/*
 * 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 */
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<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=2ad5d52d42810bed95100a3d912679d8864421ec'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools?id=2ad5d52d42810bed95100a3d912679d8864421ec'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing?id=2ad5d52d42810bed95100a3d912679d8864421ec'>testing</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests?id=2ad5d52d42810bed95100a3d912679d8864421ec'>selftests</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture?id=2ad5d52d42810bed95100a3d912679d8864421ec'>rcutorture</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture/configs?id=2ad5d52d42810bed95100a3d912679d8864421ec'>configs</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture/configs/rcu?id=2ad5d52d42810bed95100a3d912679d8864421ec'>rcu</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture/configs/rcu/TREE07?id=2ad5d52d42810bed95100a3d912679d8864421ec'>TREE07</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='2ad5d52d42810bed95100a3d912679d8864421ec'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Helge Deller &lt;deller@gmx.de&gt;</td><td class='right'>2017-01-28 11:52:02 +0100</td></tr>
<tr><th>committer</th><td>Helge Deller &lt;deller@gmx.de&gt;</td><td class='right'>2017-01-28 21:54:23 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture/configs/rcu/TREE07?id=2ad5d52d42810bed95100a3d912679d8864421ec'>2ad5d52d42810bed95100a3d912679d8864421ec</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/testing/selftests/rcutorture/configs/rcu/TREE07?id=2ad5d52d42810bed95100a3d912679d8864421ec'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/rcutorture/configs/rcu/TREE07?id=83b5d1e3d3013dbf90645a5d07179d018c8243fa'>83b5d1e3d3013dbf90645a5d07179d018c8243fa</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/rcutorture/configs/rcu/TREE07?id=2ad5d52d42810bed95100a3d912679d8864421ec&amp;id2=83b5d1e3d3013dbf90645a5d07179d018c8243fa'>diff</a>)</td></tr></table>
<div class='commit-subject'>parisc: Don't use BITS_PER_LONG in userspace-exported swab.h header</div><div class='commit-msg'>In swab.h the "#if BITS_PER_LONG &gt; 32" breaks compiling userspace programs if
BITS_PER_LONG is #defined by userspace with the sizeof() compiler builtin.

Solve this problem by using __BITS_PER_LONG instead.  Since we now
#include asm/bitsperlong.h avoid further potential userspace pollution
by moving the #define of SHIFT_PER_LONG to bitops.h which is not
exported to userspace.

This patch unbreaks compiling qemu on hppa/parisc.

Signed-off-by: Helge Deller &lt;deller@gmx.de&gt;
Cc: &lt;stable@vger.kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=2ad5d52d42810bed95100a3d912679d8864421ec'>Diffstat</a> (limited to 'tools/testing/selftests/rcutorture/configs/rcu/TREE07')</div><table summary='diffstat' class='diffstat'>