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Rao" CC: Christophe Leroy , "linux-kernel@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "live-patching@vger.kernel.org" Subject: [PATCH v2 06/13] powerpc/ftrace: Simplify PPC32's return_to_handler() Thread-Topic: [PATCH v2 06/13] powerpc/ftrace: Simplify PPC32's return_to_handler() Thread-Index: AQHX9b/+LnaEbwqa30+7uq9KTtCL+g== Date: Mon, 20 Dec 2021 16:38:19 +0000 Message-ID: References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=csgroup.eu; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: e3facd83-e662-447d-6364-08d9c3d72164 x-ms-traffictypediagnostic: MR1P264MB2161:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:2043; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MRZP264MB2988.FRAP264.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(4636009)(366004)(5660300002)(6506007)(508600001)(83380400001)(86362001)(2616005)(8676002)(71200400001)(4326008)(6512007)(36756003)(54906003)(122000001)(8936002)(4744005)(110136005)(44832011)(26005)(316002)(6486002)(186003)(64756008)(66946007)(66446008)(2906002)(38100700002)(38070700005)(7416002)(76116006)(66556008)(66476007)(91956017);DIR:OUT;SFP:1101; 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charset="iso-8859-1" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: csgroup.eu X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MRZP264MB2988.FRAP264.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: e3facd83-e662-447d-6364-08d9c3d72164 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Dec 2021 16:38:19.4768 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9914def7-b676-4fda-8815-5d49fb3b45c8 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 3qCmux5ANKwm6Q8nqdGdfLYjEgLcmBKwpP+puQt5ckH1nzVRPTSUJPMgqyZQVNcVqLTI5uN3OC7Ea5zAmraKWotpjKmcld7XV6WG1Aa37rs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MR1P264MB2161 Precedence: bulk List-ID: X-Mailing-List: live-patching@vger.kernel.org return_to_handler() was copied from PPC64. For PPC32 it just needs to save r3 and r4, and doesn't require any nop after the bl. Signed-off-by: Christophe Leroy --- arch/powerpc/kernel/trace/ftrace_32.S | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/kernel/trace/ftrace_32.S b/arch/powerpc/kernel/trace/ftrace_32.S index 7e2fd729116b..95ffea2bdc29 100644 --- a/arch/powerpc/kernel/trace/ftrace_32.S +++ b/arch/powerpc/kernel/trace/ftrace_32.S @@ -162,22 +162,18 @@ _GLOBAL(ftrace_graph_caller) _GLOBAL(return_to_handler) /* need to save return values */ - stwu r1, -32(r1) - stw r3, 20(r1) - stw r4, 16(r1) - stw r31, 12(r1) - mr r31, r1 + stwu r1, -16(r1) + stw r3, 8(r1) + stw r4, 12(r1) bl ftrace_return_to_handler - nop /* return value has real return address */ mtlr r3 - lwz r3, 20(r1) - lwz r4, 16(r1) - lwz r31,12(r1) - lwz r1, 0(r1) + lwz r3, 8(r1) + lwz r4, 12(r1) + addi r1, r1, 16 /* Jump back to real return address */ blr -- 2.33.1