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From: Roger Pau Monne To: xen-devel@lists.xenproject.org Cc: Bertrand Marquis , Roger Pau Monne , Andrew Cooper , Anthony PERARD , Michal Orzel , Jan Beulich , Julien Grall , Stefano Stabellini Subject: [PATCH] xen: always consider '/' as a division in assembly Date: Tue, 10 Feb 2026 16:11:10 +0100 Message-ID: <20260210151110.26770-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.51.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MR1P264CA0108.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501:50::7) To CH7PR03MB7860.namprd03.prod.outlook.com (2603:10b6:610:24e::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH7PR03MB7860:EE_|CH7PR03MB7955:EE_ X-MS-Office365-Filtering-Correlation-Id: 693dee01-a3f2-400c-1640-08de68b6a730 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?d3FXQkVTMy9wRUs2MkVvazkxcUtKUEtuT2ZPNDBqRW1IellRaWFseWtHbU9T?= =?utf-8?B?WFRFS2NwWW9mbWh1eWxrZzlZWVNnVERKSCtXVUpWK1JEYUhqS0hMNGtkUTlO?= =?utf-8?B?anFEWklHeFRxc01oT1F6TVBiMXVRM0hoU2FVSWRoNWpLYUJOSFVnM0M0bEpq?= =?utf-8?B?dVcwczVhMGFxQTNSbEk1NGs1eUlPZjk0V1dsbEpETHU4MEhjakZJUFd3RHVI?= =?utf-8?B?eklFWjVBNjZvdmQzcEg0cUJLaHQza0RmQW5zWTh4bG94czhaZkFRS3FrODhN?= =?utf-8?B?RlFSeStrRE5DbU9wZmVKZFZMOUZsZmh1L25BS0xXTkpBamhWcWhQMzdBMnhV?= =?utf-8?B?bkFSYUYxLzRuK1kwcG1EQ0grMUVYU0orZGsvN1hHRmEranlWbzJoUlRab3hK?= =?utf-8?B?Q3pyUzZBUlJoQ3ZFVTFyZ1dScWNjRlh0TktIOTlvV2R6bjU3VnlNOGRodkJC?= =?utf-8?B?bkVGQ3JFWCt5U090ME1XWjNJdlRTMW5NU250RTJtb3B2YXkzYWdZOGRpRnBw?= =?utf-8?B?d1N3TUoyeWpzak1NdjR4U1E5NEpmVW53amk0bkVXNGJDZ1NSYXJlbkxxNzhK?= =?utf-8?B?bm9wUHFxandqbGJJSHp0OHB2L0lDSHE5dVArbjlpMkVlWTdYUW45aUlBQ1B3?= =?utf-8?B?R1c1UEJBL1Q0NE11Y2RBWDAyOTdocytlcWM3ajNwYnNmQkRpNElDay8vWWIv?= =?utf-8?B?bTBBVll4U0NMMnNVVWVUVWtSRHBjME1ZVTJOY2JJWDhhUzNVa3ZidHNsc2Js?= =?utf-8?B?UEo3a1NjRUVwb1M1L2VOQ09GaVYzWTZkNDI3cWJOYVJxWHJqQXJQRW1EaEtS?= =?utf-8?B?RXhxNGhkMkkramVSdkJRSGxPamtHenVHdUx4TXNFeCsxU2hjbnljLzg3V3Er?= =?utf-8?B?a1UyZTRKOEJkZUVNaHpLcmtuREgxTVltK2QyYzlTWStpSlpLN0NJeC8rOTBP?= =?utf-8?B?WEpmVSthaHBnMnRhQUtRa3RYdWs5ckJPaklISklMZ0xrLzBOZlEyVVY5c0p5?= =?utf-8?B?NFBsTVFZQUtFVVVDT2ZIQ0NMOC9UdWtpMDJsQy9SbTBZY0RlampiTzJ3VGd6?= =?utf-8?B?WWhqUW1mdUk4ZWxOdCswZVhkV1BxTW9jSWJLQ0JxWVFPUmdEeU9yZXdjRVow?= =?utf-8?B?UStqR1lBeFNmd2ZkRHJnUjlrK2xDc3A1YVBLV05zZHBzWU0xY3F6NE0zYkZT?= =?utf-8?B?QlhWdERjVDFvVlRRbHQ4bDdLdyt4TndDb3p6WjBIQ29CdVVsc1J1eE1LZE1m?= =?utf-8?B?NEJ0cXNWYXdJKzdXbG9EZGl5dWg5em5ocmRFK1k0OEhoTFFJVGp2ci9xbzJR?= =?utf-8?B?d0V3OHNhV2xHUkkrVGJiV3p1RmhOdjZodHJSVjA2RnVlSFg4TXZ1Y3RaWmVE?= =?utf-8?B?TTBjdVB1YWVBcTJLS2djdmtrYUhYMFd1bUM3d3lISnVGd1JOeFBjV1FPQURx?= =?utf-8?B?dkRpM1FoVWRVMHNJUkhnTGZwRmNCNzNqdHFoWTJSQVk2ZU51S2ZFU1Z4Tk4r?= =?utf-8?B?SnFKSTJEcHA5blIyQ0FFR2Naa0dSSlBrL2tWSnQ0YWJwSGp1bHRYMnVYTEQw?= =?utf-8?B?VU4yOWM2M1ZxbjZPc24ybmFYUjE4d2cwVGUrUUtuUyttbEgrM0VvRDR2MXNZ?= =?utf-8?B?N3Nhb3BHZTU0bi9mRS90YTQzWUwrdE8wVDdtYUY1NmZwZEU3QTdnZGhtcng1?= =?utf-8?B?MGgwWVlXZ1JEM0VvWlFYcWFNaC96ZW9DSndFVmxESlVRMlJvRmRBTmtZbHc0?= =?utf-8?B?S3IvZnpFQXZDZ3JPeFBiOG1sdW1DZHRhcDVGMThnMzVxMlBzQk16MW1YWG83?= =?utf-8?B?aW1HdGIvUXNSazFYN2pKbjB3SW1US2YyTlBtbXVhUTVnTzhCaHoxU1ZhQldU?= =?utf-8?B?ZkJxaldmTHR6TTVCUEp5TWcrWTRWYmdXeEpIdUdvK3hRTXZUQmlRaHBmeTV4?= =?utf-8?B?aFpNd3J2SHlmUDJHR1RONUZsK0VSUkRiVnNJNVdHcTY5SEtJemVRMkd5bHdR?= =?utf-8?B?TG1Db0s0SXpMRUZJNFRwS21Cdk5nYys2K2ZJRTdxUEE5VzdJcFhSVnMvcVJC?= =?utf-8?B?a3UxWEFVejlmYmx6VlRrWEhsdStDSm1xRnlGcFBUSW1QZW5XbVpWSEVxNnF5?= =?utf-8?Q?kjRQ=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH7PR03MB7860.namprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(366016)(1800799024);DIR:OUT;SFP:1101; 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This is incorrect with Xen's usage, which does use '/' in assembly files as a mathematical operator. The behavior of the assembler can be altered by passing the --divide option; unconditionally pass this option when available to force the expected behavior. Reported-by: Jan Beulich Signed-off-by: Roger Pau Monn=C3=A9 --- xen/Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/xen/Makefile b/xen/Makefile index 31352d4cd260..eee0262933a7 100644 --- a/xen/Makefile +++ b/xen/Makefile @@ -405,6 +405,11 @@ $(call cc-option-add,CFLAGS,CC,-Winit-self) CFLAGS +=3D -pipe -D__XEN__ -include $(srctree)/include/xen/config.h CFLAGS-$(CONFIG_DEBUG_INFO) +=3D -g =20 +# The GNU assembler will interpret '/' as a comment start marker instead o= f a +# divide on some platforms. Pass --divide when when available to signal '= /' is +# always used as an operator in assembly. +$(call cc-option-add,CFLAGS,CC,-Wa$$(comma)--divide) + ifneq ($(CONFIG_CC_IS_CLANG),y) # Clang doesn't understand this command line argument, and doesn't appear = to # have a suitable alternative. The resulting compiled binary does functio= n, --=20 2.51.0