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Date:   Mon, 2 Oct 2023 16:48:01 +0200
From:   Benjamin Tissoires <bentiss@kernel.org>
To:     Justin Stitt <justinstitt@google.com>
Cc:     Jiri Kosina <jikos@kernel.org>,
        Benjamin Tissoires <benjamin.tissoires@redhat.com>,
        Shuah Khan <shuah@kernel.org>,
        Eduard Zingerman <eddyz87@gmail.com>,
        linux-input@vger.kernel.org, linux-kselftest@vger.kernel.org,
        linux-kernel@vger.kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH v2 0/3] selftests/hid: fix building for older kernels
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References: <20230908-kselftest-09-08-v2-0-0def978a4c1b@google.com>
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On Sep 26 2023, Justin Stitt wrote:
> Hey all,
> 
> Gentle ping on this patch. Looking to get this patch and [1] slated
> for 6.7 wherein we can start getting cleaner kselftests builds.
> 
> I do not think I am able to successfully run the hid/bpf selftests due
> to my kernel version being too low (and an inability to upgrade it as
> I'm on a corp rolling release). I'd appreciate some insight on how to
> get the tests running or if someone could actually build+run the tests
> with this patch applied.

I wanted to apply this series today, but it failed my own CI now with
the enums being already defined:
https://gitlab.freedesktop.org/bentiss/hid/-/jobs/49754306

I'll probably squash the following patch in 1/3, would you mind giving
it a test?

---
From 37feca6c0e84705ad65e621643206c287b63bb0a Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <bentiss@kernel.org>
Date: Mon, 2 Oct 2023 15:37:18 +0200
Subject: [PATCH] fix selftests/hid: ensure we can compile the tests on kernels
 pre-6.3

Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
---
 .../selftests/hid/progs/hid_bpf_helpers.h     | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
index ab3b18ba48c4..feed5a991e05 100644
--- a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
+++ b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h
@@ -5,16 +5,44 @@
 #ifndef __HID_BPF_HELPERS_H
 #define __HID_BPF_HELPERS_H
 
-/* "undefine" structs in vmlinux.h, because we "override" them below */
+/* "undefine" structs and enums in vmlinux.h, because we "override" them below */
 #define hid_bpf_ctx hid_bpf_ctx___not_used
 #define hid_report_type hid_report_type___not_used
 #define hid_class_request hid_class_request___not_used
 #define hid_bpf_attach_flags hid_bpf_attach_flags___not_used
+#define HID_INPUT_REPORT         HID_INPUT_REPORT___not_used
+#define HID_OUTPUT_REPORT        HID_OUTPUT_REPORT___not_used
+#define HID_FEATURE_REPORT       HID_FEATURE_REPORT___not_used
+#define HID_REPORT_TYPES         HID_REPORT_TYPES___not_used
+#define HID_REQ_GET_REPORT       HID_REQ_GET_REPORT___not_used
+#define HID_REQ_GET_IDLE         HID_REQ_GET_IDLE___not_used
+#define HID_REQ_GET_PROTOCOL     HID_REQ_GET_PROTOCOL___not_used
+#define HID_REQ_SET_REPORT       HID_REQ_SET_REPORT___not_used
+#define HID_REQ_SET_IDLE         HID_REQ_SET_IDLE___not_used
+#define HID_REQ_SET_PROTOCOL     HID_REQ_SET_PROTOCOL___not_used
+#define HID_BPF_FLAG_NONE        HID_BPF_FLAG_NONE___not_used
+#define HID_BPF_FLAG_INSERT_HEAD HID_BPF_FLAG_INSERT_HEAD·___not_used
+#define HID_BPF_FLAG_MAX         HID_BPF_FLAG_MAX___not_used
+
 #include "vmlinux.h"
+
 #undef hid_bpf_ctx
 #undef hid_report_type
 #undef hid_class_request
 #undef hid_bpf_attach_flags
+#undef HID_INPUT_REPORT
+#undef HID_OUTPUT_REPORT
+#undef HID_FEATURE_REPORT
+#undef HID_REPORT_TYPES
+#undef HID_REQ_GET_REPORT
+#undef HID_REQ_GET_IDLE
+#undef HID_REQ_GET_PROTOCOL
+#undef HID_REQ_SET_REPORT
+#undef HID_REQ_SET_IDLE
+#undef HID_REQ_SET_PROTOCOL
+#undef HID_BPF_FLAG_NONE
+#undef HID_BPF_FLAG_INSERT_HEAD
+#undef HID_BPF_FLAG_MAX
 
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
-- 
2.41.0
---

Cheers,
Benjamin

> 
> On Sat, Sep 9, 2023 at 7:22 AM Justin Stitt <justinstitt@google.com> wrote:
> >
> > Hi, I am sending this series on behalf of myself and Benjamin Tissoires. There
> > existed an initial n=3 patch series which was later expanded to n=4 and
> > is now back to n=3 with some fixes added in and rebased against
> > mainline.
> >
> > This patch series aims to ensure that the hid/bpf selftests can be built
> > without errors.
> >
> > Here's Benjamin's initial cover letter for context:
> > |  These fixes have been triggered by [0]:
> > |  basically, if you do not recompile the kernel first, and are
> > |  running on an old kernel, vmlinux.h doesn't have the required
> > |  symbols and the compilation fails.
> > |
> > |  The tests will fail if you run them on that very same machine,
> > |  of course, but the binary should compile.
> > |
> > |  And while I was sorting out why it was failing, I realized I
> > |  could do a couple of improvements on the Makefile.
> > |
> > |  [0] https://lore.kernel.org/linux-input/56ba8125-2c6f-a9c9-d498-0ca1c153dcb2@redhat.com/T/#t
> >
> > Changes from v1 -> v2:
> > - roll Justin's fix into patch 1/3
> > - add __attribute__((preserve_access_index)) (thanks Eduard)
> > - rebased onto mainline (2dde18cd1d8fac735875f2e4987f11817cc0bc2c)
> > - Link to v1: https://lore.kernel.org/all/20230825-wip-selftests-v1-0-c862769020a8@kernel.org/
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/1698
> > Link: https://github.com/ClangBuiltLinux/continuous-integration2/issues/61
> > ---
> > Benjamin Tissoires (3):
> >       selftests/hid: ensure we can compile the tests on kernels pre-6.3
> >       selftests/hid: do not manually call headers_install
> >       selftests/hid: force using our compiled libbpf headers
> >
> >  tools/testing/selftests/hid/Makefile               | 10 ++---
> >  tools/testing/selftests/hid/progs/hid.c            |  3 --
> >  .../testing/selftests/hid/progs/hid_bpf_helpers.h  | 49 ++++++++++++++++++++++
> >  3 files changed, 53 insertions(+), 9 deletions(-)
> > ---
> > base-commit: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c
> > change-id: 20230908-kselftest-09-08-56d7f4a8d5c4
> >
> > Best regards,
> > --
> > Justin Stitt <justinstitt@google.com>
> >
> 
> [1]: https://lore.kernel.org/all/20230912-kselftest-param_test-c-v1-1-80a6cffc7374@google.com/
> 
> Thanks
> Justin