mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 10:14:25 +07:00
54dedb5b57
-----BEGIN PGP SIGNATURE-----
iHUEABYIAB0WIQRTLbB6QfY48x44uB6AXGG7T9hjvgUCXlAvJgAKCRCAXGG7T9hj
voVrAPsEsWQB5qtd+mWJCzE8VeR+mZ5SzQwJ12FhDA+4wUFuHgEAofvP7t8H3Bkr
SrSGMB2hHlJW78ZLoSSpnhAWm4nANg8=
=skec
-----END PGP SIGNATURE-----
Merge tag 'for-linus-5.6-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
"Two small fixes for Xen:
- a fix to avoid warnings with new gcc
- a fix for incorrectly disabled interrupts when calling
_cond_resched()"
* tag 'for-linus-5.6-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: Enable interrupts when calling _cond_resched()
x86/xen: Distribute switch variables for initialization
43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Preemptible hypercalls
|
|
*
|
|
* Copyright (C) 2014 Citrix Systems R&D ltd.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <xen/xen-ops.h>
|
|
|
|
#ifndef CONFIG_PREEMPTION
|
|
|
|
/*
|
|
* 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);
|
|
local_irq_enable();
|
|
cond_resched();
|
|
local_irq_disable();
|
|
__this_cpu_write(xen_in_preemptible_hcall, true);
|
|
}
|
|
}
|
|
#endif /* CONFIG_PREEMPTION */
|