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Diffstat (limited to 'drivers/xen/preempt.c')
| -rw-r--r-- | drivers/xen/preempt.c | 44 |
1 files changed, 0 insertions, 44 deletions
diff --git a/drivers/xen/preempt.c b/drivers/xen/preempt.c deleted file mode 100644 index 08cb419eb4e6..000000000000 --- a/drivers/xen/preempt.c +++ /dev/null @@ -1,44 +0,0 @@ -/* - * Preemptible hypercalls - * - * Copyright (C) 2014 Citrix Systems R&D ltd. - * - * This source code is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or (at your option) any later version. - */ - -#include <linux/sched.h> -#include <xen/xen-ops.h> - -#ifndef CONFIG_PREEMPT - -/* - * Some hypercalls issued by the toolstack can take many 10s of - * seconds. Allow tasks running hypercalls via the privcmd driver to - * be voluntarily preempted even if full kernel preemption is - * disabled. - * - * Such preemptible hypercalls are bracketed by - * xen_preemptible_hcall_begin() and xen_preemptible_hcall_end() - * calls. - */ - -DEFINE_PER_CPU(bool, xen_in_preemptible_hcall); -EXPORT_SYMBOL_GPL(xen_in_preemptible_hcall); - -asmlinkage __visible void xen_maybe_preempt_hcall(void) -{ - if (unlikely(__this_cpu_read(xen_in_preemptible_hcall) - && need_resched())) { - /* - * Clear flag as we may be rescheduled on a different - * cpu. - */ - __this_cpu_write(xen_in_preemptible_hcall, false); - _cond_resched(); - __this_cpu_write(xen_in_preemptible_hcall, true); - } -} -#endif /* CONFIG_PREEMPT */ |