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