The UAPI <asm/bpf_perf_event.h> header is required to define the type
alias bpf_user_pt_regs_t.  The generic version includes
<linux/ptrace.h> and defines it as an alias for struct pt_regs.

For these 3 architectures, struct pt_regs is not defined in the UAPI.
They need to override the generic version with an architecture-
specific definition of bpf_user_pt_regs_t.

References: https://autobuild.buildroot.org/results/bf2/bf21079facd21d684e8656e7ac44b4218a8fcb9d/build-end.log
Fixes: c895f6f703ad ("bpf: correct broken uapi for BPF_PROG_TYPE_PERF_EVENT program type")
Signed-off-by: Ben Hutchings <ben.hutchings@mind.be>
---
I understand that perf_events is not yet supported on nios2 and
openrisc, so this isn't obviously useful.  However, libbpf has generic
handling for BPF_PROG_TYPE_PERF_EVENT that includes
<linux/bpf_perf_event.h> and it now fails to build on openrisc.

I verified that:
- This fixes building libbpf with Buildroot for openrisc
- This makes "#include <linux/bpf_perf_event.h>" work on xtensa

I wasn't able to test nios2 at all.

Ben.

 arch/nios2/include/uapi/asm/bpf_perf_event.h    | 9 +++++++++
 arch/openrisc/include/uapi/asm/bpf_perf_event.h | 9 +++++++++
 arch/xtensa/include/uapi/asm/bpf_perf_event.h   | 9 +++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 arch/nios2/include/uapi/asm/bpf_perf_event.h
 create mode 100644 arch/openrisc/include/uapi/asm/bpf_perf_event.h
 create mode 100644 arch/xtensa/include/uapi/asm/bpf_perf_event.h

diff --git a/arch/nios2/include/uapi/asm/bpf_perf_event.h b/arch/nios2/include/uapi/asm/bpf_perf_event.h
new file mode 100644
index 000000000000..5e1e648aeec4
--- /dev/null
+++ b/arch/nios2/include/uapi/asm/bpf_perf_event.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef struct user_pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */
diff --git a/arch/openrisc/include/uapi/asm/bpf_perf_event.h b/arch/openrisc/include/uapi/asm/bpf_perf_event.h
new file mode 100644
index 000000000000..6cb1c2823288
--- /dev/null
+++ b/arch/openrisc/include/uapi/asm/bpf_perf_event.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef struct user_regs_struct bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */
diff --git a/arch/xtensa/include/uapi/asm/bpf_perf_event.h b/arch/xtensa/include/uapi/asm/bpf_perf_event.h
new file mode 100644
index 000000000000..5e1e648aeec4
--- /dev/null
+++ b/arch/xtensa/include/uapi/asm/bpf_perf_event.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef struct user_pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */
-- 
2.39.5