linux-kernel - [PATCH 2/2] powerpc/fprobe: fix updated fprobe for function-graph tracer

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Message-Id: <20250528134820.74121-2-adityab1@linux.ibm.com>
Date: Wed, 28 May 2025 19:18:20 +0530
From: Aditya Bodkhe <adityab1@...ux.ibm.com>
To: linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        maddy@...ux.ibm.com, mpe@...erman.id.au, npiggin@...il.com,
        christophe.leroy@...roup.eu, rostedt@...dmis.org, mhiramat@...nel.org,
        mark.rutland@....com, Hari Bathini <hbathini@...ux.ibm.com>,
        Aditya Bodkhe <aditya.b1@...ux.ibm.com>
Subject: [PATCH 2/2] powerpc/fprobe: fix updated fprobe for function-graph tracer

From: Hari Bathini <hbathini@...ux.ibm.com>

Since commit 4346ba160409 ("fprobe: Rewrite fprobe on function-graph
tracer"), FPROBE depends on HAVE_FUNCTION_GRAPH_FREGS. With previous
patch adding HAVE_FUNCTION_GRAPH_FREGS for powerpc, FPROBE can be
enabled on powerpc. But with the commit b5fa903b7f7c ("fprobe: Add
fprobe_header encoding feature"), asm/fprobe.h header is needed to
define arch dependent encode/decode macros. The fprobe header MSB
pattern on powerpc is not 0xf. So, define FPROBE_HEADER_MSB_PATTERN
expected on powerpc.

Also, commit 762abbc0d09f ("fprobe: Use ftrace_regs in fprobe exit
handler") introduced HAVE_FTRACE_REGS_HAVING_PT_REGS for archs that
have pt_regs in ftrace_regs. Advertise that on powerpc to reuse
common definitions like ftrace_partial_regs().

Signed-off-by: Hari Bathini <hbathini@...ux.ibm.com>
Signed-off-by: Aditya Bodkhe <aditya.b1@...ux.ibm.com>
---
 arch/powerpc/Kconfig              |  1 +
 arch/powerpc/include/asm/fprobe.h | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 arch/powerpc/include/asm/fprobe.h

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9163521bc4b9..2203e4fb64c1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -246,6 +246,7 @@ config PPC
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS
 	select HAVE_GUP_FAST
 	select HAVE_FTRACE_GRAPH_FUNC
+	select HAVE_FTRACE_REGS_HAVING_PT_REGS
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_FUNCTION_ARG_ACCESS_API
 	select HAVE_FUNCTION_DESCRIPTORS	if PPC64_ELF_ABI_V1
diff --git a/arch/powerpc/include/asm/fprobe.h b/arch/powerpc/include/asm/fprobe.h
new file mode 100644
index 000000000000..d64bc28fb3d3
--- /dev/null
+++ b/arch/powerpc/include/asm/fprobe.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_PPC_FPROBE_H
+#define _ASM_PPC_FPROBE_H
+
+#include <asm-generic/fprobe.h>
+
+#ifdef CONFIG_64BIT
+#undef FPROBE_HEADER_MSB_PATTERN
+#define FPROBE_HEADER_MSB_PATTERN	(PAGE_OFFSET & ~FPROBE_HEADER_MSB_MASK)
+#endif
+
+#endif /* _ASM_PPC_FPROBE_H */
-- 
2.43.5