1*b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 29f97da78SDavid Howells #ifndef __ASM_ARM_SWITCH_TO_H 39f97da78SDavid Howells #define __ASM_ARM_SWITCH_TO_H 49f97da78SDavid Howells 59f97da78SDavid Howells #include <linux/thread_info.h> 69f97da78SDavid Howells 79f97da78SDavid Howells /* 873a6fdc4SWill Deacon * For v7 SMP cores running a preemptible kernel we may be pre-empted 973a6fdc4SWill Deacon * during a TLB maintenance operation, so execute an inner-shareable dsb 1073a6fdc4SWill Deacon * to ensure that the maintenance completes in case we migrate to another 1173a6fdc4SWill Deacon * CPU. 1273a6fdc4SWill Deacon */ 1373a6fdc4SWill Deacon #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7) 147baa7aecSWill Deacon #define __complete_pending_tlbi() dsb(ish) 157baa7aecSWill Deacon #else 167baa7aecSWill Deacon #define __complete_pending_tlbi() 1773a6fdc4SWill Deacon #endif 1873a6fdc4SWill Deacon 1973a6fdc4SWill Deacon /* 209f97da78SDavid Howells * switch_to(prev, next) should switch from task `prev' to `next' 219f97da78SDavid Howells * `prev' will never be the same as `next'. schedule() itself 229f97da78SDavid Howells * contains the memory barrier to tell GCC not to cache `current'. 239f97da78SDavid Howells */ 249f97da78SDavid Howells extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *); 259f97da78SDavid Howells 269f97da78SDavid Howells #define switch_to(prev,next,last) \ 279f97da78SDavid Howells do { \ 287baa7aecSWill Deacon __complete_pending_tlbi(); \ 299f97da78SDavid Howells last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ 309f97da78SDavid Howells } while (0) 319f97da78SDavid Howells 329f97da78SDavid Howells #endif /* __ASM_ARM_SWITCH_TO_H */ 33