1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 //
3 // Code shared between 32 and 64 bit
4
5 #include <asm/spec-ctrl.h>
6
7 void __switch_to_xtra(struct task_struct *prev
8
9 /*
10 * This needs to be inline to optimize for the
11 * work needs to be done.
12 */
13 static inline void switch_to_extra(struct task
14 struct task
15 {
16 unsigned long next_tif = read_task_thr
17 unsigned long prev_tif = read_task_thr
18
19 if (IS_ENABLED(CONFIG_SMP)) {
20 /*
21 * Avoid __switch_to_xtra() in
22 * STIBP is disabled and the o
23 * TIF_SPEC_IB. For CONFIG_SMP
24 * in the TIF_WORK_CTXSW masks
25 */
26 if (!static_branch_likely(&swi
27 prev_tif &= ~_TIF_SPEC
28 next_tif &= ~_TIF_SPEC
29 }
30 }
31
32 /*
33 * __switch_to_xtra() handles debug re
34 * speculation mitigations etc.
35 */
36 if (unlikely(next_tif & _TIF_WORK_CTXS
37 prev_tif & _TIF_WORK_CTXS
38 __switch_to_xtra(prev, next);
39 }
40
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