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powerpc/fprobe: fix updated fprobe for function-graph tracer

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Since commit 4346ba1604 ("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 b5fa903b7f ("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 762abbc0d0 ("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().

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Aditya Bodkhe <aditya.b1@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250916044035.29033-2-adityab1@linux.ibm.com
This commit is contained in:
Hari Bathini 2025-09-16 10:10:35 +05:30 committed by Madhavan Srinivasan
parent d733f18a6d
commit 7cec88bfdd
2 changed files with 13 additions and 0 deletions
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1
arch/powerpc/Kconfig
View File

@ -243,6 +243,7 @@ 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_FUNCTION_ARG_ACCESS_API
select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1
select HAVE_FUNCTION_ERROR_INJECTION

12
arch/powerpc/include/asm/fprobe.h Normal file
View File

@ -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 */