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path: root/include/trace/events/context_tracking.h
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#undef TRACE_SYSTEM
#define TRACE_SYSTEM context_tracking

#if !defined(_TRACE_CONTEXT_TRACKING_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_CONTEXT_TRACKING_H

#include <linux/tracepoint.h>

DECLARE_EVENT_CLASS(context_tracking_user,

	TP_PROTO(int dummy),

	TP_ARGS(dummy),

	TP_STRUCT__entry(
		__field( int,	dummy	)
	),

	TP_fast_assign(
		__entry->dummy		= dummy;
	),

	TP_printk("%s", "")
);

/**
 * user_enter - called when the kernel resumes to userspace
 * @dummy:	dummy arg to make trace event macro happy
 *
 * This event occurs when the kernel resumes to userspace  after
 * an exception or a syscall.
 */
DEFINE_EVENT(context_tracking_user, user_enter,

	TP_PROTO(int dummy),

	TP_ARGS(dummy)
);

/**
 * user_exit - called when userspace enters the kernel
 * @dummy:	dummy arg to make trace event macro happy
 *
 * This event occurs when userspace enters the kernel through
 * an exception or a syscall.
 */
DEFINE_EVENT(context_tracking_user, user_exit,

	TP_PROTO(int dummy),

	TP_ARGS(dummy)
);


#endif /*  _TRACE_CONTEXT_TRACKING_H */

/* This part must be outside protection */
#include <trace/define_trace.h>
topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'include/uapi/asm-generic/errno.h')