/include/linux/btf_ids.h
+++ b/include/linux/btf_ids.h
@@ -3,6 +3,8 @@
 #ifndef _LINUX_BTF_IDS_H
 #define _LINUX_BTF_IDS_H
 
+#include <linux/types.h> /* for u32 */
+
 struct btf_id_set {
 	u32 cnt;
 	u32 ids[];
-- 
2.34.1

Re: [PATCH bpf-next v3] bpf: btf: include linux/types.h for u32

[Daniel Borkmann]

On 4/20/24 6:24 AM, Dmitrii Bundin wrote:
> Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
> the header linux/types.h. Including it directly on the top level helps
> to avoid potential problems if linux/types.h hasn't been included
> before.
> 
> The main motiviation to introduce this it is to avoid similar problems that

nit: spelling

> was shown up in the bpf tool where GNU libc indirectly pulls
> linux/types.h causing compile error of the form:
> 
>     error: unknown type name 'u32'
>                               u32 cnt;
>                               ^~~
> 
> The bpf tool compile error was fixed at 62248b22d01e96a4d669cde0d7005bd51ebf9e76
> 
> Fixes: 9707ac4fe2f5 ("tools/resolve_btfids: Refactor set sorting with types from btf_ids.h")
> 
> Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
> ---
> 
> Changes in v2: Add bpf-next to the subject
> Changes in v3: Add Fixes tag and bpf tool commit reference
> 
>   include/linux/btf_ids.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
> index e24aabfe8ecc..c0e3e1426a82 100644
> --- a/include/linux/btf_ids.h
> +++ b/include/linux/btf_ids.h
> @@ -3,6 +3,8 @@
>   #ifndef _LINUX_BTF_IDS_H
>   #define _LINUX_BTF_IDS_H
>   
> +#include <linux/types.h> /* for u32 */
> +
>   struct btf_id_set {
>   	u32 cnt;
>   	u32 ids[];
> 

Lgtm, not sure if its worth it but also doesn't hurt and aligns the header
from tooling a bit closer to the kernel one. Just to clarify, this does not
fix a concrete issue today, so small 'cleanup' rather than 'fix'.

Thanks,
Daniel

Re: [PATCH bpf-next v3] bpf: btf: include linux/types.h for u32

[Andrii Nakryiko]

On Fri, Apr 26, 2024 at 8:54 AM Daniel Borkmann <daniel@iogearbox.net> wrote:
>
> On 4/20/24 6:24 AM, Dmitrii Bundin wrote:
> > Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
> > the header linux/types.h. Including it directly on the top level helps
> > to avoid potential problems if linux/types.h hasn't been included
> > before.
> >
> > The main motiviation to introduce this it is to avoid similar problems that
>
> nit: spelling
>
> > was shown up in the bpf tool where GNU libc indirectly pulls
> > linux/types.h causing compile error of the form:
> >
> >     error: unknown type name 'u32'
> >                               u32 cnt;
> >                               ^~~
> >
> > The bpf tool compile error was fixed at 62248b22d01e96a4d669cde0d7005bd51ebf9e76
> >
> > Fixes: 9707ac4fe2f5 ("tools/resolve_btfids: Refactor set sorting with types from btf_ids.h")
> >
> > Signed-off-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
> > ---
> >
> > Changes in v2: Add bpf-next to the subject
> > Changes in v3: Add Fixes tag and bpf tool commit reference
> >
> >   include/linux/btf_ids.h | 2 ++
> >   1 file changed, 2 insertions(+)
> >
> > diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
> > index e24aabfe8ecc..c0e3e1426a82 100644
> > --- a/include/linux/btf_ids.h
> > +++ b/include/linux/btf_ids.h
> > @@ -3,6 +3,8 @@
> >   #ifndef _LINUX_BTF_IDS_H
> >   #define _LINUX_BTF_IDS_H
> >
> > +#include <linux/types.h> /* for u32 */
> > +
> >   struct btf_id_set {
> >       u32 cnt;
> >       u32 ids[];
> >
>
> Lgtm, not sure if its worth it but also doesn't hurt and aligns the header
> from tooling a bit closer to the kernel one. Just to clarify, this does not
> fix a concrete issue today, so small 'cleanup' rather than 'fix'.
>

Adjusted commit message and pushed to bpf-next, thanks.

> Thanks,
> Daniel

Re: [PATCH bpf-next v3] bpf: btf: include linux/types.h for u32

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Sat, 20 Apr 2024 07:24:57 +0300 you wrote:
> Inclusion of the header linux/btf_ids.h relies on indirect inclusion of
> the header linux/types.h. Including it directly on the top level helps
> to avoid potential problems if linux/types.h hasn't been included
> before.
> 
> The main motiviation to introduce this it is to avoid similar problems that
> was shown up in the bpf tool where GNU libc indirectly pulls
> linux/types.h causing compile error of the form:
> 
> [...]

Here is the summary with links:
  - [bpf-next,v3] bpf: btf: include linux/types.h for u32
    https://git.kernel.org/bpf/bpf-next/c/cfd3bfe9507b

You are awesome, thank you!
-- 
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