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Thu, 30 Apr 2026 04:48:15 -0500 From: K Prateek Nayak To: Thomas Gleixner , Ingo Molnar , "Peter Zijlstra" , Sebastian Andrzej Siewior , Borislav Petkov , Dave Hansen , CC: Darren Hart , Davidlohr Bueso , =?UTF-8?q?Andr=C3=A9=20Almeida?= , , , , , , K Prateek Nayak , "H. Peter Anvin" , Thomas Huth , Sean Christopherson Subject: [PATCH v4 1/8] x86/runtime-const: Introduce runtime_const_mask_32() Date: Thu, 30 Apr 2026 09:47:23 +0000 Message-ID: <20260430094730.31624-2-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260430094730.31624-1-kprateek.nayak@amd.com> References: <20260430094730.31624-1-kprateek.nayak@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00001508:EE_|BY5PR12MB4164:EE_ X-MS-Office365-Filtering-Correlation-Id: bb15d2f0-59d5-448e-fdb8-08dea69d9d6e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|7416014|13003099007|56012099003|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: HrI+Qz/UaBQw/cIMYpjOzt9QXh79Pk66Rbmk/Sd2HnnTaf7+8emiyYqhZBEXmeqmmRclHpUFYtojBgJmyoafwAYNCuhhhBSeR5YtAVAZZYc8EE1eR3ViBUx/vld0adY5rdpjLTCPB79+0xAsuZcuHsMb5co4syRf1+YfqBmm+GgFEwCrSKb2DcniJTLzBDH2JxbigXHXRF/C65gO9G7pGZRgcqB7xtZ8pvp5dlbhNmm6M2u5sDL68DGj78W3+MZXRK0soG2yivl8EE9Z1wdadIEo+gtFPKwhpjbj5cmhlb3hm2+cY2cYGz655sQ9i/XMl2B3zqT7ayP2iHPwrV6fUTYxfDDBOIMaY784pZ1DcFf1oibzRwljvcSH1k/B1Lcr7U+7Ax60ydf9vWiZrOeM910MxY5au/ytAb+aVPHZazsXg6q0xWukCEkGEJOYMvH7rBZXAOMVnx9P3v57C9nSRZ7F4mYUFN6ADvYVJZpj/lgCFjNdT6UAi51gdIgj+bpbdm/zXeVkbj1jNFRxbUag+izYHAx1CfoqDLEAYAfJ4G80A6WArN48QA7ymffFJAw0jlSlFjOkJUYRNAj8aMjdsA0HJBXXC1tucdcON7n07zMYOMLpt7+Pu969CVBFWjdqTEO0Yp5BObmAWdq717IrILMdWz1it+FNir3ZDcHBhEGhjANwgsH878/MHNfsMIkv6ixhUpxuQSlcR4deirmwdNoBEBZ5E7Tp5dFWOd+sVIw= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(82310400026)(36860700016)(376014)(7416014)(13003099007)(56012099003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: zG1pbYHHtqqPtsI6A0/Ib3m0GKzLF1IKSUloTvflUjZJAT79xytmFQBsseNtLOxfPpVICT0Hkfqc4z3aAJJJOa17jiP/LpEn3SYPC30dYrImo3ctdy0An4tHPPGcaqkT2kro9qU0VCIiTmYlN7l1+/Js2XQxLWiJSHpM3IpDz4mpYUg8IaHfh80WGiM+wegraydX2IP6pr8qrAr/6rLk4MvRMBABhFPY7AKG3eYHndvJ6DFgWkQ1t9ydXmsQtwcFG9JBVyhjbmripLR0/8nQ+IRcXLjhWvr5jUoWhcrJIzQ0WIvl3/JEfnGkJm+IgU3C/EyIhoKHszEq9wneQQEx5Q9wui7fYcFjqKY6SW573qo/JPq+xWX4aG+zjCzXShK331vtOCzTOuTm5hYSWXTsKjR+cgez+Y+SlJeoSW4IBx+deSmzsXlNQobCc87IvUHK X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Apr 2026 09:48:21.3886 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bb15d2f0-59d5-448e-fdb8-08dea69d9d6e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00001508.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4164 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260430_024829_645775_BAD59170 X-CRM114-Status: GOOD ( 10.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Peter Zijlstra Futex hash computation requires a mask operation with read-only after init data that will be converted to a runtime constant in the subsequent commit. Introduce runtime_const_mask_32 to further optimize the mask operation in the futex hash computation hot path. [ prateek: Broke off the x86 chunk, commit message. ] Link: https://patch.msgid.link/20260227161841.GH606826@noisy.programming.kicks-ass.net Not-yet-signed-off-by: Peter Zijlstra Signed-off-by: K Prateek Nayak --- changelog v3..v4: o No changes. --- arch/x86/include/asm/runtime-const.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/include/asm/runtime-const.h b/arch/x86/include/asm/runtime-const.h index 4cd94fdcb45e2..b13f7036c1c9b 100644 --- a/arch/x86/include/asm/runtime-const.h +++ b/arch/x86/include/asm/runtime-const.h @@ -41,6 +41,15 @@ :"+r" (__ret)); \ __ret; }) +#define runtime_const_mask_32(val, sym) ({ \ + typeof(0u+(val)) __ret = (val); \ + asm_inline("and $0x12345678, %k0\n1:\n" \ + ".pushsection runtime_mask_" #sym ",\"a\"\n\t"\ + ".long 1b - 4 - .\n" \ + ".popsection" \ + : "+r" (__ret)); \ + __ret; }) + #define runtime_const_init(type, sym) do { \ extern s32 __start_runtime_##type##_##sym[]; \ extern s32 __stop_runtime_##type##_##sym[]; \ @@ -65,6 +74,11 @@ static inline void __runtime_fixup_shift(void *where, unsigned long val) *(unsigned char *)where = val; } +static inline void __runtime_fixup_mask(void *where, unsigned long val) +{ + *(unsigned int *)where = val; +} + static inline void runtime_const_fixup(void (*fn)(void *, unsigned long), unsigned long val, s32 *start, s32 *end) { -- 2.34.1