/****************************************************************************** * nmi.h * * NMI callback registration and reason codes. * * Copyright (c) 2005, Keir Fraser */ #ifndef __XEN_PUBLIC_NMI_H__ #define __XEN_PUBLIC_NMI_H__ #include /* * NMI reason codes: * Currently these are x86-specific, stored in arch_shared_info.nmi_reason. */ /* I/O-check error reported via ISA port 0x61, bit 6. */ #define _XEN_NMIREASON_io_error 0 #define XEN_NMIREASON_io_error (1UL << _XEN_NMIREASON_io_error) /* PCI SERR reported via ISA port 0x61, bit 7. */ #define _XEN_NMIREASON_pci_serr 1 #define XEN_NMIREASON_pci_serr (1UL << _XEN_NMIREASON_pci_serr) /* Unknown hardware-generated NMI. */ #define _XEN_NMIREASON_unknown 2 #define XEN_NMIREASON_unknown (1UL << _XEN_NMIREASON_unknown) /* * long nmi_op(unsigned int cmd, void *arg) * NB. All ops return zero on success, else a negative error code. */ /* * Register NMI callback for this (calling) VCPU. Currently this only makes * sense for domain 0, vcpu 0. All other callers will be returned EINVAL. * arg == pointer to xennmi_callback structure. */ #define XENNMI_register_callback 0 struct xennmi_callback { unsigned long handler_address; unsigned long pad; }; DEFINE_GUEST_HANDLE_STRUCT(xennmi_callback); /* * Deregister NMI callback for this (calling) VCPU. * arg == NULL. */ #define XENNMI_unregister_callback 1 #endif /* __XEN_PUBLIC_NMI_H__ */ b right'>Tobias Klauser
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authorAndrei Vagin <avagin@openvz.org>2017-01-04 19:28:14 -0800
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:56 +1300
commitadd7c65ca426b7a37184dd3d2172394e23d585d6 (patch)
tree28b08b519540041b06ed0ab0b1c005076b932e8e /net/sched/sch_codel.c
parent75422726b0f717d67db3283c2eb5bc14fa2619c5 (diff)
pid: fix lockdep deadlock warning due to ucount_lock
========================================================= [ INFO: possible irq lock inversion dependency detected ] 4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G W --------------------------------------------------------- swapper/1/0 just changed the state of lock: (&(&sighand->siglock)->rlock){-.....}, at: [<ffffffffbd0a1bc6>] __lock_task_sighand+0xb6/0x2c0 but this lock took another, HARDIRQ-unsafe lock in the past: (ucounts_lock){+.+...} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &(&sighand->siglock)->rlock --> &(&tty->ctrl_lock)->rlock --> ucounts_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ucounts_lock); local_irq_disable(); lock(&(&sighand->siglock)->rlock); lock(&(&tty->ctrl_lock)->rlock); <Interrupt> lock(&(&sighand->siglock)->rlock); *** DEADLOCK *** This patch removes a dependency between rlock and ucount_lock. Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces") Cc: stable@vger.kernel.org Signed-off-by: Andrei Vagin <avagin@openvz.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'net/sched/sch_codel.c')