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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ZQ2qGKAWcxNuKAb9PAc0EEhpUUojNWDKGJGR5LuyBT0dnh4KwiPeTl2/gVl5kntPJisCAryZjvKut9TLu1rSiprtmbtP3OBpSOk7uuY5bcPZhpo1MC6igcVzt+37Tc8eNNNCaQU+uVvCL0DfH2gL4dFZE9EDcnosR3bzlFg5C+CnRN8G6jMGQXBTqczd+lsr8iEzNlHSu5obUAEtLYnsatcek9y6dT1mQRdxt6BDYOPEdkmK5HWXNGZFikH2d37e3OwyANZyw+RA0Wm5vha/No93omYOP4w6AgOx/UWVc7seA/polAwzjdMdq9W/6DCkWrlAEeypimhvFWK1rxrZKTz5E1ynnyXjQLZ4PTij0w12ezFGR5NlW5j99oROlVWjzbfEf1QWsu77LKqasARkFfLfen0Q5O3CRBpHQ/jgKZYeXVUvhl4jWI5BGyr26uFP X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jul 2026 05:28:20.9215 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0606dd9a-dcc8-4386-c49c-08deec690994 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: MN1PEPF0000F0DF.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6071 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. GCC generates a: nilf %r1, to tackle arbitrary 32-bit masks and the same is implemented here. Immediate patching pattern for __runtime_fixup_mask() has been adopted from __runtime_fixup_ptr(). Acked-by: Heiko Carstens Signed-off-by: K Prateek Nayak --- changelog v5..v6: o No changes. --- arch/s390/include/asm/runtime-const.h | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/arch/s390/include/asm/runtime-const.h b/arch/s390/include/asm/runtime-const.h index 17878b1d048c..7b71156031ec 100644 --- a/arch/s390/include/asm/runtime-const.h +++ b/arch/s390/include/asm/runtime-const.h @@ -33,6 +33,20 @@ __ret; \ }) +#define runtime_const_mask_32(val, sym) \ +({ \ + unsigned int __ret = (val); \ + \ + asm_inline( \ + "0: nilf %[__ret],12\n" \ + ".pushsection runtime_mask_" #sym ",\"a\"\n" \ + ".long 0b - .\n" \ + ".popsection" \ + : [__ret] "+d" (__ret) \ + : : "cc"); \ + __ret; \ +}) + #define runtime_const_init(type, sym) do { \ extern s32 __start_runtime_##type##_##sym[]; \ extern s32 __stop_runtime_##type##_##sym[]; \ @@ -43,12 +57,12 @@ __stop_runtime_##type##_##sym); \ } while (0) -/* 32-bit immediate for iihf and iilf in bits in I2 field */ static inline void __runtime_fixup_32(u32 *p, unsigned int val) { s390_kernel_write(p, &val, sizeof(val)); } +/* 32-bit immediate for iihf and iilf in bits in I2 field */ static inline void __runtime_fixup_ptr(void *where, unsigned long val) { __runtime_fixup_32(where + 2, val >> 32); @@ -65,6 +79,12 @@ static inline void __runtime_fixup_shift(void *where, unsigned long val) s390_kernel_write(where, &insn, sizeof(insn)); } +/* 32-bit immediate for nilf in bits in I2 field */ +static inline void __runtime_fixup_mask(void *where, unsigned long val) +{ + __runtime_fixup_32(where + 2, val); +} + static inline void runtime_const_fixup(void (*fn)(void *, unsigned long), unsigned long val, s32 *start, s32 *end) { -- 2.34.1