/* * 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 */ cket-loop-back'>packet-loop-back</option> <option value='packet-rx-pump-back'>packet-rx-pump-back</option> </select> <input type='submit' value='switch'/></form></td></tr> <tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table> <table class='tabs'><tr><td> <a href='/cgit.cgi/linux/net-next.git/'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/include/scsi/iscsi_if.h?showmsg=1'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/include/scsi/iscsi_if.h?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/include/scsi/iscsi_if.h?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include/scsi/iscsi_if.h?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/scsi/iscsi_if.h'> <input type='hidden' name='id' value='6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25'/><input type='hidden' name='showmsg' value='1'/><select name='qt'> <option value='grep'>log msg</option> <option value='author'>author</option> <option value='committer'>committer</option> <option value='range'>range</option> </select> <input class='txt' type='search' size='10' name='q' value=''/> <input type='submit' value='search'/> </form> </td></tr></table> <div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25&showmsg=1'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25&showmsg=1'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/scsi?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25&showmsg=1'>scsi</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/scsi/iscsi_if.h?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25&showmsg=1'>iscsi_if.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/scsi/iscsi_if.h?id=6d9f66ac7fec2a6ccd649e5909806dfe36f1fc25'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>