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Rao" To: Steven Rostedt , Michael Ellerman 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 Message-Id: X-Mailer: git-send-email 2.25.4 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312, 18.0.737 definitions=2020-11-26_08:2020-11-26, 2020-11-26 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 impostorscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 clxscore=1015 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011260108 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 --- 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