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Thu, 08 Aug 2024 17:18:18 -0400 X-MC-Unique: -r30CwRLNoCB0RTJZ1w5hA-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F04FD1955F4A; Thu, 8 Aug 2024 21:18:15 +0000 (UTC) Received: from sullivan-work.redhat.com (unknown [10.2.17.32]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 6D44C300018D; Thu, 8 Aug 2024 21:18:11 +0000 (UTC) From: Ryan Sullivan To: live-patching@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: RE: [PATCH v2] powerpc/ftrace: restore caller's toc on ppc64 livepatch sibling call Date: Thu, 8 Aug 2024 17:17:40 -0400 Message-ID: <20240808211751.50746-1-rysulliv@redhat.com> In-Reply-To: <79fffe34-ce0b-4937-a85a-0ce566684887@csgroup.eu> References: <79fffe34-ce0b-4937-a85a-0ce566684887@csgroup.eu> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 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: pmladek@suse.com, joe.lawrence@redhat.com, jikos@kernel.org, christophe.leroy@csgroup.eu, rysulliv@redhat.com, npiggin@gmail.com, naveen.n.rao@linux.ibm.com, mbenes@suse.cz, jpoimboe@kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Restores caller's toc pointer to r2, on a sibling call this will uncorrupt the caller's toc pointer and otherwise will be redundant Signed-off-by: Ryan Sullivan --- arch/powerpc/kernel/trace/ftrace_entry.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kernel/trace/ftrace_entry.S b/arch/powerpc/kernel/trace/ftrace_entry.S index 76dbe9fd2c0f..4dfbe6076ad1 100644 --- a/arch/powerpc/kernel/trace/ftrace_entry.S +++ b/arch/powerpc/kernel/trace/ftrace_entry.S @@ -244,6 +244,9 @@ livepatch_handler: mtlr r12 ld r2, -24(r11) + /* Restore toc to caller's stack in case of sibling call */ + std r2, 24(r1) + /* Pop livepatch stack frame */ ld r12, PACA_THREAD_INFO(r13) subi r11, r11, 24 -- 2.44.0