/* SPDX-License-Identifier: GPL-2.0 */ // // Code shared between 32 and 64 bit #include <asm/spec-ctrl.h> void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p); /* * This needs to be inline to optimize for the common case where no extra * work needs to be done. */ static inline void switch_to_extra(struct task_struct *prev, struct task_struct *next) { unsigned long next_tif = task_thread_info(next)->flags; unsigned long prev_tif = task_thread_info(prev)->flags; if (IS_ENABLED(CONFIG_SMP)) { /* * Avoid __switch_to_xtra() invocation when conditional * STIBP is disabled and the only different bit is * TIF_SPEC_IB. For CONFIG_SMP=n TIF_SPEC_IB is not * in the TIF_WORK_CTXSW masks. */ if (!static_branch_likely(&switch_to_cond_stibp)) { prev_tif &= ~_TIF_SPEC_IB; next_tif &= ~_TIF_SPEC_IB; } } /* * __switch_to_xtra() handles debug registers, i/o bitmaps, * speculation mitigations etc. */ if (unlikely(next_tif & _TIF_WORK_CTXSW_NEXT || prev_tif & _TIF_WORK_CTXSW_PREV)) __switch_to_xtra(prev, next); }