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Tue, 28 Jul 2026 00:26:29 -0500 From: K Prateek Nayak To: Arnd Bergmann , Thomas Gleixner , "Ingo Molnar" , Peter Zijlstra , "Sebastian Andrzej Siewior" , Charlie Jenkins , Borislav Petkov , Dave Hansen , CC: Darren Hart , Davidlohr Bueso , =?UTF-8?q?Andr=C3=A9=20Almeida?= , , , , , , K Prateek Nayak , "H. Peter Anvin" , "Sean Christopherson" , Thomas Huth Subject: [PATCH v6 1/8] x86/runtime-const: Introduce runtime_const_mask_32() Date: Tue, 28 Jul 2026 05:25:33 +0000 Message-ID: <20260728052540.4728-2-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260728052540.4728-1-kprateek.nayak@amd.com> References: <20260728052540.4728-1-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: MN1PEPF0000F0E2:EE_|SA3PR12MB8810:EE_ X-MS-Office365-Filtering-Correlation-Id: 3284c15e-85a8-4823-432e-08deec68d49c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|1800799024|36860700016|376014|23010399003|13003099007|11063799006|56012099006|10067099003|18002099003|22082099003; X-Microsoft-Antispam-Message-Info: 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 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)(82310400026)(7416014)(1800799024)(36860700016)(376014)(23010399003)(13003099007)(11063799006)(56012099006)(10067099003)(18002099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: nE16L/EIRSADkTc6ASmKmTgRK9ZAj6cEtTvXzZJ1BPk0cflNRqPvxSNneGIf7uV1LRqGfSpeactSHkVPFM80xuqUTS1ohdPD0x4ZUXVKeBwspmU4C0+5emwsheerxf0NDkPIMLdP3UbOmTqimWS2YQI7I4bH1y8l/UVgJQx4MsWyfb/usYBla6r560AKOoC/ifnyUkmlfTgSNJq9SUyPVybsFRRxKj0876WSpOgP+mmbiswGyj49kJvIivZXlGVT1vtmYktgvKeiSpUYwRfeMyPMGzK11L1sWZCMkWCkBeDZYdzr9JvZSPQkGzCNL6q/cDqAPga81n6rTeESYWXEui9CJTn6REOPepYLilS+aXooWjyvgwKK2Cpg5ntK7/hOjpenXgQj9VMnmUTWkId7yhJLtnqZ4KkNufVtki3MMGWHCFL2vHfw0JACSmDOCw2O X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jul 2026 05:26:52.0595 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3284c15e-85a8-4823-432e-08deec68d49c 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: MN1PEPF0000F0E2.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB8810 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260727_222659_286763_802F0DF0 X-CRM114-Status: GOOD ( 11.07 ) 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 Signed-off-by: Peter Zijlstra Signed-off-by: K Prateek Nayak --- changelog v5..v6: o Picked up Peter's S-o-b from his tree. o No changes to the diff since v4. --- 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 4cd94fdcb45e..b13f7036c1c9 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