From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: <linux-kernel@vger.kernel.org>, <linuxppc-dev@lists.ozlabs.org>
Subject: [RFC PATCH 12/14] powerpc/ftrace: Drop saving LR to stack save area for -mprofile-kernel
Date: Thu, 26 Nov 2020 23:38:49 +0530 [thread overview]
Message-ID: <b40cb303a22f75b85ec0c8d45160e983baff9299.1606412433.git.naveen.n.rao@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1606412433.git.naveen.n.rao@linux.vnet.ibm.com>
In -mprofile-kernel variant of ftrace_graph_caller(), we save the
optionally-updated LR address into the stack save area at the end. This
is likely an offshoot of the initial -mprofile-kernel implementation in
gcc emitting the same as part of the -mprofile-kernel instruction
sequence. However, this is not required. Drop it.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/powerpc/kernel/trace/ftrace_64_mprofile.S b/arch/powerpc/kernel/trace/ftrace_64_mprofile.S
index bbe871b47ade58..c5602e9b07faa3 100644
--- a/arch/powerpc/kernel/trace/ftrace_64_mprofile.S
+++ b/arch/powerpc/kernel/trace/ftrace_64_mprofile.S
@@ -310,7 +310,5 @@ _GLOBAL(ftrace_graph_caller)
ld r2, 24(r1)
addi r1, r1, SWITCH_FRAME_SIZE
- mflr r0
- std r0, LRSAVE(r1)
bctr
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
--
2.25.4
next prev parent reply other threads:[~2020-11-26 18:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 18:08 [RFC PATCH 00/14] powerpc64: Add support for ftrace direct calls Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 01/14] ftrace: Fix updating FTRACE_FL_TRAMP Naveen N. Rao
2020-12-01 2:23 ` Steven Rostedt
2020-12-01 13:46 ` Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 02/14] ftrace: Fix DYNAMIC_FTRACE_WITH_DIRECT_CALLS dependency Naveen N. Rao
2020-12-01 2:36 ` Steven Rostedt
2020-11-26 18:08 ` [RFC PATCH 03/14] ftrace: Fix cleanup in error path of register_ftrace_direct() Naveen N. Rao
2020-12-01 2:36 ` Steven Rostedt
2020-11-26 18:08 ` [RFC PATCH 04/14] ftrace: Remove ftrace_find_direct_func() Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 05/14] ftrace: Add architectural helpers for [un]register_ftrace_direct() Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 06/14] powerpc: Add support for CONFIG_HAVE_FUNCTION_ARG_ACCESS_API Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 07/14] powerpc/ftrace: Remove dead code Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 08/14] powerpc/ftrace: Use FTRACE_REGS_ADDR to identify the correct ftrace trampoline Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 09/14] powerpc/ftrace: Use a hash table for tracking ftrace stubs Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 10/14] powerpc/ftrace: Drop assumptions about ftrace trampoline target Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 11/14] powerpc/ftrace: Use GPR save/restore macros in ftrace_graph_caller() Naveen N. Rao
2020-11-26 18:08 ` Naveen N. Rao [this message]
2020-11-26 18:08 ` [RFC PATCH 13/14] powerpc/ftrace: Add support for register_ftrace_direct() for MPROFILE_KERNEL Naveen N. Rao
2020-11-26 18:08 ` [RFC PATCH 14/14] samples/ftrace: Add powerpc support for ftrace direct samples Naveen N. Rao
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